consolidated docs

point to new doc locations
removed non existing dirs
This commit is contained in:
Brian Coca 2016-12-22 13:03:16 -05:00 committed by Brian Coca
parent b139a67c71
commit 57f8b791d6
143 changed files with 4 additions and 9 deletions

15
docs/docsite/.gitignore vendored Normal file
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# Old compiled python stuff
*.py[co]
# package building stuff
build
# Emacs backup files...
*~
.\#*
.doctrees
# Generated docs stuff
ansible*.xml
.buildinfo
objects.inv
.doctrees
rst/modules/*.rst
*.min.css

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docs/docsite/.nojekyll Normal file
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docs/docsite/Makefile Normal file
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SITELIB = $(shell python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")
FORMATTER=../hacking/module_formatter.py
DUMPER=../hacking/dump_playbook_attributes.py
CPUS ?= 1
all: clean docs
docs: clean directives modules staticmin
./build-site.py -j $(CPUS)
-(cp *.ico htmlout/)
-(cp *.jpg htmlout/)
-(cp *.png htmlout/)
variables:
(mkdir -p htmlout/)
dot variables.dot -Tpng -o htmlout/variables.png
viewdocs: clean staticmin
./build-site.py -j $(CPUS) view
htmldocs: staticmin
./build-site.py -j $(CPUS) rst
webdocs: htmldocs
clean:
-rm -rf htmlout
-rm -f .buildinfo
-rm -f *.inv
-rm -rf *.doctrees
@echo "Cleaning up minified css files"
find . -type f -name "*.min.css" -delete
@echo "Cleaning up byte compiled python stuff"
find . -regex ".*\.py[co]$$" -delete
@echo "Cleaning up editor backup files"
find . -type f \( -name "*~" -or -name "#*" \) -delete
find . -type f \( -name "*.swp" \) -delete
@echo "Cleaning up generated rst"
-rm rst/list_of_*.rst
-rm rst/*_by_category.rst
-rm rst/*_module.rst
.PHONEY: docs clean
directives: $(FORMATTER) ../hacking/templates/rst.j2
PYTHONPATH=../lib $(DUMPER) --template-dir=../hacking/templates --output-dir=rst/
modules: $(FORMATTER) ../hacking/templates/rst.j2
PYTHONPATH=../lib $(FORMATTER) -t rst --template-dir=../hacking/templates --module-dir=../lib/ansible/modules -o rst/
staticmin:
cat _themes/srtd/static/css/theme.css | sed -e 's/^[ ]*//g; s/[ ]*$$//g; s/\([:{;,]\) /\1/g; s/ {/{/g; s/\/\*.*\*\///g; /^$$/d' | sed -e :a -e '$$!N; s/\n\(.\)/\1/; ta' > _themes/srtd/static/css/theme.min.css

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docs/docsite/README.md Normal file
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Homepage and documentation source for Ansible
=============================================
This project hosts the source behind [docs.ansible.com](http://docs.ansible.com/)
Contributions to the documentation are welcome. To make changes, submit a pull request
that changes the reStructuredText files in the "rst/" directory only, and the core team can
do a docs build and push the static files.
If you wish to verify output from the markup
such as link references, you may install sphinx and build the documentation by running
`make viewdocs` from the `ansible/docsite` directory.
To include module documentation you'll need to run `make webdocs` at the top level of the repository. The generated
html files are in docsite/htmlout/.
If you do not want to learn the reStructuredText format, you can also [file issues] about
documentation problems on the Ansible GitHub project.
Note that module documentation can actually be [generated from a DOCUMENTATION docstring][module-docs]
in the modules directory, so corrections to modules written as such need to be made
in the module source, rather than in docsite source.
To install sphinx and the required theme, install pip and then "pip install sphinx sphinx_rtd_theme"
[file issues]: https://github.com/ansible/ansible/issues
[module-docs]: http://docs.ansible.com/developing_modules.html#documenting-your-module

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/* Local CSS tweaks for ansible */
.dropdown-menu {
overflow-y: auto;
}
h2 {
padding-top: 40px;
}

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/*
* basic.css
* ~~~~~~~~~
*
* Sphinx stylesheet -- basic theme.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/* -- main layout ----------------------------------------------------------- */
div.clearer {
clear: both;
}
/* -- relbar ---------------------------------------------------------------- */
div.related {
width: 100%;
font-size: 90%;
}
div.related h3 {
display: none;
}
div.related ul {
margin: 0;
padding: 0 0 0 10px;
list-style: none;
}
div.related li {
display: inline;
}
div.related li.right {
float: right;
margin-right: 5px;
}
/* -- sidebar --------------------------------------------------------------- */
div.sphinxsidebarwrapper {
padding: 10px 5px 0 10px;
}
div.sphinxsidebar {
float: left;
width: 230px;
margin-left: -100%;
font-size: 90%;
}
div.sphinxsidebar ul {
list-style: none;
}
div.sphinxsidebar ul ul,
div.sphinxsidebar ul.want-points {
margin-left: 20px;
list-style: square;
}
div.sphinxsidebar ul ul {
margin-top: 0;
margin-bottom: 0;
}
div.sphinxsidebar form {
margin-top: 10px;
}
div.sphinxsidebar input {
border: 1px solid #98dbcc;
font-family: sans-serif;
font-size: 1em;
}
div.sphinxsidebar #searchbox input[type="text"] {
width: 170px;
}
div.sphinxsidebar #searchbox input[type="submit"] {
width: 30px;
}
img {
border: 0;
}
/* -- search page ----------------------------------------------------------- */
ul.search {
margin: 10px 0 0 20px;
padding: 0;
}
ul.search li {
padding: 5px 0 5px 20px;
background-image: url(file.png);
background-repeat: no-repeat;
background-position: 0 7px;
}
ul.search li a {
font-weight: bold;
}
ul.search li div.context {
color: #888;
margin: 2px 0 0 30px;
text-align: left;
}
ul.keywordmatches li.goodmatch a {
font-weight: bold;
}
/* -- index page ------------------------------------------------------------ */
table.contentstable {
width: 90%;
}
table.contentstable p.biglink {
line-height: 150%;
}
a.biglink {
font-size: 1.3em;
}
span.linkdescr {
font-style: italic;
padding-top: 5px;
font-size: 90%;
}
/* -- general index --------------------------------------------------------- */
table.indextable {
width: 100%;
}
table.indextable td {
text-align: left;
vertical-align: top;
}
table.indextable dl, table.indextable dd {
margin-top: 0;
margin-bottom: 0;
}
table.indextable tr.pcap {
height: 10px;
}
table.indextable tr.cap {
margin-top: 10px;
background-color: #f2f2f2;
}
img.toggler {
margin-right: 3px;
margin-top: 3px;
cursor: pointer;
}
div.modindex-jumpbox {
border-top: 1px solid #ddd;
border-bottom: 1px solid #ddd;
margin: 1em 0 1em 0;
padding: 0.4em;
}
div.genindex-jumpbox {
border-top: 1px solid #ddd;
border-bottom: 1px solid #ddd;
margin: 1em 0 1em 0;
padding: 0.4em;
}
/* -- general body styles --------------------------------------------------- */
a.headerlink {
visibility: hidden;
}
h1:hover > a.headerlink,
h2:hover > a.headerlink,
h3:hover > a.headerlink,
h4:hover > a.headerlink,
h5:hover > a.headerlink,
h6:hover > a.headerlink,
dt:hover > a.headerlink {
visibility: visible;
}
div.body p.caption {
text-align: inherit;
}
div.body td {
text-align: left;
}
.field-list ul {
padding-left: 1em;
}
.first {
margin-top: 0 !important;
}
p.rubric {
margin-top: 30px;
font-weight: bold;
}
img.align-left, .figure.align-left, object.align-left {
clear: left;
float: left;
margin-right: 1em;
}
img.align-right, .figure.align-right, object.align-right {
clear: right;
float: right;
margin-left: 1em;
}
img.align-center, .figure.align-center, object.align-center {
display: block;
margin-left: auto;
margin-right: auto;
}
.align-left {
text-align: left;
}
.align-center {
text-align: center;
}
.align-right {
text-align: right;
}
/* -- sidebars -------------------------------------------------------------- */
div.sidebar {
margin: 0 0 0.5em 1em;
border: 1px solid #ddb;
padding: 7px 7px 0 7px;
background-color: #ffe;
width: 40%;
float: right;
}
p.sidebar-title {
font-weight: bold;
}
/* -- topics ---------------------------------------------------------------- */
div.topic {
border: 1px solid #ccc;
padding: 7px 7px 0 7px;
margin: 10px 0 10px 0;
}
p.topic-title {
font-size: 1.1em;
font-weight: bold;
margin-top: 10px;
}
/* -- admonitions ----------------------------------------------------------- */
div.admonition {
margin-top: 10px;
margin-bottom: 10px;
padding: 7px;
}
div.admonition dt {
font-weight: bold;
}
div.admonition dl {
margin-bottom: 0;
}
p.admonition-title {
margin: 0px 10px 5px 0px;
font-weight: bold;
}
div.body p.centered {
text-align: center;
margin-top: 25px;
}
/* -- tables ---------------------------------------------------------------- */
table.docutils {
border: 0;
border-collapse: collapse;
}
table.docutils td, table.docutils th {
padding: 1px 8px 1px 5px;
border-top: 0;
border-left: 0;
border-right: 0;
border-bottom: 1px solid #aaa;
}
table.field-list td, table.field-list th {
border: 0 !important;
}
table.footnote td, table.footnote th {
border: 0 !important;
}
th {
text-align: left;
padding-right: 5px;
}
table.citation {
border-left: solid 1px gray;
margin-left: 1px;
}
table.citation td {
border-bottom: none;
}
/* -- other body styles ----------------------------------------------------- */
ol.arabic {
list-style: decimal;
}
ol.loweralpha {
list-style: lower-alpha;
}
ol.upperalpha {
list-style: upper-alpha;
}
ol.lowerroman {
list-style: lower-roman;
}
ol.upperroman {
list-style: upper-roman;
}
dl {
margin-bottom: 15px;
}
dd p {
margin-top: 0px;
}
dd ul, dd table {
margin-bottom: 10px;
}
dd {
margin-top: 3px;
margin-bottom: 10px;
margin-left: 30px;
}
dt:target, .highlighted {
background-color: #fbe54e;
}
dl.glossary dt {
font-weight: bold;
font-size: 1.1em;
}
.field-list ul {
margin: 0;
padding-left: 1em;
}
.field-list p {
margin: 0;
}
.refcount {
color: #060;
}
.optional {
font-size: 1.3em;
}
.versionmodified {
font-style: italic;
}
.system-message {
background-color: #fda;
padding: 5px;
border: 3px solid red;
}
.footnote:target {
background-color: #ffa;
}
.line-block {
display: block;
margin-top: 1em;
margin-bottom: 1em;
}
.line-block .line-block {
margin-top: 0;
margin-bottom: 0;
margin-left: 1.5em;
}
.guilabel, .menuselection {
font-family: sans-serif;
}
.accelerator {
text-decoration: underline;
}
.classifier {
font-style: oblique;
}
abbr, acronym {
border-bottom: dotted 1px;
cursor: help;
}
/* -- code displays --------------------------------------------------------- */
pre {
overflow: auto;
overflow-y: hidden; /* fixes display issues on Chrome browsers */
}
td.linenos pre {
padding: 5px 0px;
border: 0;
background-color: transparent;
color: #aaa;
}
table.highlighttable {
margin-left: 0.5em;
}
table.highlighttable td {
padding: 0 0.5em 0 0.5em;
}
tt.descname {
background-color: transparent;
font-weight: bold;
font-size: 1.2em;
}
tt.descclassname {
background-color: transparent;
}
tt.xref, a tt {
background-color: transparent;
font-weight: bold;
}
h1 tt, h2 tt, h3 tt, h4 tt, h5 tt, h6 tt {
background-color: transparent;
}
.viewcode-link {
float: right;
}
.viewcode-back {
float: right;
font-family: sans-serif;
}
div.viewcode-block:target {
margin: -1px -10px;
padding: 0 10px;
}
/* -- math display ---------------------------------------------------------- */
img.math {
vertical-align: middle;
}
div.body div.math p {
text-align: center;
}
span.eqno {
float: right;
}
/* -- printout stylesheet --------------------------------------------------- */
@media print {
div.document,
div.documentwrapper,
div.bodywrapper {
margin: 0 !important;
width: 100%;
}
div.sphinxsidebar,
div.related,
div.footer,
#top-link {
display: none;
}
}

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/* ============================================================
* bootstrap-dropdown.js v1.4.0
* http://twitter.github.com/bootstrap/javascript.html#dropdown
* ============================================================
* Copyright 2011 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============================================================ */
!function( $ ){
"use strict"
/* DROPDOWN PLUGIN DEFINITION
* ========================== */
$.fn.dropdown = function ( selector ) {
return this.each(function () {
$(this).delegate(selector || d, 'click', function (e) {
var li = $(this).parent('li')
, isActive = li.hasClass('open')
clearMenus()
!isActive && li.toggleClass('open')
return false
})
})
}
/* APPLY TO STANDARD DROPDOWN ELEMENTS
* =================================== */
var d = 'a.menu, .dropdown-toggle'
function clearMenus() {
$(d).parent('li').removeClass('open')
}
$(function () {
$('html').bind("click", clearMenus)
$('body').dropdown( '[data-dropdown] a.menu, [data-dropdown] .dropdown-toggle' )
})
}( window.jQuery || window.ender );

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/* =============================================================
* bootstrap-scrollspy.js v1.4.0
* http://twitter.github.com/bootstrap/javascript.html#scrollspy
* =============================================================
* Copyright 2011 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============================================================== */
!function ( $ ) {
"use strict"
var $window = $(window)
function ScrollSpy( topbar, selector ) {
var processScroll = $.proxy(this.processScroll, this)
this.$topbar = $(topbar)
this.selector = selector || 'li > a'
this.refresh()
this.$topbar.delegate(this.selector, 'click', processScroll)
$window.scroll(processScroll)
this.processScroll()
}
ScrollSpy.prototype = {
refresh: function () {
this.targets = this.$topbar.find(this.selector).map(function () {
var href = $(this).attr('href')
return /^#\w/.test(href) && $(href).length ? href : null
})
this.offsets = $.map(this.targets, function (id) {
return $(id).offset().top
})
}
, processScroll: function () {
var scrollTop = $window.scrollTop() + 10
, offsets = this.offsets
, targets = this.targets
, activeTarget = this.activeTarget
, i
for (i = offsets.length; i--;) {
activeTarget != targets[i]
&& scrollTop >= offsets[i]
&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
&& this.activateButton( targets[i] )
}
}
, activateButton: function (target) {
this.activeTarget = target
this.$topbar
.find(this.selector).parent('.active')
.removeClass('active')
this.$topbar
.find(this.selector + '[href="' + target + '"]')
.parent('li')
.addClass('active')
}
}
/* SCROLLSPY PLUGIN DEFINITION
* =========================== */
$.fn.scrollSpy = function( options ) {
var scrollspy = this.data('scrollspy')
if (!scrollspy) {
return this.each(function () {
$(this).data('scrollspy', new ScrollSpy( this, options ))
})
}
if ( options === true ) {
return scrollspy
}
if ( typeof options == 'string' ) {
scrollspy[options]()
}
return this
}
$(document).ready(function () {
$('body').scrollSpy('[data-scrollspy] li > a')
})
}( window.jQuery || window.ender );

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/*
* bootstrap-sphinx.css
* ~~~~~~~~~~~~~~~~~~~~
*
* Sphinx stylesheet -- Twitter Bootstrap theme.
*/
body {
padding-top: 42px;
}
div.documentwrapper {
float: left;
width: 100%;
}

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/*
* default.css_t
* ~~~~~~~~~~~~~
*
* Sphinx stylesheet -- default theme.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
@import url("basic.css");
/* -- page layout ----------------------------------------------------------- */
body {
font-family: sans-serif;
font-size: 100%;
background-color: #11303d;
color: #000;
margin: 0;
padding: 0;
}
div.document {
background-color: #1c4e63;
}
div.documentwrapper {
float: left;
width: 100%;
}
div.bodywrapper {
margin: 0 0 0 230px;
}
div.body {
background-color: #ffffff;
color: #000000;
padding: 0 20px 30px 20px;
}
div.footer {
color: #ffffff;
width: 100%;
padding: 9px 0 9px 0;
text-align: center;
font-size: 75%;
}
div.footer a {
color: #ffffff;
text-decoration: underline;
}
div.related {
background-color: #133f52;
line-height: 30px;
color: #ffffff;
}
div.related a {
color: #ffffff;
}
div.sphinxsidebar {
}
div.sphinxsidebar h3 {
font-family: 'Trebuchet MS', sans-serif;
color: #ffffff;
font-size: 1.4em;
font-weight: normal;
margin: 0;
padding: 0;
}
div.sphinxsidebar h3 a {
color: #ffffff;
}
div.sphinxsidebar h4 {
font-family: 'Trebuchet MS', sans-serif;
color: #ffffff;
font-size: 1.3em;
font-weight: normal;
margin: 5px 0 0 0;
padding: 0;
}
div.sphinxsidebar p {
color: #ffffff;
}
div.sphinxsidebar p.topless {
margin: 5px 10px 10px 10px;
}
div.sphinxsidebar ul {
margin: 10px;
padding: 0;
color: #ffffff;
}
div.sphinxsidebar a {
color: #98dbcc;
}
div.sphinxsidebar input {
border: 1px solid #98dbcc;
font-family: sans-serif;
font-size: 1em;
}
/* -- hyperlink styles ------------------------------------------------------ */
a {
color: #355f7c;
text-decoration: none;
}
a:visited {
color: #355f7c;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
/* -- body styles ----------------------------------------------------------- */
div.body h1,
div.body h2,
div.body h3,
div.body h4,
div.body h5,
div.body h6 {
font-family: 'Trebuchet MS', sans-serif;
background-color: #f2f2f2;
font-weight: normal;
color: #20435c;
border-bottom: 1px solid #ccc;
margin: 20px -20px 10px -20px;
padding: 3px 0 3px 10px;
}
div.body h1 { margin-top: 0; font-size: 200%; }
div.body h2 { font-size: 160%; }
div.body h3 { font-size: 140%; }
div.body h4 { font-size: 120%; }
div.body h5 { font-size: 110%; }
div.body h6 { font-size: 100%; }
a.headerlink {
color: #c60f0f;
font-size: 0.8em;
padding: 0 4px 0 4px;
text-decoration: none;
}
a.headerlink:hover {
background-color: #c60f0f;
color: white;
}
div.body p, div.body dd, div.body li {
text-align: justify;
line-height: 130%;
}
div.admonition p.admonition-title + p {
display: inline;
}
div.admonition p {
margin-bottom: 5px;
}
div.admonition pre {
margin-bottom: 5px;
}
div.admonition ul, div.admonition ol {
margin-bottom: 5px;
}
div.note {
background-color: #eee;
border: 1px solid #ccc;
}
div.seealso {
background-color: #ffc;
border: 1px solid #ff6;
}
div.topic {
background-color: #eee;
}
div.warning {
background-color: #ffe4e4;
border: 1px solid #f66;
}
p.admonition-title {
display: inline;
}
p.admonition-title:after {
content: ":";
}
pre {
padding: 5px;
background-color: #eeffcc;
color: #333333;
line-height: 120%;
border: 1px solid #ac9;
border-left: none;
border-right: none;
}
tt {
background-color: #ecf0f3;
padding: 0 1px 0 1px;
font-size: 0.95em;
}
th {
background-color: #ede;
}
.warning tt {
background: #efc2c2;
}
.note tt {
background: #d6d6d6;
}
.viewcode-back {
font-family: sans-serif;
}
div.viewcode-block:target {
background-color: #f4debf;
border-top: 1px solid #ac9;
border-bottom: 1px solid #ac9;
}

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/*
* doctools.js
* ~~~~~~~~~~~
*
* Sphinx JavaScript utilities for all documentation.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/**
* select a different prefix for underscore
*/
$u = _.noConflict();
/**
* make the code below compatible with browsers without
* an installed firebug like debugger
if (!window.console || !console.firebug) {
var names = ["log", "debug", "info", "warn", "error", "assert", "dir",
"dirxml", "group", "groupEnd", "time", "timeEnd", "count", "trace",
"profile", "profileEnd"];
window.console = {};
for (var i = 0; i < names.length; ++i)
window.console[names[i]] = function() {};
}
*/
/**
* small helper function to urldecode strings
*/
jQuery.urldecode = function(x) {
return decodeURIComponent(x).replace(/\+/g, ' ');
}
/**
* small helper function to urlencode strings
*/
jQuery.urlencode = encodeURIComponent;
/**
* This function returns the parsed url parameters of the
* current request. Multiple values per key are supported,
* it will always return arrays of strings for the value parts.
*/
jQuery.getQueryParameters = function(s) {
if (typeof s == 'undefined')
s = document.location.search;
var parts = s.substr(s.indexOf('?') + 1).split('&');
var result = {};
for (var i = 0; i < parts.length; i++) {
var tmp = parts[i].split('=', 2);
var key = jQuery.urldecode(tmp[0]);
var value = jQuery.urldecode(tmp[1]);
if (key in result)
result[key].push(value);
else
result[key] = [value];
}
return result;
};
/**
* small function to check if an array contains
* a given item.
*/
jQuery.contains = function(arr, item) {
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initIndexTable : function() {
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},
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hideSearchWords : function() {
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},
/**
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makeURL : function(relativeURL) {
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},
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getCurrentURL : function() {
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parts.pop();
});
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};
// quick alias for translations
_ = Documentation.gettext;
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* Includes Sizzle.js
* http://sizzlejs.com/
* Copyright 2010, The Dojo Foundation
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*
* Date: Sat Feb 13 22:33:48 2010 -0500
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.highlight .gt { color: #0040D0 } /* Generic.Traceback */
.highlight .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
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/*
* searchtools.js_t
* ~~~~~~~~~~~~~~~~
*
* Sphinx JavaScript utilities for the full-text search.
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
/**
* helper function to return a node containing the
* search summary for a given text. keywords is a list
* of stemmed words, hlwords is the list of normal, unstemmed
* words. the first one is used to find the occurrence, the
* latter for highlighting it.
*/
jQuery.makeSearchSummary = function(text, keywords, hlwords) {
var textLower = text.toLowerCase();
var start = 0;
$.each(keywords, function() {
var i = textLower.indexOf(this.toLowerCase());
if (i > -1)
start = i;
});
start = Math.max(start - 120, 0);
var excerpt = ((start > 0) ? '...' : '') +
$.trim(text.substr(start, 240)) +
((start + 240 - text.length) ? '...' : '');
var rv = $('<div class="context"></div>').text(excerpt);
$.each(hlwords, function() {
rv = rv.highlightText(this, 'highlighted');
});
return rv;
}
/**
* Porter Stemmer
*/
var Stemmer = function() {
var step2list = {
ational: 'ate',
tional: 'tion',
enci: 'ence',
anci: 'ance',
izer: 'ize',
bli: 'ble',
alli: 'al',
entli: 'ent',
eli: 'e',
ousli: 'ous',
ization: 'ize',
ation: 'ate',
ator: 'ate',
alism: 'al',
iveness: 'ive',
fulness: 'ful',
ousness: 'ous',
aliti: 'al',
iviti: 'ive',
biliti: 'ble',
logi: 'log'
};
var step3list = {
icate: 'ic',
ative: '',
alize: 'al',
iciti: 'ic',
ical: 'ic',
ful: '',
ness: ''
};
var c = "[^aeiou]"; // consonant
var v = "[aeiouy]"; // vowel
var C = c + "[^aeiouy]*"; // consonant sequence
var V = v + "[aeiou]*"; // vowel sequence
var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0
var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1
var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1
var s_v = "^(" + C + ")?" + v; // vowel in stem
this.stemWord = function (w) {
var stem;
var suffix;
var firstch;
var origword = w;
if (w.length < 3)
return w;
var re;
var re2;
var re3;
var re4;
firstch = w.substr(0,1);
if (firstch == "y")
w = firstch.toUpperCase() + w.substr(1);
// Step 1a
re = /^(.+?)(ss|i)es$/;
re2 = /^(.+?)([^s])s$/;
if (re.test(w))
w = w.replace(re,"$1$2");
else if (re2.test(w))
w = w.replace(re2,"$1$2");
// Step 1b
re = /^(.+?)eed$/;
re2 = /^(.+?)(ed|ing)$/;
if (re.test(w)) {
var fp = re.exec(w);
re = new RegExp(mgr0);
if (re.test(fp[1])) {
re = /.$/;
w = w.replace(re,"");
}
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1];
re2 = new RegExp(s_v);
if (re2.test(stem)) {
w = stem;
re2 = /(at|bl|iz)$/;
re3 = new RegExp("([^aeiouylsz])\\1$");
re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re2.test(w))
w = w + "e";
else if (re3.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
else if (re4.test(w))
w = w + "e";
}
}
// Step 1c
re = /^(.+?)y$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(s_v);
if (re.test(stem))
w = stem + "i";
}
// Step 2
re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step2list[suffix];
}
// Step 3
re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step3list[suffix];
}
// Step 4
re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
re2 = /^(.+?)(s|t)(ion)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
if (re.test(stem))
w = stem;
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1] + fp[2];
re2 = new RegExp(mgr1);
if (re2.test(stem))
w = stem;
}
// Step 5
re = /^(.+?)e$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
re2 = new RegExp(meq1);
re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
w = stem;
}
re = /ll$/;
re2 = new RegExp(mgr1);
if (re.test(w) && re2.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
// and turn initial Y back to y
if (firstch == "y")
w = firstch.toLowerCase() + w.substr(1);
return w;
}
}
/**
* Search Module
*/
var Search = {
_index : null,
_queued_query : null,
_pulse_status : -1,
init : function() {
var params = $.getQueryParameters();
if (params.q) {
var query = params.q[0];
$('input[name="q"]')[0].value = query;
this.performSearch(query);
}
},
loadIndex : function(url) {
$.ajax({type: "GET", url: url, data: null, success: null,
dataType: "script", cache: true});
},
setIndex : function(index) {
var q;
this._index = index;
if ((q = this._queued_query) !== null) {
this._queued_query = null;
Search.query(q);
}
},
hasIndex : function() {
return this._index !== null;
},
deferQuery : function(query) {
this._queued_query = query;
},
stopPulse : function() {
this._pulse_status = 0;
},
startPulse : function() {
if (this._pulse_status >= 0)
return;
function pulse() {
Search._pulse_status = (Search._pulse_status + 1) % 4;
var dotString = '';
for (var i = 0; i < Search._pulse_status; i++)
dotString += '.';
Search.dots.text(dotString);
if (Search._pulse_status > -1)
window.setTimeout(pulse, 500);
};
pulse();
},
/**
* perform a search for something
*/
performSearch : function(query) {
// create the required interface elements
this.out = $('#search-results');
this.title = $('<h2>' + _('Searching') + '</h2>').appendTo(this.out);
this.dots = $('<span></span>').appendTo(this.title);
this.status = $('<p style="display: none"></p>').appendTo(this.out);
this.output = $('<ul class="search"/>').appendTo(this.out);
$('#search-progress').text(_('Preparing search...'));
this.startPulse();
// index already loaded, the browser was quick!
if (this.hasIndex())
this.query(query);
else
this.deferQuery(query);
},
query : function(query) {
var stopwords = ["and","then","into","it","as","are","in","if","for","no","there","their","was","is","be","to","that","but","they","not","such","with","by","a","on","these","of","will","this","near","the","or","at"];
// Stem the searchterms and add them to the correct list
var stemmer = new Stemmer();
var searchterms = [];
var excluded = [];
var hlterms = [];
var tmp = query.split(/\s+/);
var objectterms = [];
for (var i = 0; i < tmp.length; i++) {
if (tmp[i] != "") {
objectterms.push(tmp[i].toLowerCase());
}
if ($u.indexOf(stopwords, tmp[i]) != -1 || tmp[i].match(/^\d+$/) ||
tmp[i] == "") {
// skip this "word"
continue;
}
// stem the word
var word = stemmer.stemWord(tmp[i]).toLowerCase();
// select the correct list
if (word[0] == '-') {
var toAppend = excluded;
word = word.substr(1);
}
else {
var toAppend = searchterms;
hlterms.push(tmp[i].toLowerCase());
}
// only add if not already in the list
if (!$.contains(toAppend, word))
toAppend.push(word);
};
var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" "));
// console.debug('SEARCH: searching for:');
// console.info('required: ', searchterms);
// console.info('excluded: ', excluded);
// prepare search
var filenames = this._index.filenames;
var titles = this._index.titles;
var terms = this._index.terms;
var fileMap = {};
var files = null;
// different result priorities
var importantResults = [];
var objectResults = [];
var regularResults = [];
var unimportantResults = [];
$('#search-progress').empty();
// lookup as object
for (var i = 0; i < objectterms.length; i++) {
var others = [].concat(objectterms.slice(0,i),
objectterms.slice(i+1, objectterms.length))
var results = this.performObjectSearch(objectterms[i], others);
// Assume first word is most likely to be the object,
// other words more likely to be in description.
// Therefore put matches for earlier words first.
// (Results are eventually used in reverse order).
objectResults = results[0].concat(objectResults);
importantResults = results[1].concat(importantResults);
unimportantResults = results[2].concat(unimportantResults);
}
// perform the search on the required terms
for (var i = 0; i < searchterms.length; i++) {
var word = searchterms[i];
// no match but word was a required one
if ((files = terms[word]) == null)
break;
if (files.length == undefined) {
files = [files];
}
// create the mapping
for (var j = 0; j < files.length; j++) {
var file = files[j];
if (file in fileMap)
fileMap[file].push(word);
else
fileMap[file] = [word];
}
}
// now check if the files don't contain excluded terms
for (var file in fileMap) {
var valid = true;
// check if all requirements are matched
if (fileMap[file].length != searchterms.length)
continue;
// ensure that none of the excluded terms is in the
// search result.
for (var i = 0; i < excluded.length; i++) {
if (terms[excluded[i]] == file ||
$.contains(terms[excluded[i]] || [], file)) {
valid = false;
break;
}
}
// if we have still a valid result we can add it
// to the result list
if (valid)
regularResults.push([filenames[file], titles[file], '', null]);
}
// delete unused variables in order to not waste
// memory until list is retrieved completely
delete filenames, titles, terms;
// now sort the regular results descending by title
regularResults.sort(function(a, b) {
var left = a[1].toLowerCase();
var right = b[1].toLowerCase();
return (left > right) ? -1 : ((left < right) ? 1 : 0);
});
// combine all results
var results = unimportantResults.concat(regularResults)
.concat(objectResults).concat(importantResults);
// print the results
var resultCount = results.length;
function displayNextItem() {
// results left, load the summary and display it
if (results.length) {
var item = results.pop();
var listItem = $('<li style="display:none"></li>');
if (DOCUMENTATION_OPTIONS.FILE_SUFFIX == '') {
// dirhtml builder
var dirname = item[0] + '/';
if (dirname.match(/\/index\/$/)) {
dirname = dirname.substring(0, dirname.length-6);
} else if (dirname == 'index/') {
dirname = '';
}
listItem.append($('<a/>').attr('href',
DOCUMENTATION_OPTIONS.URL_ROOT + dirname +
highlightstring + item[2]).html(item[1]));
} else {
// normal html builders
listItem.append($('<a/>').attr('href',
item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX +
highlightstring + item[2]).html(item[1]));
}
if (item[3]) {
listItem.append($('<span> (' + item[3] + ')</span>'));
Search.output.append(listItem);
listItem.slideDown(5, function() {
displayNextItem();
});
} else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
$.get(DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' +
item[0] + '.txt', function(data) {
if (data != '') {
listItem.append($.makeSearchSummary(data, searchterms, hlterms));
Search.output.append(listItem);
}
listItem.slideDown(5, function() {
displayNextItem();
});
}, "text");
} else {
// no source available, just display title
Search.output.append(listItem);
listItem.slideDown(5, function() {
displayNextItem();
});
}
}
// search finished, update title and status message
else {
Search.stopPulse();
Search.title.text(_('Search Results'));
if (!resultCount)
Search.status.text(_('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.'));
else
Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount));
Search.status.fadeIn(500);
}
}
displayNextItem();
},
performObjectSearch : function(object, otherterms) {
var filenames = this._index.filenames;
var objects = this._index.objects;
var objnames = this._index.objnames;
var titles = this._index.titles;
var importantResults = [];
var objectResults = [];
var unimportantResults = [];
for (var prefix in objects) {
for (var name in objects[prefix]) {
var fullname = (prefix ? prefix + '.' : '') + name;
if (fullname.toLowerCase().indexOf(object) > -1) {
var match = objects[prefix][name];
var objname = objnames[match[1]][2];
var title = titles[match[0]];
// If more than one term searched for, we require other words to be
// found in the name/title/description
if (otherterms.length > 0) {
var haystack = (prefix + ' ' + name + ' ' +
objname + ' ' + title).toLowerCase();
var allfound = true;
for (var i = 0; i < otherterms.length; i++) {
if (haystack.indexOf(otherterms[i]) == -1) {
allfound = false;
break;
}
}
if (!allfound) {
continue;
}
}
var descr = objname + _(', in ') + title;
anchor = match[3];
if (anchor == '')
anchor = fullname;
else if (anchor == '-')
anchor = objnames[match[1]][1] + '-' + fullname;
result = [filenames[match[0]], fullname, '#'+anchor, descr];
switch (match[2]) {
case 1: objectResults.push(result); break;
case 0: importantResults.push(result); break;
case 2: unimportantResults.push(result); break;
}
}
}
}
// sort results descending
objectResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
importantResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
unimportantResults.sort(function(a, b) {
return (a[1] > b[1]) ? -1 : ((a[1] < b[1]) ? 1 : 0);
});
return [importantResults, objectResults, unimportantResults]
}
}
$(document).ready(function() {
Search.init();
});

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/*
* sidebar.js
* ~~~~~~~~~~
*
* This script makes the Sphinx sidebar collapsible.
*
* .sphinxsidebar contains .sphinxsidebarwrapper. This script adds
* in .sphixsidebar, after .sphinxsidebarwrapper, the #sidebarbutton
* used to collapse and expand the sidebar.
*
* When the sidebar is collapsed the .sphinxsidebarwrapper is hidden
* and the width of the sidebar and the margin-left of the document
* are decreased. When the sidebar is expanded the opposite happens.
* This script saves a per-browser/per-session cookie used to
* remember the position of the sidebar among the pages.
* Once the browser is closed the cookie is deleted and the position
* reset to the default (expanded).
*
* :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
$(function() {
// global elements used by the functions.
// the 'sidebarbutton' element is defined as global after its
// creation, in the add_sidebar_button function
var bodywrapper = $('.bodywrapper');
var sidebar = $('.sphinxsidebar');
var sidebarwrapper = $('.sphinxsidebarwrapper');
// original margin-left of the bodywrapper and width of the sidebar
// with the sidebar expanded
var bw_margin_expanded = bodywrapper.css('margin-left');
var ssb_width_expanded = sidebar.width();
// margin-left of the bodywrapper and width of the sidebar
// with the sidebar collapsed
var bw_margin_collapsed = '.8em';
var ssb_width_collapsed = '.8em';
// colors used by the current theme
var dark_color = $('.related').css('background-color');
var light_color = $('.document').css('background-color');
function sidebar_is_collapsed() {
return sidebarwrapper.is(':not(:visible)');
}
function toggle_sidebar() {
if (sidebar_is_collapsed())
expand_sidebar();
else
collapse_sidebar();
}
function collapse_sidebar() {
sidebarwrapper.hide();
sidebar.css('width', ssb_width_collapsed);
bodywrapper.css('margin-left', bw_margin_collapsed);
sidebarbutton.css({
'margin-left': '0',
'height': bodywrapper.height()
});
sidebarbutton.find('span').text('»');
sidebarbutton.attr('title', _('Expand sidebar'));
document.cookie = 'sidebar=collapsed';
}
function expand_sidebar() {
bodywrapper.css('margin-left', bw_margin_expanded);
sidebar.css('width', ssb_width_expanded);
sidebarwrapper.show();
sidebarbutton.css({
'margin-left': ssb_width_expanded-12,
'height': bodywrapper.height()
});
sidebarbutton.find('span').text('«');
sidebarbutton.attr('title', _('Collapse sidebar'));
document.cookie = 'sidebar=expanded';
}
function add_sidebar_button() {
sidebarwrapper.css({
'float': 'left',
'margin-right': '0',
'width': ssb_width_expanded - 28
});
// create the button
sidebar.append(
'<div id="sidebarbutton"><span>&laquo;</span></div>'
);
var sidebarbutton = $('#sidebarbutton');
light_color = sidebarbutton.css('background-color');
// find the height of the viewport to center the '<<' in the page
var viewport_height;
if (window.innerHeight)
viewport_height = window.innerHeight;
else
viewport_height = $(window).height();
sidebarbutton.find('span').css({
'display': 'block',
'margin-top': (viewport_height - sidebar.position().top - 20) / 2
});
sidebarbutton.click(toggle_sidebar);
sidebarbutton.attr('title', _('Collapse sidebar'));
sidebarbutton.css({
'color': '#FFFFFF',
'border-left': '1px solid ' + dark_color,
'font-size': '1.2em',
'cursor': 'pointer',
'height': bodywrapper.height(),
'padding-top': '1px',
'margin-left': ssb_width_expanded - 12
});
sidebarbutton.hover(
function () {
$(this).css('background-color', dark_color);
},
function () {
$(this).css('background-color', light_color);
}
);
}
function set_position_from_cookie() {
if (!document.cookie)
return;
var items = document.cookie.split(';');
for(var k=0; k<items.length; k++) {
var key_val = items[k].split('=');
var key = key_val[0];
if (key == 'sidebar') {
var value = key_val[1];
if ((value == 'collapsed') && (!sidebar_is_collapsed()))
collapse_sidebar();
else if ((value == 'expanded') && (sidebar_is_collapsed()))
expand_sidebar();
}
}
}
add_sidebar_button();
var sidebarbutton = $('#sidebarbutton');
set_position_from_cookie();
});

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@ -0,0 +1,344 @@
/* solar.css
* Modified from sphinxdoc.css of the sphinxdoc theme.
*/
@import url("basic.css");
/* -- page layout ----------------------------------------------------------- */
body {
font-family: 'Open Sans', sans-serif;
font-size: 14px;
line-height: 150%;
text-align: center;
color: #002b36;
padding: 0;
margin: 0px 80px 0px 80px;
min-width: 740px;
-moz-box-shadow: 0px 0px 10px #93a1a1;
-webkit-box-shadow: 0px 0px 10px #93a1a1;
box-shadow: 0px 0px 10px #93a1a1;
background: url("subtle_dots.png") repeat;
}
div.document {
background-color: #fcfcfc;
text-align: left;
background-repeat: repeat-x;
}
div.bodywrapper {
margin: 0 240px 0 0;
border-right: 1px dotted #eee8d5;
}
div.body {
background-color: white;
margin: 0;
padding: 0.5em 20px 20px 20px;
}
div.related {
font-size: 1em;
background: #002b36;
color: #839496;
padding: 5px 0px;
}
div.related ul {
height: 2em;
margin: 2px;
}
div.related ul li {
margin: 0;
padding: 0;
height: 2em;
float: left;
}
div.related ul li.right {
float: right;
margin-right: 5px;
}
div.related ul li a {
margin: 0;
padding: 2px 5px;
line-height: 2em;
text-decoration: none;
color: #839496;
}
div.related ul li a:hover {
background-color: #073642;
-webkit-border-radius: 2px;
-moz-border-radius: 2px;
border-radius: 2px;
}
div.sphinxsidebarwrapper {
padding: 0;
}
div.sphinxsidebar {
margin: 0;
padding: 0.5em 15px 15px 0;
width: 210px;
float: right;
font-size: 0.9em;
text-align: left;
}
div.sphinxsidebar h3, div.sphinxsidebar h4 {
margin: 1em 0 0.5em 0;
font-size: 1em;
padding: 0.7em;
background-color: #eeeff1;
}
div.sphinxsidebar h3 a {
color: #2E3436;
}
div.sphinxsidebar ul {
padding-left: 1.5em;
margin-top: 7px;
padding: 0;
line-height: 150%;
color: #586e75;
}
div.sphinxsidebar ul ul {
margin-left: 20px;
}
div.sphinxsidebar input {
border: 1px solid #eee8d5;
}
div.footer {
background-color: #93a1a1;
color: #eee;
padding: 3px 8px 3px 0;
clear: both;
font-size: 0.8em;
text-align: right;
}
div.footer a {
color: #eee;
text-decoration: none;
}
/* -- body styles ----------------------------------------------------------- */
p {
margin: 0.8em 0 0.5em 0;
}
div.body a, div.sphinxsidebarwrapper a {
color: #268bd2;
text-decoration: none;
}
div.body a:hover, div.sphinxsidebarwrapper a:hover {
border-bottom: 1px solid #268bd2;
}
h1, h2, h3, h4, h5, h6 {
font-family: "Open Sans", sans-serif;
font-weight: 300;
}
h1 {
margin: 0;
padding: 0.7em 0 0.3em 0;
line-height: 1.2em;
color: #002b36;
text-shadow: #eee 0.1em 0.1em 0.1em;
}
h2 {
margin: 1.3em 0 0.2em 0;
padding: 0 0 10px 0;
color: #073642;
border-bottom: 1px solid #eee;
}
h3 {
margin: 1em 0 -0.3em 0;
padding-bottom: 5px;
}
h3, h4, h5, h6 {
color: #073642;
border-bottom: 1px dotted #eee;
}
div.body h1 a, div.body h2 a, div.body h3 a, div.body h4 a, div.body h5 a, div.body h6 a {
color: #657B83!important;
}
h1 a.anchor, h2 a.anchor, h3 a.anchor, h4 a.anchor, h5 a.anchor, h6 a.anchor {
display: none;
margin: 0 0 0 0.3em;
padding: 0 0.2em 0 0.2em;
color: #aaa!important;
}
h1:hover a.anchor, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor,
h5:hover a.anchor, h6:hover a.anchor {
display: inline;
}
h1 a.anchor:hover, h2 a.anchor:hover, h3 a.anchor:hover, h4 a.anchor:hover,
h5 a.anchor:hover, h6 a.anchor:hover {
color: #777;
background-color: #eee;
}
a.headerlink {
color: #c60f0f!important;
font-size: 1em;
margin-left: 6px;
padding: 0 4px 0 4px;
text-decoration: none!important;
}
a.headerlink:hover {
background-color: #ccc;
color: white!important;
}
cite, code, tt {
font-family: 'Source Code Pro', monospace;
font-size: 0.9em;
letter-spacing: 0.01em;
background-color: #eeeff2;
font-style: normal;
}
hr {
border: 1px solid #eee;
margin: 2em;
}
.highlight {
-webkit-border-radius: 2px;
-moz-border-radius: 2px;
border-radius: 2px;
}
pre {
font-family: 'Source Code Pro', monospace;
font-style: normal;
font-size: 0.9em;
letter-spacing: 0.015em;
line-height: 120%;
padding: 0.7em;
white-space: pre-wrap; /* css-3 */
white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: break-word; /* Internet Explorer 5.5+ */
}
pre a {
color: inherit;
text-decoration: underline;
}
td.linenos pre {
padding: 0.5em 0;
}
div.quotebar {
background-color: #f8f8f8;
max-width: 250px;
float: right;
padding: 2px 7px;
border: 1px solid #ccc;
}
div.topic {
background-color: #f8f8f8;
}
table {
border-collapse: collapse;
margin: 0 -0.5em 0 -0.5em;
}
table td, table th {
padding: 0.2em 0.5em 0.2em 0.5em;
}
div.admonition {
font-size: 0.9em;
margin: 1em 0 1em 0;
border: 1px solid #eee;
background-color: #f7f7f7;
padding: 0;
-moz-box-shadow: 0px 8px 6px -8px #93a1a1;
-webkit-box-shadow: 0px 8px 6px -8px #93a1a1;
box-shadow: 0px 8px 6px -8px #93a1a1;
}
div.admonition p {
margin: 0.5em 1em 0.5em 1em;
padding: 0.2em;
}
div.admonition pre {
margin: 0.4em 1em 0.4em 1em;
}
div.admonition p.admonition-title
{
margin: 0;
padding: 0.2em 0 0.2em 0.6em;
color: white;
border-bottom: 1px solid #eee8d5;
font-weight: bold;
background-color: #268bd2;
}
div.warning p.admonition-title,
div.important p.admonition-title {
background-color: #cb4b16;
}
div.hint p.admonition-title,
div.tip p.admonition-title {
background-color: #859900;
}
div.caution p.admonition-title,
div.attention p.admonition-title,
div.danger p.admonition-title,
div.error p.admonition-title {
background-color: #dc322f;
}
div.admonition ul, div.admonition ol {
margin: 0.1em 0.5em 0.5em 3em;
padding: 0;
}
div.versioninfo {
margin: 1em 0 0 0;
border: 1px solid #eee;
background-color: #DDEAF0;
padding: 8px;
line-height: 1.3em;
font-size: 0.9em;
}
div.viewcode-block:target {
background-color: #f4debf;
border-top: 1px solid #eee;
border-bottom: 1px solid #eee;
}

View file

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/* solarized dark style for solar theme */
/*style pre scrollbar*/
pre::-webkit-scrollbar, .highlight::-webkit-scrollbar {
height: 0.5em;
background: #073642;
}
pre::-webkit-scrollbar-thumb {
border-radius: 1em;
background: #93a1a1;
}
/* pygments style */
.highlight .hll { background-color: #ffffcc }
.highlight { background: #002B36!important; color: #93A1A1 }
.highlight .c { color: #586E75 } /* Comment */
.highlight .err { color: #93A1A1 } /* Error */
.highlight .g { color: #93A1A1 } /* Generic */
.highlight .k { color: #859900 } /* Keyword */
.highlight .l { color: #93A1A1 } /* Literal */
.highlight .n { color: #93A1A1 } /* Name */
.highlight .o { color: #859900 } /* Operator */
.highlight .x { color: #CB4B16 } /* Other */
.highlight .p { color: #93A1A1 } /* Punctuation */
.highlight .cm { color: #586E75 } /* Comment.Multiline */
.highlight .cp { color: #859900 } /* Comment.Preproc */
.highlight .c1 { color: #586E75 } /* Comment.Single */
.highlight .cs { color: #859900 } /* Comment.Special */
.highlight .gd { color: #2AA198 } /* Generic.Deleted */
.highlight .ge { color: #93A1A1; font-style: italic } /* Generic.Emph */
.highlight .gr { color: #DC322F } /* Generic.Error */
.highlight .gh { color: #CB4B16 } /* Generic.Heading */
.highlight .gi { color: #859900 } /* Generic.Inserted */
.highlight .go { color: #93A1A1 } /* Generic.Output */
.highlight .gp { color: #93A1A1 } /* Generic.Prompt */
.highlight .gs { color: #93A1A1; font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #CB4B16 } /* Generic.Subheading */
.highlight .gt { color: #93A1A1 } /* Generic.Traceback */
.highlight .kc { color: #CB4B16 } /* Keyword.Constant */
.highlight .kd { color: #268BD2 } /* Keyword.Declaration */
.highlight .kn { color: #859900 } /* Keyword.Namespace */
.highlight .kp { color: #859900 } /* Keyword.Pseudo */
.highlight .kr { color: #268BD2 } /* Keyword.Reserved */
.highlight .kt { color: #DC322F } /* Keyword.Type */
.highlight .ld { color: #93A1A1 } /* Literal.Date */
.highlight .m { color: #2AA198 } /* Literal.Number */
.highlight .s { color: #2AA198 } /* Literal.String */
.highlight .na { color: #93A1A1 } /* Name.Attribute */
.highlight .nb { color: #B58900 } /* Name.Builtin */
.highlight .nc { color: #268BD2 } /* Name.Class */
.highlight .no { color: #CB4B16 } /* Name.Constant */
.highlight .nd { color: #268BD2 } /* Name.Decorator */
.highlight .ni { color: #CB4B16 } /* Name.Entity */
.highlight .ne { color: #CB4B16 } /* Name.Exception */
.highlight .nf { color: #268BD2 } /* Name.Function */
.highlight .nl { color: #93A1A1 } /* Name.Label */
.highlight .nn { color: #93A1A1 } /* Name.Namespace */
.highlight .nx { color: #93A1A1 } /* Name.Other */
.highlight .py { color: #93A1A1 } /* Name.Property */
.highlight .nt { color: #268BD2 } /* Name.Tag */
.highlight .nv { color: #268BD2 } /* Name.Variable */
.highlight .ow { color: #859900 } /* Operator.Word */
.highlight .w { color: #93A1A1 } /* Text.Whitespace */
.highlight .mf { color: #2AA198 } /* Literal.Number.Float */
.highlight .mh { color: #2AA198 } /* Literal.Number.Hex */
.highlight .mi { color: #2AA198 } /* Literal.Number.Integer */
.highlight .mo { color: #2AA198 } /* Literal.Number.Oct */
.highlight .sb { color: #586E75 } /* Literal.String.Backtick */
.highlight .sc { color: #2AA198 } /* Literal.String.Char */
.highlight .sd { color: #93A1A1 } /* Literal.String.Doc */
.highlight .s2 { color: #2AA198 } /* Literal.String.Double */
.highlight .se { color: #CB4B16 } /* Literal.String.Escape */
.highlight .sh { color: #93A1A1 } /* Literal.String.Heredoc */
.highlight .si { color: #2AA198 } /* Literal.String.Interpol */
.highlight .sx { color: #2AA198 } /* Literal.String.Other */
.highlight .sr { color: #DC322F } /* Literal.String.Regex */
.highlight .s1 { color: #2AA198 } /* Literal.String.Single */
.highlight .ss { color: #2AA198 } /* Literal.String.Symbol */
.highlight .bp { color: #268BD2 } /* Name.Builtin.Pseudo */
.highlight .vc { color: #268BD2 } /* Name.Variable.Class */
.highlight .vg { color: #268BD2 } /* Name.Variable.Global */
.highlight .vi { color: #268BD2 } /* Name.Variable.Instance */
.highlight .il { color: #2AA198 } /* Literal.Number.Integer.Long */

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// Underscore.js 0.5.5
// (c) 2009 Jeremy Ashkenas, DocumentCloud Inc.
// Underscore is freely distributable under the terms of the MIT license.
// Portions of Underscore are inspired by or borrowed from Prototype.js,
// Oliver Steele's Functional, and John Resig's Micro-Templating.
// For all details and documentation:
// http://documentcloud.github.com/underscore/
(function(){var j=this,n=j._,i=function(a){this._wrapped=a},m=typeof StopIteration!=="undefined"?StopIteration:"__break__",b=j._=function(a){return new i(a)};if(typeof exports!=="undefined")exports._=b;var k=Array.prototype.slice,o=Array.prototype.unshift,p=Object.prototype.toString,q=Object.prototype.hasOwnProperty,r=Object.prototype.propertyIsEnumerable;b.VERSION="0.5.5";b.each=function(a,c,d){try{if(a.forEach)a.forEach(c,d);else if(b.isArray(a)||b.isArguments(a))for(var e=0,f=a.length;e<f;e++)c.call(d,
a[e],e,a);else{var g=b.keys(a);f=g.length;for(e=0;e<f;e++)c.call(d,a[g[e]],g[e],a)}}catch(h){if(h!=m)throw h;}return a};b.map=function(a,c,d){if(a&&b.isFunction(a.map))return a.map(c,d);var e=[];b.each(a,function(f,g,h){e.push(c.call(d,f,g,h))});return e};b.reduce=function(a,c,d,e){if(a&&b.isFunction(a.reduce))return a.reduce(b.bind(d,e),c);b.each(a,function(f,g,h){c=d.call(e,c,f,g,h)});return c};b.reduceRight=function(a,c,d,e){if(a&&b.isFunction(a.reduceRight))return a.reduceRight(b.bind(d,e),c);
var f=b.clone(b.toArray(a)).reverse();b.each(f,function(g,h){c=d.call(e,c,g,h,a)});return c};b.detect=function(a,c,d){var e;b.each(a,function(f,g,h){if(c.call(d,f,g,h)){e=f;b.breakLoop()}});return e};b.select=function(a,c,d){if(a&&b.isFunction(a.filter))return a.filter(c,d);var e=[];b.each(a,function(f,g,h){c.call(d,f,g,h)&&e.push(f)});return e};b.reject=function(a,c,d){var e=[];b.each(a,function(f,g,h){!c.call(d,f,g,h)&&e.push(f)});return e};b.all=function(a,c,d){c=c||b.identity;if(a&&b.isFunction(a.every))return a.every(c,
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"""Sphinx ReadTheDocs theme.
From https://github.com/ryan-roemer/sphinx-bootstrap-theme.
"""
import os
VERSION = (0, 1, 5)
__version__ = ".".join(str(v) for v in VERSION)
__version_full__ = __version__
def get_html_theme_path():
"""Return list of HTML theme paths."""
cur_dir = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
return cur_dir

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<ul class="wy-breadcrumbs">
<li><a href="{{ pathto(master_doc) }}">Docs</a> &raquo;</li>
<li><a href="">{{ title }}</a></li>
{% if not pagename.endswith('_module') and (not 'list_of' in pagename) and (not 'category' in pagename) %}
<li class="wy-breadcrumbs-aside">
<a href="https://github.com/ansible/ansible/blob/devel/docsite/rst/{{ pagename }}.rst" class="icon icon-github"> Edit on GitHub</a>
</li>
{% endif %}
</ul>
<hr/>

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<footer>
{% if next or prev %}
<div class="rst-footer-buttons">
{% if next %}
<a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}"/>Next <span class="icon icon-circle-arrow-right"></span></a>
{% endif %}
{% if prev %}
<a href="{{ prev.link|e }}" class="btn btn-neutral" title="{{ prev.title|striptags|e }}"><span class="icon icon-circle-arrow-left"></span> Previous</a>
{% endif %}
</div>
{% endif %}
<hr/>
<script type="text/javascript">
(function(w,d,t,u,n,s,e){w['SwiftypeObject']=n;w[n]=w[n]||function(){
(w[n].q=w[n].q||[]).push(arguments);};s=d.createElement(t);
e=d.getElementsByTagName(t)[0];s.async=1;s.src=u;e.parentNode.insertBefore(s,e);
})(window,document,'script','//s.swiftypecdn.com/install/v2/st.js','_st');
_st('install','yABGvz2N8PwcwBxyfzUc','2.0.0');
</script>
<p>
Copyright © 2016 Red Hat, Inc.
<br>
{%- if last_updated %}
{% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
{%- endif %}
</p>
<p>
Ansible docs are generated from <a href="https://github.com/ansible/ansible">GitHub sources</A> using <A HREF="http://sphinx-doc.org/">Sphinx</A> using a theme provided by <a href="http://readthedocs.org">Read the Docs</a>. {% if pagename.endswith("_module") %}. Module documentation is not edited directly, but is generated from the source code for the modules. To submit an update to module docs, edit the 'DOCUMENTATION' metadata in the <A HREF="https://github.com/ansible/ansible-modules-core">core</A> and <A HREF="https://github.com/ansible/ansible-modules-extras">extras</A> modules source repositories. {% endif %}
</p>
</footer>

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{# TEMPLATE VAR SETTINGS #}
{%- set url_root = pathto('', 1) %}
{%- if url_root == '#' %}{% set url_root = '' %}{% endif %}
{%- if not embedded and docstitle %}
{%- set titlesuffix = " &mdash; "|safe + docstitle|e %}
{%- else %}
{%- set titlesuffix = "" %}
{%- endif %}
<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Google Tag Manager Data Layer -->
<script>
dataLayer = [];
</script>
<!-- End Google Tag Manager Data Layer -->
{% block htmltitle %}
<title>{{ title|striptags|e }}{{ titlesuffix }}</title>
{% endblock %}
{# FAVICON #}
{% if favicon %}
<link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
{% endif %}
{# CSS #}
<link href='https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:400,700|Inconsolata:400,700' rel='stylesheet' type='text/css'>
<link href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.0.3/css/font-awesome.min.css' rel='stylesheet' type='text/css'>
{# JS #}
{% if not embedded %}
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'{{ url_root }}',
VERSION:'{{ release|e }}',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'{{ '' if no_search_suffix else file_suffix }}',
HAS_SOURCE: {{ has_source|lower }}
};
</script>
{%- for scriptfile in script_files %}
<script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
{%- endfor %}
{% if use_opensearch %}
<link rel="search" type="application/opensearchdescription+xml" title="{% trans docstitle=docstitle|e %}Search within {{ docstitle }}{% endtrans %}" href="{{ pathto('_static/opensearch.xml', 1) }}"/>
{% endif %}
{% endif %}
{# RTD hosts these file themselves, so just load on non RTD builds #}
{% if not READTHEDOCS %}
<link rel="stylesheet" href="{{ pathto('_static/' + style, 1) }}" type="text/css" />
<script type="text/javascript" src="_static/js/theme.js"></script>
{% endif %}
{% for cssfile in css_files %}
<link rel="stylesheet" href="{{ pathto(cssfile, 1) }}" type="text/css" />
{% endfor %}
{%- block linktags %}
{%- if hasdoc('about') %}
<link rel="author" title="{{ _('About these documents') }}"
href="{{ pathto('about') }}"/>
{%- endif %}
{%- if hasdoc('genindex') %}
<link rel="index" title="{{ _('Index') }}"
href="{{ pathto('genindex') }}"/>
{%- endif %}
{%- if hasdoc('search') %}
<link rel="search" title="{{ _('Search') }}" href="{{ pathto('search') }}"/>
{%- endif %}
{%- if hasdoc('copyright') %}
<link rel="copyright" title="{{ _('Copyright') }}" href="{{ pathto('copyright') }}"/>
{%- endif %}
<link rel="top" title="{{ docstitle|e }}" href="{{ pathto('index') }}"/>
{%- if parents %}
<link rel="up" title="{{ parents[-1].title|striptags|e }}" href="{{ parents[-1].link|e }}"/>
{%- endif %}
{%- if next %}
<link rel="next" title="{{ next.title|striptags|e }}" href="{{ next.link|e }}"/>
{%- endif %}
{%- if prev %}
<link rel="prev" title="{{ prev.title|striptags|e }}" href="{{ prev.link|e }}"/>
{%- endif %}
{%- endblock %}
{%- block extrahead %} {% endblock %}
<script src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
<style>
.search-reset-start {
color: #463E3F;
float: right;
position: relative;
top: -25px;
left: -10px;
z-index: 10;
}
.search-reset-start:hover {
cursor: pointer;
color: #2980B9;
}
#search-box-id {
padding-right: 25px;
}
</style>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,300'
rel='stylesheet' type='text/css'>
</head>
<body class="wy-body-for-nav">
<!-- Google Tag Manager -->
<noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-PSB293" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-PSB293');</script>
<!-- End Google Tag Manager -->
<div class="DocSite-globalNav ansibleNav">
<ul>
<li><a href="https://www.ansible.com/ansiblefest" target="_blank">AnsibleFest</a></li>
<li><a href="https://www.ansible.com/tower" target="_blank">Products</a></li>
<li><a href="https://www.ansible.com/community" target="_blank">Community</a></li>
<li><a href="https://www.ansible.com/webinars-training" target="_blank">Webinars & Training</a></li>
<li><a href="https://www.ansible.com/blog" target="_blank">Blog</a></li>
</ul>
</div>
<a class="DocSite-nav" href="http://docs.ansible.com/">
<img class="DocSiteNav-logo"
src="{{ pathto('_static/', 1) }}images/logo_invert.png"
alt="Ansible Logo">
<div class="DocSiteNav-title">
Documentation
</div>
</a>
<div class="wy-grid-for-nav">
{# SIDE NAV, TOGGLES ON MOBILE #}
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div style="background-color:#5bbdbf;height=80px;margin:'auto auto auto auto'">
<a class="DocSiteProduct-header DocSiteProduct-header--core"
href="http://docs.ansible.com/ansible/">
<div class="DocSiteProduct-productName">
<div class="DocSiteProduct-logoText">
ANSIBLE
</div>
</div>
</a>
</div>
<div id="menu-id" class="wy-menu wy-menu-vertical" data-spy="affix">
{% set toctree = toctree(maxdepth=2, collapse=False) %}
{% if toctree %}
{{ toctree }}
{% else %}
{{ toc }}
{% endif %}
<div class="DocSite-sideNav ansibleNav">
<ul class="">
<li><a href="https://www.ansible.com/ansiblefest" target="_blank">AnsibleFest</a></li>
<li><a href="https://www.ansible.com/tower" target="_blank">Products</a></li>
<li><a href="https://www.ansible.com/community" target="_blank">Community</a></li>
<li><a href="https://www.ansible.com/webinars-training" target="_blank">Webinars & Training</a></li>
<li><a href="https://www.ansible.com/blog" target="_blank">Blog</a></li>
</ul>
</div>
<!-- changeable widget -->
<div id="sideBanner">
<br/>
<a href="http://www.ansible.com/docs-left?utm_source=docs">
<img style="border-width:0px;" src="https://cdn2.hubspot.net/hubfs/330046/docs-graphics/ASB-docs-left-rail.png" />
</a>
</div>
</div>
&nbsp;
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
{# MOBILE NAV, TRIGGLES SIDE NAV ON TOGGLE #}
<nav class="wy-nav-top">
<i data-toggle="wy-nav-top" class="icon icon-reorder"></i>
<a href="/">{{ project }}</a>
</nav>
{# PAGE CONTENT #}
<div class="wy-nav-content">
<div class="rst-content">
<!-- Banner ads
<div class="DocSiteBanner">
<a class="DocSiteBanner-imgWrapper"
href="http://www.ansible.com/docs-top?utm_source=docs">
<img src="https://cdn2.hubspot.net/hubfs/330046/docs-graphics/ASB-docs-top-left.png">
</a>
<a class="DocSiteBanner-imgWrapper"
href="http://www.ansible.com/docs-top?utm_source=docs">
<img src="https://cdn2.hubspot.net/hubfs/330046/docs-graphics/ASB-docs-top-right.png">
</a>
</div> -->
{% include "breadcrumbs.html" %}
<div id="page-content">
{% block body %}{% endblock %}
</div>
<div id="search-results"><gcse:searchresults-only></div>
{% include "footer.html" %}
</div>
</div>
</section>
</div>
{% include "versions.html" %}
<!-- begin analytics -->
<script type="text/javascript">
var _hsq = _hsq || [];
_hsq.push(["setContentType", "standard-page"]);
(function(d,s,i,r) {
if (d.getElementById(i)){return;}
var n = d.createElement(s),e = document.getElementsByTagName(s)[0];
n.id=i;n.src = '//js.hs-analytics.net/analytics/'+(Math.ceil(new Date()/r)*r)+'/330046.js';
e.parentNode.insertBefore(n, e);
})(document, "script", "hs-analytics",300000);
</script>
<!-- end analytics -->
</body>
</html>

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{#
basic/search.html
~~~~~~~~~~~~~~~~~
Template for the search page.
:copyright: Copyright 2007-2013 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
#}
{%- extends "layout.html" %}
{% set title = _('Search') %}
{% set script_files = script_files + ['_static/searchtools.js'] %}
{% block extrahead %}
<script type="text/javascript">
jQuery(function() { Search.loadIndex("{{ pathto('searchindex.js', 1) }}"); });
</script>
{# this is used when loading the search index using $.ajax fails,
such as on Chrome for documents on localhost #}
<script type="text/javascript" id="searchindexloader"></script>
{{ super() }}
{% endblock %}
{% block body %}
<noscript>
<div id="fallback" class="admonition warning">
<p class="last">
{% trans %}Please activate JavaScript to enable the search
functionality.{% endtrans %}
</p>
</div>
</noscript>
{% if search_performed %}
<h2>{{ _('Search Results') }}</h2>
{% if not search_results %}
<p>{{ _('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.') }}</p>
{% endif %}
{% endif %}
<div id="search-results">
{% if search_results %}
<ul>
{% for href, caption, context in search_results %}
<li>
<a href="{{ pathto(item.href) }}">{{ caption }}</a>
<p class="context">{{ context|e }}</p>
</li>
{% endfor %}
</ul>
{% endif %}
</div>
{% endblock %}

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});
$("[data-toggle='rst-current-version']").click(function() {
$("[data-toggle='rst-versions']").toggleClass("shift-up");
});
$("table.docutils:not(.field-list").wrap("<div class='wy-table-responsive'></div>");
});

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[theme]
inherit = basic
stylesheet = css/theme.min.css
[options]
typekit_id = hiw1hhg
analytics_id =

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{% if READTHEDOCS %}
{# Add rst-badge after rst-versions for small badge style. #}
<div class="rst-versions" data-toggle="rst-versions">
<span class="rst-current-version" data-toggle="rst-current-version">
<span class="icon icon-book"> Read the Docs</span>
v: {{ current_version }}
<span class="icon icon-caret-down"></span>
</span>
<div class="rst-other-versions">
<dl>
<dt>Versions</dt>
{% for slug, url in versions %}
<dd><a href="{{ url }}">{{ slug }}</a></dd>
{% endfor %}
</dl>
<dl>
<dt>Downloads</dt>
{% for type, url in downloads %}
<dd><a href="{{ url }}">{{ type }}</a></dd>
{% endfor %}
</dl>
<dl>
<dt>On Read the Docs</dt>
<dd>
<a href="//{{ PRODUCTION_DOMAIN }}/projects/{{ slug }}/?fromdocs={{ slug }}">Project Home</a>
</dd>
<dd>
<a href="//{{ PRODUCTION_DOMAIN }}/builds/{{ slug }}/?fromdocs={{ slug }}">Builds</a>
</dd>
</dl>
<hr/>
Free document hosting provided by <a href="http://www.readthedocs.org">Read the Docs</a>.
</div>
</div>
{% endif %}

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#!/usr/bin/env python
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of the Ansible Documentation
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
__docformat__ = 'restructuredtext'
import optparse
import os
import sys
import traceback
try:
from sphinx.application import Sphinx
except ImportError:
print("#################################")
print("Dependency missing: Python Sphinx")
print("#################################")
sys.exit(1)
class SphinxBuilder(object):
"""
Creates HTML documentation using Sphinx.
"""
def __init__(self, verbosity=None, parallel=None):
"""
Run the DocCommand.
"""
print("Creating html documentation ...")
try:
buildername = 'html'
outdir = os.path.abspath(os.path.join(os.getcwd(), "htmlout"))
# Create the output directory if it doesn't exist
if not os.access(outdir, os.F_OK):
os.mkdir(outdir)
doctreedir = os.path.join('./', '.doctrees')
confdir = os.path.abspath('./')
srcdir = os.path.abspath('rst')
freshenv = True
# Create the builder
# __init__(self, srcdir, confdir, outdir, doctreedir, buildername, confoverrides=None, status=<open file '<stdout>', mode 'w'>, warning=<open file '<stderr>', mode 'w'>, freshenv=False, warningiserror=False, tags=None, verbosity=0, parallel=0)
app = Sphinx(srcdir,
confdir,
outdir,
doctreedir,
buildername,
confoverrides={},
status=sys.stdout,
warning=sys.stderr,
freshenv=freshenv,
verbosity=verbosity,
parallel=parallel)
app.builder.build_all()
except ImportError:
traceback.print_exc()
except Exception as ex:
print("FAIL! exiting ... (%s)" % ex, file=sys.stderr)
def build_docs(self):
self.app.builder.build_all()
def build_rst_docs(verbosity=None, parallel=None):
verbosity = verbosity or 1
parallel = parallel or 1
SphinxBuilder(verbosity=verbosity,
parallel=parallel)
USAGE = """This script builds the html documentation from rst/asciidoc sources.\n")
Run 'make docs' to build everything.\n
Run 'make viewdocs' to build and then preview in a web browser."""
if __name__ == '__main__':
parser = optparse.OptionParser(USAGE)
parser.add_option('-v','--verbose', dest='verbosity', default=0, action="count",
help="verbose mode (-vvv for more, -vvvv to enable connection debugging)")
parser.add_option('-j', '--parallel', dest='parallel', default="1", action='store',
help="Number of threads to start")
parser.add_option('--view', dest='view',
help="Open a browser after building docs")
options, args = parser.parse_args(sys.argv[:])
build_rst_docs(verbosity=options.verbosity, parallel=int(options.parallel))
if hasattr(options, 'view'):
import webbrowser
if not webbrowser.open('htmlout/index.html'):
print("Could not open on your webbrowser.", file=sys.stderr)

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# -*- coding: utf-8 -*-
#
# documentation build configuration file, created by
# sphinx-quickstart on Sat Sep 27 13:23:22 2008-2009.
#
# This file is execfile()d with the current directory set to its
# containing dir.
#
# The contents of this file are pickled, so don't put values in the namespace
# that aren't pickleable (module imports are okay, they're removed
# automatically).
#
# All configuration values have a default value; values that are commented out
# serve to show the default value.
import sys
import os
# pip install sphinx_rtd_theme
#import sphinx_rtd_theme
#html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
# If your extensions are in another directory, add it here. If the directory
# is relative to the documentation root, use os.path.abspath to make it
# absolute, like shown here.
#sys.path.append(os.path.abspath('some/directory'))
#
sys.path.insert(0, os.path.join('ansible', 'lib'))
sys.path.append(os.path.abspath('_themes'))
VERSION='2.2'
AUTHOR='Ansible, Inc'
# General configuration
# ---------------------
# Add any Sphinx extension module names here, as strings.
# They can be extensions
# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
extensions = ['sphinx.ext.autodoc']
# Later on, add 'sphinx.ext.viewcode' to the list if you want to have
# colorized code generated too for references.
# Add any paths that contain templates here, relative to this directory.
templates_path = ['.templates']
# The suffix of source filenames.
source_suffix = '.rst'
# The master toctree document.
master_doc = 'index'
# General substitutions.
project = 'Ansible Documentation'
copyright = "2013-2016 Ansible, Inc"
# The default replacements for |version| and |release|, also used in various
# other places throughout the built documents.
#
# The short X.Y version.
version = VERSION
# The full version, including alpha/beta/rc tags.
release = VERSION
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
#today = ''
# Else, today_fmt is used as the format for a strftime call.
today_fmt = '%B %d, %Y'
# List of documents that shouldn't be included in the build.
#unused_docs = []
# List of directories, relative to source directories, that shouldn't be
# searched for source files.
#exclude_dirs = []
# A list of glob-style patterns that should be excluded when looking
# for source files.
exclude_patterns = ['modules']
# The reST default role (used for this markup: `text`) to use for all
# documents.
#default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
#add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
#add_module_names = True
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
#show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'sphinx'
highlight_language = 'yaml'
#Substitutions, variables, entities, & shortcuts for text which do not need to link to anything.
#For titles which should be a link, use the intersphinx anchors set at the index, chapter, and section levels, such as qi_start_:
rst_epilog = """
.. |acapi| replace:: *Ansible Core API Guide*
.. |acrn| replace:: *Ansible Core Release Notes*
.. |ac| replace:: Ansible Core
.. |acversion| replace:: Ansible Core Version 2.1
.. |acversionshort| replace:: Ansible Core 2.1
.. |versionshortest| replace:: 2.2
.. |versiondev| replace:: 2.3
.. |pubdate| replace:: July 19, 2016
.. |rhel| replace:: Red Hat Enterprise Linux
"""
# Options for HTML output
# -----------------------
html_theme_path = ['_themes']
html_theme = 'srtd'
html_short_title = 'Ansible Documentation'
# The style sheet to use for HTML and HTML Help pages. A file of that name
# must exist either in Sphinx' static/ path, or in one of the custom paths
# given in html_static_path.
#html_style = 'solar.css'
# The name for this set of Sphinx documents. If None, it defaults to
# "<project> v<release> documentation".
html_title = 'Ansible Documentation'
# A shorter title for the navigation bar. Default is the same as html_title.
#html_short_title = None
# The name of an image file (within the static path) to place at the top of
# the sidebar.
#html_logo = None
# The name of an image file (within the static path) to use as favicon of the
# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
#html_favicon = 'favicon.ico'
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
#html_static_path = ['.static']
# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
# using the given strftime format.
html_last_updated_fmt = '%b %d, %Y'
# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
#html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
#html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
#html_additional_pages = {}
# If false, no module index is generated.
#html_use_modindex = True
# If false, no index is generated.
#html_use_index = True
# If true, the index is split into individual pages for each letter.
#html_split_index = False
# If true, the reST sources are included in the HTML build as _sources/<name>.
html_copy_source = False
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
#html_use_opensearch = ''
# If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
#html_file_suffix = ''
# Output file base name for HTML help builder.
htmlhelp_basename = 'Poseidodoc'
# Options for LaTeX output
# ------------------------
# The paper size ('letter' or 'a4').
#latex_paper_size = 'letter'
# The font size ('10pt', '11pt' or '12pt').
#latex_font_size = '10pt'
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title, author, document class
# [howto/manual]).
latex_documents = [
('index', 'ansible.tex', 'Ansible 1.2 Documentation',
AUTHOR, 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
#latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
#latex_use_parts = False
# Additional stuff for the LaTeX preamble.
#latex_preamble = ''
# Documents to append as an appendix to all manuals.
#latex_appendices = []
# If false, no module index is generated.
#latex_use_modindex = True
autoclass_content = 'both'

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angular.module('ansibleApp', []).filter('moduleVersion', function() {
return function(modules, version) {
var parseVersionString = function (str) {
if (typeof(str) != 'string') { return false; }
var x = str.split('.');
// parse from string or default to 0 if can't parse
var maj = parseInt(x[0]) || 0;
var min = parseInt(x[1]) || 0;
var pat = parseInt(x[2]) || 0;
return {
major: maj,
minor: min,
patch: pat
}
}
var vMinMet = function(vmin, vcurrent) {
minimum = parseVersionString(vmin);
running = parseVersionString(vcurrent);
if (running.major != minimum.major)
return (running.major > minimum.major);
else {
if (running.minor != minimum.minor)
return (running.minor > minimum.minor);
else {
if (running.patch != minimum.patch)
return (running.patch > minimum.patch);
else
return true;
}
}
};
var result = [];
if (!version) {
return modules;
}
for (var i = 0; i < modules.length; i++) {
if (vMinMet(modules[i].version_added, version)) {
result[result.length] = modules[i];
}
}
return result;
};
}).filter('uniqueVersion', function() {
return function(modules) {
var result = [];
var inArray = function (needle, haystack) {
var length = haystack.length;
for(var i = 0; i < length; i++) {
if(haystack[i] == needle) return true;
}
return false;
}
var parseVersionString = function (str) {
if (typeof(str) != 'string') { return false; }
var x = str.split('.');
// parse from string or default to 0 if can't parse
var maj = parseInt(x[0]) || 0;
var min = parseInt(x[1]) || 0;
var pat = parseInt(x[2]) || 0;
return {
major: maj,
minor: min,
patch: pat
}
}
for (var i = 0; i < modules.length; i++) {
if (!inArray(modules[i].version_added, result)) {
// Some module do not define version
if (modules[i].version_added) {
result[result.length] = "" + modules[i].version_added;
}
}
}
result.sort(
function (a, b) {
ao = parseVersionString(a);
bo = parseVersionString(b);
if (ao.major == bo.major) {
if (ao.minor == bo.minor) {
if (ao.patch == bo.patch) {
return 0;
}
else {
return (ao.patch > bo.patch) ? 1 : -1;
}
}
else {
return (ao.minor > bo.minor) ? 1 : -1;
}
}
else {
return (ao.major > bo.major) ? 1 : -1;
}
});
return result;
};
});

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@ -0,0 +1,31 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible-playbook</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible-playbook" lang="en"><a id="id474207"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible-playbook — run an ansible playbook</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible-playbook &lt;filename.yml&gt; … [options]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible playbooks</strong></span> are a configuration and multinode deployment
system. Ansible-playbook is the tool used to run them. See the
project home page (link below) for more information.</p></div><div class="refsect1" title="ARGUMENTS"><a id="_arguments"></a><h2>ARGUMENTS</h2><div class="variablelist"><dl><dt><span class="term">
<span class="strong"><strong>filename.yml</strong></span>
</span></dt><dd>
The names of one or more YAML format files to run as ansible playbooks.
</dd></dl></div></div><div class="refsect1" title="OPTIONS"><a id="_options"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">
<span class="strong"><strong>-i</strong></span> <span class="emphasis"><em>PATH</em></span>, <span class="strong"><strong>--inventory=</strong></span><span class="emphasis"><em>PATH</em></span>
</span></dt><dd>
The <span class="emphasis"><em>PATH</em></span> to the inventory hosts file, which defaults to <span class="emphasis"><em>/etc/ansible/hosts</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-M</strong></span> <span class="emphasis"><em>DIRECTORY</em></span>, <span class="strong"><strong>--module-path=</strong></span><span class="emphasis"><em>DIRECTORY</em></span>
</span></dt><dd>
The <span class="emphasis"><em>DIRECTORY</em></span> to load modules from. The default is <span class="emphasis"><em>/usr/share/ansible</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-f</strong></span> <span class="emphasis"><em>NUM</em></span>, <span class="strong"><strong>--forks=</strong></span><span class="emphasis"><em>NUM</em></span>
</span></dt><dd>
Level of parallelism. <span class="emphasis"><em>NUM</em></span> is specified as an integer, the default is 5.
</dd><dt><span class="term">
<span class="strong"><strong>-k</strong></span>, <span class="strong"><strong>--ask-pass</strong></span>
</span></dt><dd>
Prompt for the SSH password instead of assuming key-based authentication with ssh-agent.
</dd><dt><span class="term">
<span class="strong"><strong>-T</strong></span> <span class="emphasis"><em>SECONDS</em></span>, <span class="strong"><strong>--timeout=</strong></span><span class="emphasis"><em>SECONDS</em></span>
</span></dt><dd>
Connection timeout to use when trying to talk to hosts, in <span class="emphasis"><em>SECONDS</em></span>.
</dd></dl></div></div><div class="refsect1" title="ENVIRONMENT"><a id="_environment"></a><h2>ENVIRONMENT</h2><p>The following environment variables may specified.</p><p>ANSIBLE_HOSTS Override the default ansible hosts file</p><p>ANSIBLE_LIBRARYOverride the default ansible module library path</p></div><div class="refsect1" title="AUTHOR"><a id="_author"></a><h2>AUTHOR</h2><p>Ansible was originally written by Michael DeHaan. See the AUTHORS file
for a complete list of contributors.</p></div><div class="refsect1" title="COPYRIGHT"><a id="_copyright"></a><h2>COPYRIGHT</h2><p>Copyright © 2012, Michael DeHaan</p><p>Ansible is released under the terms of the GPLv3 License.</p></div><div class="refsect1" title="SEE ALSO"><a id="_see_also"></a><h2>SEE ALSO</h2><p><span class="strong"><strong>ansible</strong></span>(1)</p><p>Extensive documentation as well as IRC and mailing list info
is available on the ansible home page: <a class="ulink" href="https://ansible.github.com/" target="_top">https://ansible.github.com/</a></p></div></div></body></html>

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible" lang="en"><a id="id392901"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible — run a command somewhere else</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible &lt;host-pattern&gt; [-f forks] [-m module_name] [-a args]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible</strong></span> is an extra-simple tool/framework/API for doing 'remote things' over
SSH.</p></div><div class="refsect1" title="ARGUMENTS"><a id="_arguments"></a><h2>ARGUMENTS</h2><div class="variablelist"><dl><dt><span class="term">
<span class="strong"><strong>host-pattern</strong></span>
</span></dt><dd>
A name of a group in the inventory file, a shell-like glob selecting
hosts in inventory file, or any combination of the two separated by
semicolons.
</dd></dl></div></div><div class="refsect1" title="OPTIONS"><a id="_options"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">
<span class="strong"><strong>-i</strong></span> <span class="emphasis"><em>PATH</em></span>, <span class="strong"><strong>--inventory=</strong></span><span class="emphasis"><em>PATH</em></span>
</span></dt><dd>
The <span class="emphasis"><em>PATH</em></span> to the inventory hosts file, which defaults to <span class="emphasis"><em>/etc/ansible/hosts</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-f</strong></span> <span class="emphasis"><em>NUM</em></span>, <span class="strong"><strong>--forks=</strong></span><span class="emphasis"><em>NUM</em></span>
</span></dt><dd>
Level of parallelism. <span class="emphasis"><em>NUM</em></span> is specified as an integer, the default is 5.
</dd><dt><span class="term">
<span class="strong"><strong>-m</strong></span> <span class="emphasis"><em>NAME</em></span>, <span class="strong"><strong>--module-name=</strong></span><span class="emphasis"><em>NAME</em></span>
</span></dt><dd>
Execute the module called <span class="emphasis"><em>NAME</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-M</strong></span> <span class="emphasis"><em>DIRECTORY</em></span>, <span class="strong"><strong>--module-path=</strong></span><span class="emphasis"><em>DIRECTORY</em></span>
</span></dt><dd>
The <span class="emphasis"><em>DIRECTORY</em></span> to load modules from. The default is <span class="emphasis"><em>/usr/share/ansible</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-a</strong></span> '<span class="emphasis"><em>ARGUMENTS</em></span>', <span class="strong"><strong>--args=</strong></span>'<span class="emphasis"><em>ARGUMENTS</em></span>'
</span></dt><dd>
The <span class="emphasis"><em>ARGUMENTS</em></span> to pass to the module.
</dd><dt><span class="term">
<span class="strong"><strong>-k</strong></span>, <span class="strong"><strong>--ask-pass</strong></span>
</span></dt><dd>
Prompt for the SSH password instead of assuming key-based authentication with ssh-agent.
</dd><dt><span class="term">
<span class="strong"><strong>-o</strong></span>, <span class="strong"><strong>--one-line</strong></span>
</span></dt><dd>
Try to output everything on one line.
</dd><dt><span class="term">
<span class="strong"><strong>-t</strong></span> <span class="emphasis"><em>DIRECTORY</em></span>, <span class="strong"><strong>--tree=</strong></span><span class="emphasis"><em>DIRECTORY</em></span>
</span></dt><dd>
Save contents in this output <span class="emphasis"><em>DIRECTORY</em></span>, with the results saved in a
file named after each host.
</dd><dt><span class="term">
<span class="strong"><strong>-T</strong></span> <span class="emphasis"><em>SECONDS</em></span>, <span class="strong"><strong>--timeout=</strong></span><span class="emphasis"><em>SECONDS</em></span>
</span></dt><dd>
Connection timeout to use when trying to talk to hosts, in <span class="emphasis"><em>SECONDS</em></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-B</strong></span> <span class="emphasis"><em>NUM</em></span>, <span class="strong"><strong>--background=</strong></span><span class="emphasis"><em>NUM</em></span>
</span></dt><dd>
Run commands in the background, killing the task after <span class="emphasis"><em>NUM</em></span> seconds.
</dd><dt><span class="term">
<span class="strong"><strong>-P</strong></span> <span class="emphasis"><em>NUM</em></span>, <span class="strong"><strong>--poll=</strong></span><span class="emphasis"><em>NUM</em></span>
</span></dt><dd>
Poll a background job every <span class="emphasis"><em>NUM</em></span> seconds. Requires <span class="strong"><strong>-B</strong></span>.
</dd><dt><span class="term">
<span class="strong"><strong>-u</strong></span> <span class="emphasis"><em>USERNAME</em></span>, <span class="strong"><strong>--remote-user=</strong></span><span class="emphasis"><em>USERNAME</em></span>
</span></dt><dd>
Use this remote <span class="emphasis"><em>USERNAME</em></span> instead of root.
</dd></dl></div></div><div class="refsect1" title="INVENTORY"><a id="_inventory"></a><h2>INVENTORY</h2><p>Ansible stores the hosts it can potentially operate on in an inventory
file. The syntax is one host per line. Groups headers are allowed and
are included on their own line, enclosed in square brackets.</p></div><div class="refsect1" title="FILES"><a id="_files"></a><h2>FILES</h2><p>/etc/ansible/hostsDefault inventory file</p><p>/usr/share/ansible/Default module library</p></div><div class="refsect1" title="ENVIRONMENT"><a id="_environment"></a><h2>ENVIRONMENT</h2><p>The following environment variables may specified.</p><p>ANSIBLE_HOSTS Override the default ansible hosts file</p><p>ANSIBLE_LIBRARYOverride the default ansible module library path</p></div><div class="refsect1" title="AUTHOR"><a id="_author"></a><h2>AUTHOR</h2><p>Ansible was originally written by Michael DeHaan. See the AUTHORS file
for a complete list of contributors.</p></div><div class="refsect1" title="COPYRIGHT"><a id="_copyright"></a><h2>COPYRIGHT</h2><p>Copyright © 2012, Michael DeHaan</p><p>Ansible is released under the terms of the GPLv3 License.</p></div><div class="refsect1" title="SEE ALSO"><a id="_see_also"></a><h2>SEE ALSO</h2><p><span class="strong"><strong>ansible-playbook</strong></span>(1)</p><p>Extensive documentation as well as IRC and mailing list info
is available on the ansible home page: <a class="ulink" href="https://ansible.github.com/" target="_top">https://ansible.github.com/</a></p></div></div></body></html>

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function AnsibleModules($scope) {
$scope.modules = [];
$scope.orderProp = "module";
}

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YAML Syntax
===========
This page provides a basic overview of correct YAML syntax, which is how Ansible
playbooks (our configuration management language) are expressed.
We use YAML because it is easier for humans to read and write than other common
data formats like XML or JSON. Further, there are libraries available in most
programming languages for working with YAML.
You may also wish to read :doc:`playbooks` at the same time to see how this
is used in practice.
YAML Basics
-----------
For Ansible, nearly every YAML file starts with a list.
Each item in the list is a list of key/value pairs, commonly
called a "hash" or a "dictionary". So, we need to know how
to write lists and dictionaries in YAML.
There's another small quirk to YAML. All YAML files (regardless of their association with Ansible or not) can optionally
begin with ``---`` and end with ``...``. This is part of the YAML format and indicates the start and end of a document.
All members of a list are lines beginning at the same indentation level starting with a ``"- "`` (a dash and a space)::
---
# A list of tasty fruits
fruits:
- Apple
- Orange
- Strawberry
- Mango
...
A dictionary is represented in a simple ``key: value`` form (the colon must be followed by a space)::
# An employee record
martin:
name: Martin D'vloper
job: Developer
skill: Elite
More complicated data structures are possible, such as lists of dictionaries, dictionaries whose values are lists or a mix of both::
# Employee records
- martin:
name: Martin D'vloper
job: Developer
skills:
- python
- perl
- pascal
- tabitha:
name: Tabitha Bitumen
job: Developer
skills:
- lisp
- fortran
- erlang
Dictionaries and lists can also be represented in an abbreviated form if you really want to::
---
martin: {name: Martin D'vloper, job: Developer, skill: Elite}
fruits: ['Apple', 'Orange', 'Strawberry', 'Mango']
.. _truthiness:
Ansible doesn't really use these too much, but you can also specify a boolean value (true/false) in several forms::
create_key: yes
needs_agent: no
knows_oop: True
likes_emacs: TRUE
uses_cvs: false
Values can span multiple lines using ``|`` or ``>``. Spanning multiple lines using a ``|`` will include the newlines. Using a ``>`` will ignore newlines; it's used to make what would otherwise be a very long line easier to read and edit.
In either case the indentation will be ignored.
Examples are::
include_newlines: |
exactly as you see
will appear these three
lines of poetry
ignore_newlines: >
this is really a
single line of text
despite appearances
Let's combine what we learned so far in an arbitrary YAML example.
This really has nothing to do with Ansible, but will give you a feel for the format::
---
# An employee record
name: Martin D'vloper
job: Developer
skill: Elite
employed: True
foods:
- Apple
- Orange
- Strawberry
- Mango
languages:
perl: Elite
python: Elite
pascal: Lame
education: |
4 GCSEs
3 A-Levels
BSc in the Internet of Things
That's all you really need to know about YAML to start writing `Ansible` playbooks.
Gotchas
-------
While YAML is generally friendly, the following is going to result in a YAML syntax error::
foo: somebody said I should put a colon here: so I did
You will want to quote any hash values using colons, like so::
foo: "somebody said I should put a colon here: so I did"
And then the colon will be preserved.
Further, Ansible uses "{{ var }}" for variables. If a value after a colon starts
with a "{", YAML will think it is a dictionary, so you must quote it, like so::
foo: "{{ variable }}"
The same applies for strings that start or contain any YAML special characters ``[] {} : > |`` .
Boolean conversion is helpful, but this can be a problem when you want a literal `yes` or other boolean values as a string.
In these cases just use quotes::
non_boolean: "yes"
other_string: "False"
YAML converts certain strings into floating-point values, such as the string
`1.0`. If you need to specify a version number (in a requirements.yml file, for
example), you will need to quote the value if it looks like a floating-point
value::
version: "1.0"
.. seealso::
:doc:`playbooks`
Learn what playbooks can do and how to write/run them.
`YAMLLint <http://yamllint.com/>`_
YAML Lint (online) helps you debug YAML syntax if you are having problems
`Github examples directory <https://github.com/ansible/ansible-examples>`_
Complete playbook files from the github project source
`Wikipedia YAML syntax reference <https://en.wikipedia.org/wiki/YAML>`_
A good guide to YAML syntax
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Become (Privilege Escalation)
+++++++++++++++++++++++++++++
Ansible can use existing privilege escalation systems to allow a user to execute tasks as another.
.. contents:: Topics
Become
``````
Ansible allows you to 'become' another user, different from the user that logged into the machine (remote user). This is done using existing
privilege escalation tools, which you probably already use or have configured, like `sudo`, `su`, `pfexec`, `doas`, `pbrun`, `dzdo`, `ksu` and others.
.. note:: Before 1.9 Ansible mostly allowed the use of `sudo` and a limited use of `su` to allow a login/remote user to become a different user
and execute tasks, create resources with the 2nd user's permissions. As of 1.9 `become` supersedes the old sudo/su, while still being backwards compatible.
This new system also makes it easier to add other privilege escalation tools like `pbrun` (Powerbroker), `pfexec`, `dzdo` (Centrify), and others.
.. note:: Become vars & directives are independent, i.e. setting `become_user` does not set `become`.
Directives
-----------
These can be set from play to task level, but are overridden by connection variables as they can be host specific.
become
set to 'true'/'yes' to activate privilege escalation.
become_user
set to user with desired privileges — the user you 'become', NOT the user you login as. Does NOT imply `become: yes`, to allow it to be set at host level.
become_method
(at play or task level) overrides the default method set in ansible.cfg, set to `sudo`/`su`/`pbrun`/`pfexec`/`doas`/`dzdo`/`ksu`
become_flags
(at play or task level) permit to use specific flags for the tasks or role. One common use is to change user to nobody when the shell is set to no login. Added in Ansible 2.2.
For example, to manage a system service (which requires ``root`` privileges) when connected as a non-``root`` user (this takes advantage of the fact that the default value of ``become_user`` is ``root``)::
- name: Ensure the httpd service is running
service:
name: httpd
state: started
become: true
To run a command as the ``apache`` user::
- name: Run a command as the apache user
command: somecommand
become: true
become_user: apache
To do something as the ``nobody`` user when the shell is nologin::
- name: Run a command as nobody
command: somecommand
become: true
become_method: su
become_user: nobody
become_flags: '-s /bin/sh'
Connection variables
--------------------
Each allows you to set an option per group and/or host, these are normally defined in inventory but can be used as normal variables.
ansible_become
equivalent of the become directive, decides if privilege escalation is used or not.
ansible_become_method
allows to set privilege escalation method
ansible_become_user
allows to set the user you become through privilege escalation, does not imply `ansible_become: True`
ansible_become_pass
allows you to set the privilege escalation password
For example, if you want to run all tasks as ``root`` on a server named ``webserver``, but you can only connect as the ``manager`` user, you could use an inventory entry like this::
webserver ansible_user=manager ansible_become=true
New command line options
------------------------
--ask-become-pass, -K
ask for privilege escalation password, does not imply become will be used
--become, -b
run operations with become (no password implied)
--become-method=BECOME_METHOD
privilege escalation method to use (default=sudo),
valid choices: [ sudo | su | pbrun | pfexec | doas | dzdo | ksu ]
--become-user=BECOME_USER
run operations as this user (default=root), does not imply --become/-b
For those from Pre 1.9 , sudo and su still work!
------------------------------------------------
For those using old playbooks will not need to be changed, even though they are deprecated, sudo and su directives, variables and options
will continue to work. It is recommended to move to become as they may be retired at one point.
You cannot mix directives on the same object (become and sudo) though, Ansible will complain if you try to.
Become will default to using the old sudo/su configs and variables if they exist, but will override them if you specify any of the new ones.
Limitations
-----------
Although privilege escalation is mostly intuitive, there are a few limitations
on how it works. Users should be aware of these to avoid surprises.
Becoming an Unprivileged User
=============================
Ansible 2.0.x and below has a limitation with regards to becoming an
unprivileged user that can be a security risk if users are not aware of it.
Ansible modules are executed on the remote machine by first substituting the
parameters into the module file, then copying the file to the remote machine,
and finally executing it there.
Everything is fine if the module file is executed without using ``become``,
when the ``become_user`` is root, or when the connection to the remote machine
is made as root. In these cases the module file is created with permissions
that only allow reading by the user and root.
The problem occurs when the ``become_user`` is an unprivileged user. Ansible
2.0.x and below make the module file world readable in this case, as the module
file is written as the user that Ansible connects as, but the file needs to
be readable by the user Ansible is set to ``become``.
.. note:: In Ansible 2.1, this window is further narrowed: If the connection
is made as a privileged user (root), then Ansible 2.1 and above will use
chown to set the file's owner to the unprivileged user being switched to.
This means both the user making the connection and the user being switched
to via ``become`` must be unprivileged in order to trigger this problem.
If any of the parameters passed to the module are sensitive in nature, then
those pieces of data are located in a world readable module file for the
duration of the Ansible module execution. Once the module is done executing,
Ansible will delete the temporary file. If you trust the client machines then
there's no problem here. If you do not trust the client machines then this is
a potential danger.
Ways to resolve this include:
* Use :ref:`pipelining`. When pipelining is enabled, Ansible doesn't save the
module to a temporary file on the client. Instead it pipes the module to
the remote python interpreter's stdin. Pipelining does not work for
non-python modules.
* (Available in Ansible 2.1) Install POSIX.1e filesystem acl support on the
managed host. If the temporary directory on the remote host is mounted with
POSIX acls enabled and the :command:`setfacl` tool is in the remote ``PATH``
then Ansible will use POSIX acls to share the module file with the second
unprivileged user instead of having to make the file readable by everyone.
* Don't perform an action on the remote machine by becoming an unprivileged
user. Temporary files are protected by UNIX file permissions when you
``become`` root or do not use ``become``. In Ansible 2.1 and above, UNIX
file permissions are also secure if you make the connection to the managed
machine as root and then use ``become`` to an unprivileged account.
.. warning:: Although the Solaris ZFS filesystem has filesystem ACLs, the ACLs
are not POSIX.1e filesystem acls (they are NFSv4 ACLs instead). Ansible
cannot use these ACLs to manage its temp file permissions so you may have
to resort to ``allow_world_readable_tmpfiles`` if the remote machines use ZFS.
.. versionchanged:: 2.1
In addition to the additional means of doing this securely, Ansible 2.1 also
makes it harder to unknowingly do this insecurely. Whereas in Ansible 2.0.x
and below, Ansible will silently allow the insecure behaviour if it was unable
to find another way to share the files with the unprivileged user, in Ansible
2.1 and above Ansible defaults to issuing an error if it can't do this
securely. If you can't make any of the changes above to resolve the problem,
and you decide that the machine you're running on is secure enough for the
modules you want to run there to be world readable, you can turn on
``allow_world_readable_tmpfiles`` in the :file:`ansible.cfg` file. Setting
``allow_world_readable_tmpfiles`` will change this from an error into
a warning and allow the task to run as it did prior to 2.1.
Connection Plugin Support
=========================
Privilege escalation methods must also be supported by the connection plugin
used. Most connection plugins will warn if they do not support become. Some
will just ignore it as they always run as root (jail, chroot, etc).
Only one method may be enabled per host
=======================================
Methods cannot be chained. You cannot use ``sudo /bin/su -`` to become a user,
you need to have privileges to run the command as that user in sudo or be able
to su directly to it (the same for pbrun, pfexec or other supported methods).
Can't limit escalation to certain commands
==========================================
Privilege escalation permissions have to be general. Ansible does not always
use a specific command to do something but runs modules (code) from
a temporary file name which changes every time. If you have '/sbin/service'
or '/bin/chmod' as the allowed commands this will fail with ansible as those
paths won't match with the temporary file that ansible creates to run the
module.
.. seealso::
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Committers Guidelines (for people with commit rights to Ansible on GitHub)
``````````````````````````````````````````````````````````````````````````
These are the guidelines for people with commit access to Ansible. Committers are essentially acting as members of the Ansible Core team, although not necessarily as an employee of Ansible and Red Hat. Please read the guidelines before you commit.
These guidelines apply to everyone. At the same time, this ISNT a process document. So just use good judgement. Youve been given commit access because we trust your judgement.
That said, use the trust wisely.
If you abuse the trust and break components and builds, etc., the trust level falls and you may be asked not to commit or you may lose access to do so.
Features, High Level Design, and Roadmap
========================================
As a core team member, you are an integral part of the team that develops the roadmap. Please be engaged, and push for the features and fixes that you want to see. Also keep in mind that Red Hat, as a company, will commit to certain features, fixes, APIs, etc. for various releases. Red Hat, the company, and the Ansible team must get these committed features (etc.) completed and released as scheduled. Obligations to users, the community, and customers must come first. Because of these commitments, a feature you want to develop yourself many not get into a release if it impacts a lot of other parts within Ansible.
Any other new features and changes to high level design should go through the proposal process (TBD), to ensure the community and core team have had a chance to review the idea and approve it. The core team has sole responsibility for merging new features based on proposals.
Our Workflow on GitHub
======================
As a committer, you may already know this, but our workflow forms a lot of our team policies. Please ensure youre aware of the following workflow steps:
* Fork the repository upon which you want to do some work to your own personal repository
* Work on the specific branch upon which you need to commit
* Create a Pull Request back to the Ansible repository and tag the people you would like to review; assign someone as the primary “owner” of your request
* Adjust code as necessary based on the Comments provided
* Ask someone on the Core Team to do a final review and merge
Addendum to workflow for Committers:
------------------------------------
The Core Team is aware that this can be a difficult process at times. Sometimes, the team breaks the rules: Direct commits, merging their own PRs. This section is a set of guidelines. If youre changing a comma in a doc, or making a very minor change, you can use your best judgement. This is another trust thing. The process is critical for any major change, but for little things or getting something done quickly, use your best judgement and make sure people on the team are aware of your work.
Roles on Core
=============
* Core Committers: Fine to do PRs for most things, but we should have a timebox. Hanging PRs may merge on the judgement of these devs.
* Module Owners: Module Owners own specific modules and have indirect commit access via the current module PR mechanisms.
General Rules
=============
Individuals with direct commit access to ansible/ansible (+core, + extras) are entrusted with powers that allow them to do a broad variety of things--probably more than we can write down. Rather than rules, treat these as general *guidelines*, individuals with this power are expected to use their best judgement.
* Dont
- Commit directly.
- Merge your own PRs. Someone else should have a chance to review and approve the PR merge. If you are a Core Committer, you have a small amount of leeway here for very minor changes.
- Forget about alternate environments. Consider the alternatives--yes, people have bad environments, but they are the ones who need us the most.
- Drag your community team members down. Always discuss the technical merits, but you should never address the persons limitations (you can later go for beers and call them idiots, but not in IRC/Github/etc.).
- Forget about the maintenance burden. Some things are really cool to have, but they might not be worth shoehorning in if the maintenance burden is too great.
- Break playbooks. Always keep backwards compatibility in mind.
- Forget to keep it simple. Complexity breeds all kinds of problems.
* Do
- Squash, avoid merges whenever possible, use github's squash commits or cherry pick if needed (bisect thanks you).
- Be active. Committers who have no activity on the project (through merges, triage, commits, etc.) will have their permissions suspended.
- Consider backwards compatibility (goes back to "dont break existing playbooks").
- Write tests. PRs with tests are looked at with more priority than PRs without tests that should have them included. While not all changes require tests, be sure to add them for bug fixes or functionality changes.
- Discuss with other committers, specially when you are unsure of something.
- Document! If your PR is a new feature or a change to behavior, make sure you've updated all associated documentation or have notified the right people to do so. It also helps to add the version of Core against which this documentation is compatible (to avoid confusion with stable versus devel docs, for backwards compatibility, etc.).
- Consider scope, sometimes a fix can be generalized
- Keep it simple, then things are maintainable, debuggable and intelligible.
Committers are expected to continue to follow the same community and contribution guidelines followed by the rest of the Ansible community.
People
======
Individuals who've been asked to become a part of this group have generally been contributing in significant ways to the Ansible community for some time. Should they agree, they are requested to add their names and GitHub IDs to this file, in the section below, via a pull request. Doing so indicates that these individuals agree to act in the ways that their fellow committers trust that they will act.
+---------------------+----------------------+--------------------+----------------------+
| Name | Github ID | IRC Nick | Other |
+=====================+======================+====================+======================+
| James Cammarata | jimi-c | jimi | |
+---------------------+----------------------+--------------------+----------------------+
| Brian Coca | bcoca | bcoca | mdyson@cyberdyne.com |
+---------------------+----------------------+--------------------+----------------------+
| Matt Davis | nitzmahone | nitzmahone | |
+---------------------+----------------------+--------------------+----------------------+
| Toshio Kuratomi | abadger | abadger1999 | |
+---------------------+----------------------+--------------------+----------------------+
| Jason McKerr | mckerrj | newtMcKerr | |
+---------------------+----------------------+--------------------+----------------------+
| Robyn Bergeron | robynbergeron | rbergeron | |
+---------------------+----------------------+--------------------+----------------------+
| Greg DeKoenigsberg | gregdek | gregdek | |
+---------------------+----------------------+--------------------+----------------------+
| Monty Taylor | emonty | mordred | |
+---------------------+----------------------+--------------------+----------------------+
| Matt Martz | sivel | sivel | |
+---------------------+----------------------+--------------------+----------------------+
| Nate Case | qalthos | Qalthos | |
+---------------------+----------------------+--------------------+----------------------+
| James Tanner | jctanner | jtanner | |
+---------------------+----------------------+--------------------+----------------------+
| Peter Sprygada | privateip | privateip | |
+---------------------+----------------------+--------------------+----------------------+
| Abhijit Menon-Sen | amenonsen | crab | |
+---------------------+----------------------+--------------------+----------------------+
| Michael Scherer | mscherer | misc | |
+---------------------+----------------------+--------------------+----------------------+
| René Moser | resmo | resmo | |
+---------------------+----------------------+--------------------+----------------------+
| David Shrewsbury | Shrews | Shrews | |
+---------------------+----------------------+--------------------+----------------------+
| Sandra Wills | docschick | docschick | |
+---------------------+----------------------+--------------------+----------------------+
| Graham Mainwaring | ghjm | | |
+---------------------+----------------------+--------------------+----------------------+
| Jon Davila | defionscode | | |
+---------------------+----------------------+--------------------+----------------------+
| Chris Houseknecht | chouseknecht | | |
+---------------------+----------------------+--------------------+----------------------+
| Trond Hindenes | trondhindenes | | |
+---------------------+----------------------+--------------------+----------------------+
| Jon Hawkesworth | jhawkseworth | jhawkseworth | |
+---------------------+----------------------+--------------------+----------------------+
| Will Thames | wilthames | willthames | |
+---------------------+----------------------+--------------------+----------------------+
| Ryan Brown | ryansb | ryansb | |
+---------------------+----------------------+--------------------+----------------------+
| Adrian Likins | alikins | alikins | |
+---------------------+----------------------+--------------------+----------------------+

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.. _common_return_values:
Common Return Values
====================
.. contents:: Topics
Ansible modules normally return a data structure that can be registered into a variable, or seen directly when output by
the `ansible` program. Each module can optionally document its own unique return values (visible through ansible-doc and https://docs.ansible.com).
This document covers return values common to all modules.
.. note:: Some of these keys might be set by Ansible itself once it processes the module's return information.
backup_file
```````````
For those modules that implement `backup=no|yes` when manipulating files, a path to the backup file created.
changed
```````
A boolean indicating if the task had to make changes.
failed
``````
A boolean that indicates if the task was failed or not.
invocation
``````````
Information on how the module was invoked.
msg
```
A string with a generic message relayed to the user.
rc
``
Some modules execute command line utilities or are geared for executing commands directly (raw, shell, command, etc), this field contains 'return code' of these utilities.
results
```````
If this key exists, it indicates that a loop was present for the task and that it contains a list of the normal module 'result' per item.
skipped
```````
A boolean that indicates if the task was skipped or not
stderr
``````
Some modules execute command line utilities or are geared for executing commands directly (raw, shell, command, etc), this field contains the error output of these utilities.
stderr_lines
````````````
When c(stderr) is returned we also always provide this field which is a list of strings, one item per line from the original.
stdout
``````
Some modules execute command line utilities or are geared for executing commands directly (raw, shell, command, etc). This field contains the normal output of these utilities.
stdout_lines
````````````
When c(stdout) is returned, Ansible always provides a list of strings, each containing one item per line from the original output.
Internal use
============
These keys can be added by modules but will be removed from registered variables; they are 'consumed' by Ansible itself.
ansible_facts
`````````````
This key should contain a dictionary which will be appended to the facts assigned to the host. These will be directly accessible and don't require using a registered variable.
exception
`````````
This key can contain traceback information caused by an exception in a module. It will only be displayed on high verbosity (-vvv).
warnings
````````
This key contains a list of strings that will be presented to the user.
.. seealso::
:doc:`modules`
Learn about available modules
`GitHub Core modules directory <https://github.com/ansible/ansible-modules-core/tree/devel>`_
Browse source of core modules
`Github Extras modules directory <https://github.com/ansible/ansible-modules-extras/tree/devel>`_
Browse source of extras modules.
`Mailing List <http://groups.google.com/group/ansible-devel>`_
Development mailing list
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Community Information & Contributing
````````````````````````````````````
Ansible is an open source project designed to bring together administrators and developers of all kinds to collaborate on building
IT automation solutions that work well for them.
Should you wish to get more involved -- whether in terms of just asking a question, helping other users, introducing new people to Ansible, or helping with the software or documentation, we welcome your contributions to the project.
.. contents:: Topics
Ansible Users
=============
I've Got A Question
-------------------
We're happy to help!
Ansible questions are best asked on the `Ansible Google Group Mailing List <http://groups.google.com/group/ansible-project>`_.
This is a very large high-traffic list for answering questions and sharing tips
and tricks. Anyone can join, and email delivery is optional if you just want to read the group online. To cut down on spam, your first post is moderated, though posts are approved quickly.
Please be sure to share any relevant commands you ran, output, and detail, indicate the version of Ansible you are using when asking a question.
Where needed, link to gists or GitHub repos to show examples, rather than sending attachments to the list.
We recommend using Google search to see if a topic has been answered recently, but comments found in older threads may no longer apply, depending on the topic.
Before you post, be sure you are running the latest stable version of Ansible. You can check this by comparing the output of ``ansible --version`` with the version indicated on `PyPi <https://pypi.python.org/pypi/ansible>`_.
Alternatively, you can also join our IRC channel - #ansible on irc.freenode.net. It's a very high traffic channel as well, if you don't get an answer you like, please stop by our mailing list, which is more likely
to get attention of core developers since it's asynchronous.
I'd Like To Keep Up With Release Announcements
----------------------------------------------
Release announcements are posted to ansible-project, though if you don't want to keep up with the very active list, you can join the `Ansible Announce Mailing List <http://groups.google.com/group/ansible-announce>`_.
This is a low-traffic read-only list, where we'll share release announcements and occasionally links to major Ansible Events around the world.
I'd Like To Help Share and Promote Ansible
------------------------------------------
You can help share Ansible with others by telling friends and colleagues, writing a blog post,
or presenting at user groups (like DevOps groups or the local LUG).
You are also welcome to share slides on speakerdeck, sign up for a free account and tag it “Ansible”. On Twitter,
you can also share things with #ansible and may wish to `follow us <https://twitter.com/ansible>`_.
I'd Like To Help Ansible Move Faster
------------------------------------
If you're a developer, one of the most valuable things you can do is look at the GitHub issues list and help fix bugs. We almost always prioritize bug fixing over
feature development, so clearing bugs out of the way is one of the best things you can do.
If you're not a developer, helping test pull requests for bug fixes and features is still immensely valuable. You can do this by checking out ansible, making a test
branch off the main one, merging a GitHub issue, testing, and then commenting on that particular issue on GitHub.
I'd Like To Report A Bug
------------------------------------
Ansible practices responsible disclosure - if this is a security related bug, email `security@ansible.com <mailto:security@ansible.com>`_ instead of filing a ticket or posting to the Google Group and you will receive a prompt response.
Bugs related to the core language should be reported to `github.com/ansible/ansible <https://github.com/ansible/ansible>`_ after
signing up for a free GitHub account. Before reporting a bug, please use the bug/issue search
to see if the issue has already been reported.
MODULE related bugs however should go to `ansible-modules-core <https://github.com/ansible/ansible-modules-core>`_ or `ansible-modules-extras <https://github.com/ansible/ansible-modules-extras>`_ based on the classification of the module. This is listed on the bottom of the docs page for any module.
When filing a bug, please use the `issue template <https://github.com/ansible/ansible/raw/devel/.github/ISSUE_TEMPLATE.md>`_ to provide all relevant information, regardless of what repo you are filing a ticket against.
Knowing your ansible version and the exact commands you are running, and what you expect, saves time and helps us help everyone with their issues
more quickly.
Do not use the issue tracker for "how do I do this" type questions. These are great candidates
for IRC or the mailing list instead where things are likely to be more of a discussion.
To be respectful of reviewers' time and allow us to help everyone efficiently, please
provide minimal well-reduced and well-commented examples versus sharing your entire production
playbook. Include playbook snippets and output where possible.
When sharing YAML in playbooks, formatting can be preserved by using `code blocks <https://help.github.com/articles/github-flavored-markdown#fenced-code-blocks>`_.
For multiple-file content, we encourage use of gist.github.com. Online pastebin content can expire, so it's nice to have things around for a longer term if they
are referenced in a ticket.
If you are not sure if something is a bug yet, you are welcome to ask about something on
the mailing list or IRC first.
As we are a very high volume project, if you determine that
you do have a bug, please be sure to open the issue yourself to ensure we have a record of
it. Dont rely on someone else in the community to file the bug report for you.
It may take some time to get to your report, see our information about priority flags below.
I'd Like To Help With Documentation
-----------------------------------
Ansible documentation is a community project too!
If you would like to help with the
documentation, whether correcting a typo or improving a section, or maybe even
documenting a new feature, submit a GitHub pull request to the code that
lives in the ``docsite/rst`` subdirectory of the project for most pages, and there is an "Edit on GitHub"
link up on those.
Module documentation is generated from a DOCUMENTATION structure embedded in the source code of each module, which is in either the ansible-modules-core or ansible-modules-extra repos on GitHub, depending on the module. Information about this is always listed on the bottom of the web documentation for each module.
Aside from modules, the main docs are in restructured text
format.
If you arent comfortable with restructured text, you can also open a ticket on
GitHub about any errors you spot or sections you would like to see added. For more information
on creating pull requests, please refer to the
`github help guide <https://help.github.com/articles/using-pull-requests>`_.
For Current and Prospective Developers
=======================================
I'd Like To Learn How To Develop on Ansible
-------------------------------------------
If you're new to Ansible and would like to figure out how to work on things, stop by the ansible-devel mailing list
and say hi, and we can hook you up.
A great way to get started would be reading over some of the development documentation on the module site, and then
finding a bug to fix or small feature to add.
Modules are some of the easiest places to get started.
Contributing Code (Features or Bugfixes)
----------------------------------------
The Ansible project keeps its source on GitHub at `github.com/ansible/ansible <https://github.com/ansible/ansible>`_ for
the core application, and two sub repos `github.com/ansible/ansible-modules-core <https://github.com/ansible/ansible-modules-core>`_
and `ansible/ansible-modules-extras <https://github.com/ansible/ansible-modules-extras>`_ for module related items.
If you need to know if a module is in 'core' or 'extras', consult the web documentation page for that module.
The project takes contributions through `github pull requests <https://help.github.com/articles/using-pull-requests>`_.
It is usually a good idea to join the ansible-devel list to discuss any large features prior to submission,
and this especially helps in avoiding duplicate work or efforts where we decide, upon seeing a pull request
for the first time, that revisions are needed. (This is not usually needed for module development, but can be nice for large changes).
Note that we do keep Ansible to a particular aesthetic, so if you are unclear about whether a feature
is a good fit or not, having the discussion on the development list is often a lot easier than having
to modify a pull request later.
New module developers should read through `developing modules <http://docs.ansible.com/ansible/dev_guide/developing_modules.html>`_ for helpful pointers
and information about running adhoc tests `testing modules <http://docs.ansible.com/ansible/dev_guide/developing_modules.html#testing-modules>`_.
When submitting patches, be sure to run the unit tests first ``make tests`` and always use, these are the same basic
tests that will automatically run on Shippable when creating the PR. There are more in depth tests in the ``tests/integration``
directory, classified as destructive and non_destructive, run these if they pertain to your modification. They are set up
with tags so you can run subsets, some of the tests require cloud credentials and will only run if they are provided.
When adding new features or fixing bugs it would be nice to add new tests to avoid regressions. For more information about testing see `test/README.md <https://github.com/ansible/ansible/blob/devel/test/README.md>`_.
In order to keep the history clean and better audit incoming code, we will require resubmission of pull requests that
contain merge commits. Use ``git pull --rebase`` (rather than ``git pull``) and ``git rebase`` (rather than ``git merge``). Also be sure to use topic
branches to keep your additions on different branches, such that they won't pick up stray commits later.
If you make a mistake you do not need to close your PR, create a clean branch locally and then push to GitHub
with ``--force`` to overwrite the existing branch (permissible in this case as no one else should be using that
branch as reference). Code comments won't be lost, they just won't be attached to the existing branch.
Well then review your contributions and engage with you about questions and so on.
Because we have a very large and active community it may take awhile to get your contributions
in! See the notes about priorities in a later section for understanding our work queue.
Be patient, your request might not get merged right away, we also try to keep the devel branch more
or less usable so we like to examine Pull requests carefully, which takes time.
Patches should always be made against the ``devel`` branch.
Keep in mind that small and focused requests are easier to examine and accept, having example cases
also help us understand the utility of a bug fix or a new feature.
Contributions can be for new features like modules, or to fix bugs you or others have found. If you
are interested in writing new modules to be included in the core Ansible distribution, please refer
to the `module development documentation <http://docs.ansible.com/developing_modules.html>`_.
Ansible's aesthetic encourages simple, readable code and consistent, conservatively extending,
backwards-compatible improvements. Code developed for Ansible needs to support Python 2.6+,
while code in modules must run under Python 2.4 or higher. Please also use a 4-space indent
and no tabs, we do not enforce 80 column lines, we are fine with 120-140. We do not take 'style only'
requests unless the code is nearly unreadable, we are "PEP8ish", but not strictly compliant.
You can also contribute by testing and revising other requests, especially if it is one you are interested
in using. Please keep your comments clear and to the point, courteous and constructive, tickets are not a
good place to start discussions (ansible-devel and IRC exist for this).
Tip: To easily run from a checkout, source ``./hacking/env-setup`` and that's it -- no install
required. You're now live! For more information see `hacking/README.md <https://github.com/ansible/ansible/blob/devel/hacking/README.md>`_.
Other Topics
============
Ansible Staff
-------------
Ansible, Inc is a company supporting Ansible and building additional solutions based on
Ansible. We also do services and support for those that are interested. We also offer an
enterprise web front end to Ansible (see Tower below).
Our most important task however is enabling all the great things that happen in the Ansible
community, including organizing software releases of Ansible. For more information about
any of these things, contact info@ansible.com
On IRC, you can find us as jimi_c, abadger1999, Tybstar, bcoca, and others. On the mailing list,
we post with an @ansible.com address.
Mailing List Information
------------------------
Ansible has several mailing lists. Your first post to the mailing list will be
moderated (to reduce spam), so please allow a day or less for your first post.
`Ansible Project List <https://groups.google.com/forum/#!forum/ansible-project>`_ is for sharing Ansible Tips,
answering questions, and general user discussion.
`Ansible Development List <https://groups.google.com/forum/#!forum/ansible-devel>`_ is for learning how to develop on Ansible,
asking about prospective feature design, or discussions about extending ansible or features in progress.
`Ansible Announce list <https://groups.google.com/forum/#!forum/ansible-announce>`_ is a read-only list that shares information
about new releases of Ansible, and also rare infrequent event information, such as announcements about an AnsibleFest coming up,
which is our official conference series.
`Ansible Lockdown List <https://groups.google.com/forum/#!forum/ansible-lockdown>`_ is for all things related to Ansible Lockdown projects, including DISA STIG automation and CIS Benchmarks.
To subscribe to a group from a non-google account, you can send an email to the subscription address requesting the subscription. For example: ansible-devel+subscribe@googlegroups.com
IRC Meetings
------------
The Ansible community holds regular IRC meetings on various topics, and anyone who is interested is invited to
participate. For more information about Ansible meetings, consult the `meeting schedule and agenda page <https://github.com/ansible/community/blob/master/MEETINGS.md>`_.
Release Numbering
-----------------
Releases ending in ".0" are major releases and this is where all new features land. Releases ending
in another integer, like "0.X.1" and "0.X.2" are dot releases, and these are only going to contain
bugfixes.
Typically we don't do dot releases for minor bugfixes (reserving these for larger items),
but may occasionally decide to cut dot releases containing a large number of smaller fixes if it's still a fairly long time before
the next release comes out.
Releases are also given code names based on Van Halen songs, that no one really uses.
Tower Support Questions
-----------------------
Ansible `Tower <http://ansible.com/tower>`_ is a UI, Server, and REST endpoint for Ansible, produced by Ansible, Inc.
If you have a question about Tower, visit `support.ansible.com <https://support.ansible.com/>`_ rather than using the IRC
channel or the general project mailing list.
IRC Channel
-----------
Ansible has several IRC channels on Freenode (irc.freenode.net):
- #ansible - For general use questions and support.
- #ansible-devel - For discussions on developer topics and code related to features/bugs.
- #ansible-meeting - For public community meetings. We will generally announce these on one or more of the above mailing lists. See the `meeting schedule and agenda page <https://github.com/ansible/community/blob/master/MEETINGS.md>`_
- #ansible-notices - Mostly bot output from things like Github, etc.
Notes on Priority Flags
-----------------------
Ansible was one of the top 5 projects with the most OSS contributors on GitHub in 2013, and has over 1400 contributors
to the project to date, not to mention a very large user community that has downloaded the application well over a million
times.
As a result, we have a LOT of incoming activity to process.
In the interest of transparency, we're telling you how we sort incoming requests.
In our bug tracker you'll notice some labels - P1, P2, P3, P4, and P5. These are our internal
priority orders that we use to sort tickets.
With some exceptions for easy merges (like documentation typos for instance),
we're going to spend most of our time working on P1 and P2 items first, including pull requests.
These usually relate to important bugs or features affecting large segments of the userbase. So if you see something categorized
"P3 or P4", and it's not appearing to get a lot of immediate attention, this is why.
These labels don't really have definition - they are a simple ordering. However something
affecting a major module (yum, apt, etc) is likely to be prioritized higher than a module
affecting a smaller number of users.
Since we place a strong emphasis on testing and code review, it may take a few months for a minor feature to get merged.
Don't worry though -- we'll also take periodic sweeps through the lower priority queues and give
them some attention as well, particularly in the area of new module changes. So it doesn't necessarily
mean that we'll be exhausting all of the higher-priority queues before getting to your ticket.
Every bit of effort helps - if you're wishing to expedite the inclusion of a P3 feature pull request for instance, the best thing you can do
is help close P2 bug reports.
Community Code of Conduct
=========================
Every community can be strengthened by a diverse variety of viewpoints, insights,
opinions, skillsets, and skill levels. However, with diversity comes the potential for
disagreement and miscommunication. The purpose of this Code of Conduct is to ensure that
disagreements and differences of opinion are conducted respectfully and on their own
merits, without personal attacks or other behavior that might create an unsafe or
unwelcoming environment.
These policies are not designed to be a comprehensive set of Things You Cannot Do. We ask
that you treat your fellow community members with respect and courtesy, and in general,
Don't Be A Jerk. This Code of Conduct is meant to be followed in spirit as much as in
letter and is not exhaustive.
All Ansible events and participants therein are governed by this Code of Conduct and
anti-harassment policy. We expect organizers to enforce these guidelines throughout all events,
and we expect attendees, speakers, sponsors, and volunteers to help ensure a safe
environment for our whole community. Specifically, this Code of Conduct covers
participation in all Ansible-related forums and mailing lists, code and documentation
contributions, public IRC channels, private correspondence, and public meetings.
Ansible community members are...
**Considerate**
Contributions of every kind have far-ranging consequences. Just as your work depends on
the work of others, decisions you make surrounding your contributions to the Ansible
community will affect your fellow community members. You are strongly encouraged to take
those consequences into account while making decisions.
**Patient**
Asynchronous communication can come with its own frustrations, even in the most responsive
of communities. Please remember that our community is largely built on volunteered time,
and that questions, contributions, and requests for support may take some time to receive
a response. Repeated "bumps" or "reminders" in rapid succession are not good displays of
patience. Additionally, it is considered poor manners to ping a specific person with
general questions. Pose your question to the community as a whole, and wait patiently for
a response.
**Respectful**
Every community inevitably has disagreements, but remember that it is
possible to disagree respectfully and courteously. Disagreements are never an excuse for
rudeness, hostility, threatening behavior, abuse (verbal or physical), or personal attacks.
**Kind**
Everyone should feel welcome in the Ansible community, regardless of their background.
Please be courteous, respectful and polite to fellow community members. Do not make or
post offensive comments related to skill level, gender, gender identity or expression,
sexual orientation, disability, physical appearance, body size, race, or religion.
Sexualized images or imagery, real or implied violence, intimidation, oppression,
stalking, sustained disruption of activities, publishing the personal information of
others without explicit permission to do so, unwanted physical contact, and unwelcome
sexual attention are all strictly prohibited. Additionally, you are encouraged not to
make assumptions about the background or identity of your fellow community members.
**Inquisitive**
The only stupid question is the one that does not get asked. We
encourage our users to ask early and ask often. Rather than asking whether you can ask a
question (the answer is always yes!), instead, simply ask your question. You are
encouraged to provide as many specifics as possible. Code snippets in the form of Gists or
other paste site links are almost always needed in order to get the most helpful answers.
Refrain from pasting multiple lines of code directly into the IRC channels - instead use
gist.github.com or another paste site to provide code snippets.
**Helpful**
The Ansible community is committed to being a welcoming environment for all users,
regardless of skill level. We were all beginners once upon a time, and our community
cannot grow without an environment where new users feel safe and comfortable asking questions.
It can become frustrating to answer the same questions repeatedly; however, community
members are expected to remain courteous and helpful to all users equally, regardless of
skill or knowledge level. Avoid providing responses that prioritize snideness and snark over
useful information. At the same time, everyone is expected to read the provided
documentation thoroughly. We are happy to answer questions, provide strategic guidance,
and suggest effective workflows, but we are not here to do your job for you.
Anti-harassment policy
----------------------
Harassment includes (but is not limited to) all of the following behaviors:
- Offensive comments related to gender (including gender expression and identity), age, sexual orientation, disability, physical appearance, body size, race, and religion
- Derogatory terminology including words commonly known to be slurs
- Posting sexualized images or imagery in public spaces
- Deliberate intimidation
- Stalking
- Posting others' personal information without explicit permission
- Sustained disruption of talks or other events
- Inappropriate physical contact
- Unwelcome sexual attention
Participants asked to stop any harassing behavior are expected to comply immediately.
Sponsors are also subject to the anti-harassment policy. In particular, sponsors should
not use sexualized images, activities, or other material. Meetup organizing staff and
other volunteer organizers should not use sexualized attire or otherwise create a
sexualized environment at community events.
In addition to the behaviors outlined above, continuing to behave a certain way after you
have been asked to stop also constitutes harassment, even if that behavior is not
specifically outlined in this policy. It is considerate and respectful to stop doing
something after you have been asked to stop, and all community members are expected to
comply with such requests immediately.
Policy violations
-----------------
Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by
contacting greg@ansible.com, to any channel operator in the community IRC
channels, or to the local organizers of an event. Meetup organizers are encouraged to
prominently display points of contact for reporting unacceptable behavior at local events.
If a participant engages in harassing behavior, the meetup organizers may take any action
they deem appropriate. These actions may include but are not limited to warning the
offender, expelling the offender from the event, and barring the offender from future
community events.
Organizers will be happy to help participants contact security or local law enforcement,
provide escorts to an alternate location, or otherwise assist those experiencing
harassment to feel safe for the duration of the meetup. We value the safety and well-being
of our community members and want everyone to feel welcome at our events, both online and
offline.
We expect all participants, organizers, speakers, and attendees to follow these policies at
our all of our event venues and event-related social events.
The Ansible Community Code of Conduct is licensed under the Creative Commons
Attribution-Share Alike 3.0 license. Our Code of Conduct was adapted from Codes of Conduct
of other open source projects, including:
* Contributor Covenant
* Elastic
* The Fedora Project
* OpenStack
* Puppet Labs
* Ubuntu
Contributors License Agreement
==============================
By contributing you agree that these contributions are your own (or approved by your employer) and you grant a full, complete, irrevocable
copyright license to all users and developers of the project, present and future, pursuant to the license of the project.

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.PHONY: coverage
coverage:
$(SPHINXBUILD) -b coverage $(ALLSPHINXOPTS) $(BUILDDIR)/coverage
@echo "Testing of coverage in the sources finished, look at the " \
"results in $(BUILDDIR)/coverage/python.txt."
.PHONY: xml
xml:
$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
@echo
@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
.PHONY: pseudoxml
pseudoxml:
$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
@echo
@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."
.PHONY: dummy
dummy:
$(SPHINXBUILD) -b dummy $(ALLSPHINXOPTS) $(BUILDDIR)/dummy
@echo
@echo "Build finished. Dummy builder generates no files."

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@ -0,0 +1,417 @@
# -*- coding: utf-8 -*-
#
# dev_guide documentation build configuration file, created by
# sphinx-quickstart on Mon Aug 15 13:24:02 2016.
#
# This file is execfile()d with the current directory set to its
# containing dir.
#
# Note that not all possible configuration values are present in this
# autogenerated file.
#
# All configuration values have a default; values that are commented out
# serve to show the default.
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
# documentation root, use os.path.abspath to make it absolute, like shown here.
#
# import os
# import sys
# sys.path.insert(0, os.path.abspath('.'))
# -- General configuration ------------------------------------------------
# If your documentation needs a minimal Sphinx version, state it here.
#
# needs_sphinx = '1.0'
# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = []
# Add any paths that contain templates here, relative to this directory.
templates_path = ['_templates']
# The suffix(es) of source filenames.
# You can specify multiple suffix as a list of string:
#
# source_suffix = ['.rst', '.md']
source_suffix = '.rst'
# The encoding of source files.
#
# source_encoding = 'utf-8-sig'
# The master toctree document.
master_doc = 'index'
# General information about the project.
project = u'dev_guide'
copyright = u'2016, Ansible'
author = u'Ansible'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The short X.Y version.
version = u'1.0'
# The full version, including alpha/beta/rc tags.
release = u'1.0'
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#
# This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases.
language = None
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
#
# today = ''
#
# Else, today_fmt is used as the format for a strftime call.
#
# today_fmt = '%B %d, %Y'
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
# This patterns also effect to html_static_path and html_extra_path
exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
# The reST default role (used for this markup: `text`) to use for all
# documents.
#
# default_role = None
# If true, '()' will be appended to :func: etc. cross-reference text.
#
# add_function_parentheses = True
# If true, the current module name will be prepended to all description
# unit titles (such as .. function::).
#
# add_module_names = True
# If true, sectionauthor and moduleauthor directives will be shown in the
# output. They are ignored by default.
#
# show_authors = False
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'sphinx'
# A list of ignored prefixes for module index sorting.
# modindex_common_prefix = []
# If true, keep warnings as "system message" paragraphs in the built documents.
# keep_warnings = False
# If true, `todo` and `todoList` produce output, else they produce nothing.
todo_include_todos = False
# -- Options for HTML output ----------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
#
html_theme = 'alabaster'
# Theme options are theme-specific and customize the look and feel of a theme
# further. For a list of options available for each theme, see the
# documentation.
#
# html_theme_options = {}
# Add any paths that contain custom themes here, relative to this directory.
# html_theme_path = []
# The name for this set of Sphinx documents.
# "<project> v<release> documentation" by default.
#
# html_title = u'dev_guide v1.0'
# A shorter title for the navigation bar. Default is the same as html_title.
#
# html_short_title = None
# The name of an image file (relative to this directory) to place at the top
# of the sidebar.
#
# html_logo = None
# The name of an image file (relative to this directory) to use as a favicon of
# the docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
# pixels large.
#
# html_favicon = None
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ['_static']
# Add any extra paths that contain custom files (such as robots.txt or
# .htaccess) here, relative to this directory. These files are copied
# directly to the root of the documentation.
#
# html_extra_path = []
# If not None, a 'Last updated on:' timestamp is inserted at every page
# bottom, using the given strftime format.
# The empty string is equivalent to '%b %d, %Y'.
#
# html_last_updated_fmt = None
# If true, SmartyPants will be used to convert quotes and dashes to
# typographically correct entities.
#
# html_use_smartypants = True
# Custom sidebar templates, maps document names to template names.
#
# html_sidebars = {}
# Additional templates that should be rendered to pages, maps page names to
# template names.
#
# html_additional_pages = {}
# If false, no module index is generated.
#
# html_domain_indices = True
# If false, no index is generated.
#
# html_use_index = True
# If true, the index is split into individual pages for each letter.
#
# html_split_index = False
# If true, links to the reST sources are added to the pages.
#
# html_show_sourcelink = True
# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
#
# html_show_sphinx = True
# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
#
# html_show_copyright = True
# If true, an OpenSearch description file will be output, and all pages will
# contain a <link> tag referring to it. The value of this option must be the
# base URL from which the finished HTML is served.
#
# html_use_opensearch = ''
# This is the file name suffix for HTML files (e.g. ".xhtml").
# html_file_suffix = None
# Language to be used for generating the HTML full-text search index.
# Sphinx supports the following languages:
# 'da', 'de', 'en', 'es', 'fi', 'fr', 'hu', 'it', 'ja'
# 'nl', 'no', 'pt', 'ro', 'ru', 'sv', 'tr', 'zh'
#
# html_search_language = 'en'
# A dictionary with options for the search language support, empty by default.
# 'ja' uses this config value.
# 'zh' user can custom change `jieba` dictionary path.
#
# html_search_options = {'type': 'default'}
# The name of a javascript file (relative to the configuration directory) that
# implements a search results scorer. If empty, the default will be used.
#
# html_search_scorer = 'scorer.js'
# Output file base name for HTML help builder.
htmlhelp_basename = 'dev_guidedoc'
# -- Options for LaTeX output ---------------------------------------------
latex_elements = {
# The paper size ('letterpaper' or 'a4paper').
#
# 'papersize': 'letterpaper',
# The font size ('10pt', '11pt' or '12pt').
#
# 'pointsize': '10pt',
# Additional stuff for the LaTeX preamble.
#
# 'preamble': '',
# Latex figure (float) alignment
#
# 'figure_align': 'htbp',
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
# author, documentclass [howto, manual, or own class]).
latex_documents = [
(master_doc, 'dev_guide.tex', u'dev\\_guide Documentation',
u'Ansible', 'manual'),
]
# The name of an image file (relative to this directory) to place at the top of
# the title page.
#
# latex_logo = None
# For "manual" documents, if this is true, then toplevel headings are parts,
# not chapters.
#
# latex_use_parts = False
# If true, show page references after internal links.
#
# latex_show_pagerefs = False
# If true, show URL addresses after external links.
#
# latex_show_urls = False
# Documents to append as an appendix to all manuals.
#
# latex_appendices = []
# If false, no module index is generated.
#
# latex_domain_indices = True
# -- Options for manual page output ---------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
(master_doc, 'dev_guide', u'dev_guide Documentation',
[author], 1)
]
# If true, show URL addresses after external links.
#
# man_show_urls = False
# -- Options for Texinfo output -------------------------------------------
# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
# dir menu entry, description, category)
texinfo_documents = [
(master_doc, 'dev_guide', u'dev_guide Documentation',
author, 'dev_guide', 'One line description of project.',
'Miscellaneous'),
]
# Documents to append as an appendix to all manuals.
#
# texinfo_appendices = []
# If false, no module index is generated.
#
# texinfo_domain_indices = True
# How to display URL addresses: 'footnote', 'no', or 'inline'.
#
# texinfo_show_urls = 'footnote'
# If true, do not generate a @detailmenu in the "Top" node's menu.
#
# texinfo_no_detailmenu = False
# -- Options for Epub output ----------------------------------------------
# Bibliographic Dublin Core info.
epub_title = project
epub_author = author
epub_publisher = author
epub_copyright = copyright
# The basename for the epub file. It defaults to the project name.
# epub_basename = project
# The HTML theme for the epub output. Since the default themes are not
# optimized for small screen space, using the same theme for HTML and epub
# output is usually not wise. This defaults to 'epub', a theme designed to save
# visual space.
#
# epub_theme = 'epub'
# The language of the text. It defaults to the language option
# or 'en' if the language is not set.
#
# epub_language = ''
# The scheme of the identifier. Typical schemes are ISBN or URL.
# epub_scheme = ''
# The unique identifier of the text. This can be a ISBN number
# or the project homepage.
#
# epub_identifier = ''
# A unique identification for the text.
#
# epub_uid = ''
# A tuple containing the cover image and cover page html template filenames.
#
# epub_cover = ()
# A sequence of (type, uri, title) tuples for the guide element of content.opf.
#
# epub_guide = ()
# HTML files that should be inserted before the pages created by sphinx.
# The format is a list of tuples containing the path and title.
#
# epub_pre_files = []
# HTML files that should be inserted after the pages created by sphinx.
# The format is a list of tuples containing the path and title.
#
# epub_post_files = []
# A list of files that should not be packed into the epub file.
epub_exclude_files = ['search.html']
# The depth of the table of contents in toc.ncx.
#
# epub_tocdepth = 3
# Allow duplicate toc entries.
#
# epub_tocdup = True
# Choose between 'default' and 'includehidden'.
#
# epub_tocscope = 'default'
# Fix unsupported image types using the Pillow.
#
# epub_fix_images = False
# Scale large images.
#
# epub_max_image_width = 0
# How to display URL addresses: 'footnote', 'no', or 'inline'.
#
# epub_show_urls = 'inline'
# If false, no index is generated.
#
# epub_use_index = True

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Developer Information
`````````````````````
Learn how to build modules of your own in any language, and also how to extend Ansible through several kinds of plugins. Explore Ansible's Python API and write Python plugins to integrate with other solutions in your environment.
.. toctree::
:maxdepth: 1
developing_api
developing_inventory
developing_modules
developing_plugins
developing_core
developing_test_pr
developing_releases
Developers will also likely be interested in the fully-discoverable in :doc:`tower`. It's great for embedding Ansible in all manner of applications.

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Python API
==========
.. contents:: Topics
Please note that while we make this API available it is not intended for direct consumption, it is here
for the support of the Ansible command line tools. We try not to make breaking changes but we reserve the
right to do so at any time if it makes sense for the Ansible toolset.
The following documentation is provided for those that still want to use the API directly, but be mindful this is not something the Ansible team supports.
There are several interesting ways to use Ansible from an API perspective. You can use
the Ansible python API to control nodes, you can extend Ansible to respond to various python events, you can
write various plugins, and you can plug in inventory data from external data sources. This document
covers the execution and Playbook API at a basic level.
If you are looking to use Ansible programmatically from something other than Python, trigger events asynchronously,
or have access control and logging demands, take a look at :doc:`tower`
as it has a very nice REST API that provides all of these things at a higher level.
Ansible is written in its own API so you have a considerable amount of power across the board.
This chapter discusses the Python API.
.. _python_api:
The Python API is very powerful, and is how the all the ansible CLI tools are implemented.
In version 2.0 the core ansible got rewritten and the API was mostly rewritten.
.. note:: Ansible relies on forking processes, as such the API is not thread safe.
.. _python_api_20:
Python API 2.0
--------------
In 2.0 things get a bit more complicated to start, but you end up with much more discrete and readable classes::
#!/usr/bin/env python
import json
from collections import namedtuple
from ansible.parsing.dataloader import DataLoader
from ansible.vars import VariableManager
from ansible.inventory import Inventory
from ansible.playbook.play import Play
from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.plugins.callback import CallbackBase
class ResultCallback(CallbackBase):
"""A sample callback plugin used for performing an action as results come in
If you want to collect all results into a single object for processing at
the end of the execution, look into utilizing the ``json`` callback plugin
or writing your own custom callback plugin
"""
def v2_runner_on_ok(self, result, **kwargs):
"""Print a json representation of the result
This method could store the result in an instance attribute for retrieval later
"""
host = result._host
print json.dumps({host.name: result._result}, indent=4)
Options = namedtuple('Options', ['connection', 'module_path', 'forks', 'become', 'become_method', 'become_user', 'check'])
# initialize needed objects
variable_manager = VariableManager()
loader = DataLoader()
options = Options(connection='local', module_path='/path/to/mymodules', forks=100, become=None, become_method=None, become_user=None, check=False)
passwords = dict(vault_pass='secret')
# Instantiate our ResultCallback for handling results as they come in
results_callback = ResultCallback()
# create inventory and pass to var manager
inventory = Inventory(loader=loader, variable_manager=variable_manager, host_list='localhost')
variable_manager.set_inventory(inventory)
# create play with tasks
play_source = dict(
name = "Ansible Play",
hosts = 'localhost',
gather_facts = 'no',
tasks = [
dict(action=dict(module='shell', args='ls'), register='shell_out'),
dict(action=dict(module='debug', args=dict(msg='{{shell_out.stdout}}')))
]
)
play = Play().load(play_source, variable_manager=variable_manager, loader=loader)
# actually run it
tqm = None
try:
tqm = TaskQueueManager(
inventory=inventory,
variable_manager=variable_manager,
loader=loader,
options=options,
passwords=passwords,
stdout_callback=results_callback, # Use our custom callback instead of the ``default`` callback plugin
)
result = tqm.run(play)
finally:
if tqm is not None:
tqm.cleanup()
.. _python_api_old:
Python API pre 2.0
------------------
It's pretty simple::
import ansible.runner
runner = ansible.runner.Runner(
module_name='ping',
module_args='',
pattern='web*',
forks=10
)
datastructure = runner.run()
The run method returns results per host, grouped by whether they
could be contacted or not. Return types are module specific, as
expressed in the :doc:`modules` documentation.::
{
"dark" : {
"web1.example.com" : "failure message"
},
"contacted" : {
"web2.example.com" : 1
}
}
A module can return any type of JSON data it wants, so Ansible can
be used as a framework to rapidly build powerful applications and scripts.
.. _detailed_api_old_example:
Detailed API Example
````````````````````
The following script prints out the uptime information for all hosts::
#!/usr/bin/python
import ansible.runner
import sys
# construct the ansible runner and execute on all hosts
results = ansible.runner.Runner(
pattern='*', forks=10,
module_name='command', module_args='/usr/bin/uptime',
).run()
if results is None:
print "No hosts found"
sys.exit(1)
print "UP ***********"
for (hostname, result) in results['contacted'].items():
if not 'failed' in result:
print "%s >>> %s" % (hostname, result['stdout'])
print "FAILED *******"
for (hostname, result) in results['contacted'].items():
if 'failed' in result:
print "%s >>> %s" % (hostname, result['msg'])
print "DOWN *********"
for (hostname, result) in results['dark'].items():
print "%s >>> %s" % (hostname, result)
Advanced programmers may also wish to read the source to ansible itself,
for it uses the API (with all available options) to implement the ``ansible``
command line tools (``lib/ansible/cli/``).
.. seealso::
:doc:`developing_inventory`
Developing dynamic inventory integrations
:doc:`developing_modules`
How to develop modules
:doc:`developing_plugins`
How to develop plugins
`Development Mailing List <http://groups.google.com/group/ansible-devel>`_
Mailing list for development topics
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Developing the Ansible Core Engine
==================================
Although many of the pieces of the Ansible Core Engine are plugins that can be
swapped out via playbook directives or configuration, there are still pieces
of the Engine that are not modular. The documents here give insight into how
those pieces work together.
.. toctree::
:maxdepth: 1
developing_program_flow_modules
.. seealso::
:doc:`developing_api`
Learn about the Python API for task execution
:doc:`developing_plugins`
Learn about developing plugins
`Mailing List <http://groups.google.com/group/ansible-devel>`_
The development mailing list
`irc.freenode.net <http://irc.freenode.net>`_
#ansible-devel IRC chat channel

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Developing Dynamic Inventory Sources
====================================
.. contents:: Topics
:local:
As described in :doc:`intro_dynamic_inventory`, ansible can pull inventory information from dynamic sources, including cloud sources.
How do we write a new one?
Simple! We just create a script or program that can print JSON in the right format when fed the proper arguments.
You can do this in any language.
.. _inventory_script_conventions:
Script Conventions
``````````````````
When the external node script is called with the single argument ``--list``, the script must output a JSON encoded hash/dictionary of all the groups to be managed to stdout. Each group's value should be either a hash/dictionary containing a list of each host/IP, potential child groups, and potential group variables, or simply a list of host/IP addresses, like so::
{
"databases" : {
"hosts" : [ "host1.example.com", "host2.example.com" ],
"vars" : {
"a" : true
}
},
"webservers" : [ "host2.example.com", "host3.example.com" ],
"atlanta" : {
"hosts" : [ "host1.example.com", "host4.example.com", "host5.example.com" ],
"vars" : {
"b" : false
},
"children": [ "marietta", "5points" ]
},
"marietta" : [ "host6.example.com" ],
"5points" : [ "host7.example.com" ]
}
.. versionadded:: 1.0
Before version 1.0, each group could only have a list of hostnames/IP addresses, like the webservers, marietta, and 5points groups above.
When called with the arguments ``--host <hostname>`` (where <hostname> is a host from above), the script must print either an empty JSON
hash/dictionary, or a hash/dictionary of variables to make available to templates and playbooks. Printing variables is optional,
if the script does not wish to do this, printing an empty hash/dictionary is the way to go::
{
"favcolor" : "red",
"ntpserver" : "wolf.example.com",
"monitoring" : "pack.example.com"
}
.. _inventory_script_tuning:
Tuning the External Inventory Script
````````````````````````````````````
.. versionadded:: 1.3
The stock inventory script system detailed above works for all versions of Ansible, but calling
``--host`` for every host can be rather expensive, especially if it involves expensive API calls to
a remote subsystem. In Ansible
1.3 or later, if the inventory script returns a top level element called "_meta", it is possible
to return all of the host variables in one inventory script call. When this meta element contains
a value for "hostvars", the inventory script will not be invoked with ``--host`` for each host. This
results in a significant performance increase for large numbers of hosts, and also makes client
side caching easier to implement for the inventory script.
The data to be added to the top level JSON dictionary looks like this::
{
# results of inventory script as above go here
# ...
"_meta" : {
"hostvars" : {
"moocow.example.com" : { "asdf" : 1234 },
"llama.example.com" : { "asdf" : 5678 }
}
}
}
.. seealso::
:doc:`developing_api`
Python API to Playbooks and Ad Hoc Task Execution
:doc:`developing_modules`
How to develop modules
:doc:`developing_plugins`
How to develop plugins
`Ansible Tower <http://ansible.com/ansible-tower>`_
REST API endpoint and GUI for Ansible, syncs with dynamic inventory
`Development Mailing List <http://groups.google.com/group/ansible-devel>`_
Mailing list for development topics
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Appendix: Module Utilities
``````````````````````````
Ansible provides a number of module utilities that provide helper functions that you can use when developing your own modules. The `basic.py` module utility provides the main entry point for accessing the Ansible library, and all Ansible modules must, at minimum, import from basic.py::
from ansible.module_utils.basic import *
The following is a list of module_utils files and a general description. The module utility source code lives in the `./lib/module_utils` directory under your main Ansible path - for more details on any specific module utility, please see the source code.
- a10.py - Utilities used by the a10_server module to manage A10 Networks devices.
- api.py - Adds shared support for generic API modules.
- asa.py - Module support utilities for managing Cisco ASA network devices.
- azure_rm_common.py - Definitions and utilities for Microsoft Azure Resource Manager template deployments.
- basic.py - General definitions and helper utilities for Ansible modules.
- cloudstack.py - Utilities for CloudStack modules.
- database.py - Miscellaneous helper functions for PostGRES and MySQL
- docker_common.py - Definitions and helper utilities for modules working with Docker.
- ec2.py - Definitions and utilities for modules working with Amazon EC2
- eos.py - Helper functions for modules working with EOS networking devices.
- f5.py - Helper functions for modules working with F5 networking devices.
- facts.py - Helper functions for modules that return facts.
- gce.py - Definitions and helper functions for modules that work with Google Compute Engine resources.
- ios.py - Definitions and helper functions for modules that manage Cisco IOS networking devices
- iosxr.py - Definitions and helper functions for modules that manage Cisco IOS-XR networking devices
- ismount.py - Contains single helper function that fixes os.path.ismount
- junos.py - Definitions and helper functions for modules that manage Junos networking devices
- known_hosts.py - utilities for working with known_hosts file
- mysql.py - Allows modules to connect to a MySQL instance
- netcfg.py - Configuration utility functions for use by networking modules
- netcmd.py - Defines commands and comparison operators for use in networking modules
- network.py - Functions for running commands on networking devices
- nxos.py - Contains definitions and helper functions specific to Cisco NXOS networking devices
- openstack.py - Utilities for modules that work with Openstack instances.
- openswitch.py - Definitions and helper functions for modules that manage OpenSwitch devices
- powershell.ps1 - Utilities for working with Microsoft Windows clients
- pycompat24.py - Exception workaround for python 2.4
- rax.py - Definitions and helper functions for modules that work with Rackspace resources.
- redhat.py - Functions for modules that manage Red Hat Network registration and subscriptions
- service.py - Contains utilities to enable modules to work with Linux services (placeholder, not in use).
- shell.py - Functions to allow modules to create shells and work with shell commands
- six.py - Module utils for working with the Six python 2 and 3 compatibility library
- splitter.py - String splitting and manipulation utilities for working with Jinja2 templates
- urls.py - Utilities for working with http and https requests
- vca.py - Contains utilities for modules that work with VMware vCloud Air
- vmware.py - Contains utilities for modules that work with VMware vSphere VMs
- vyos.py - Definitions and functions for working with VyOS networking

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Developing Modules
==================
.. contents:: Topics
Ansible modules are reusable, standalone scripts that can be used by the Ansible API,
or by the :command:`ansible` or :command:`ansible-playbook` programs. They
return information to ansible by printing a JSON string to stdout before
exiting. They take arguments in in one of several ways which we'll go into
as we work through this tutorial.
See :doc:`modules` for a list of various ones developed in core.
Modules can be written in any language and are found in the path specified
by :envvar:`ANSIBLE_LIBRARY` or the ``--module-path`` command line option.
By default, everything that ships with Ansible is pulled from its source tree, but
additional paths can be added.
The directory :file:`./library`, alongside your top level :term:`playbooks`, is also automatically
added as a search directory.
Should you develop an interesting Ansible module, consider sending a pull request to the
`modules-extras project <https://github.com/ansible/ansible-modules-extras>`_. There's also a core
repo for more established and widely used modules. "Extras" modules may be promoted to core periodically,
but there's no fundamental difference in the end - both ship with Ansible, all in one package, regardless
of how you acquire Ansible.
.. _module_dev_tutorial:
Tutorial
````````
Let's build a very-basic module to get and set the system time. For starters, let's build
a module that just outputs the current time.
We are going to use Python here but any language is possible. Only File I/O and outputting to standard
out are required. So, bash, C++, clojure, Python, Ruby, whatever you want
is fine.
Now Python Ansible modules contain some extremely powerful shortcuts (that all the core modules use)
but first we are going to build a module the very hard way. The reason we do this is because modules
written in any language OTHER than Python are going to have to do exactly this. We'll show the easy
way later.
So, here's an example. You would never really need to build a module to set the system time,
the 'command' module could already be used to do this.
Reading the modules that come with Ansible (linked above) is a great way to learn how to write
modules. Keep in mind, though, that some modules in Ansible's source tree are internalisms,
so look at :ref:`service` or :ref:`yum`, and don't stare too close into things like ``async_wrapper`` or
you'll turn to stone. Nobody ever executes ``async_wrapper`` directly.
Ok, let's get going with an example. We'll use Python. For starters, save this as a file named :file:`timetest.py`::
#!/usr/bin/python
import datetime
import json
date = str(datetime.datetime.now())
print json.dumps({
"time" : date
})
.. _module_testing:
Testing Modules
````````````````
There's a useful test script in the source checkout for Ansible::
git clone git://github.com/ansible/ansible.git --recursive
source ansible/hacking/env-setup
For instructions on setting up Ansible from source, please see
:doc:`intro_installation`.
Let's run the script you just wrote with that::
ansible/hacking/test-module -m ./timetest.py
You should see output that looks something like this::
{'time': '2012-03-14 22:13:48.539183'}
If you did not, you might have a typo in your module, so recheck it and try again.
.. _reading_input:
Reading Input
`````````````
Let's modify the module to allow setting the current time. We'll do this by seeing
if a key value pair in the form `time=<string>` is passed in to the module.
Ansible internally saves arguments to an arguments file. So we must read the file
and parse it. The arguments file is just a string, so any form of arguments are legal.
Here we'll do some basic parsing to treat the input as key=value.
The example usage we are trying to achieve to set the time is::
time time="March 14 22:10"
If no time parameter is set, we'll just leave the time as is and return the current time.
.. note::
This is obviously an unrealistic idea for a module. You'd most likely just
use the command module. However, it makes for a decent tutorial.
Let's look at the code. Read the comments as we'll explain as we go. Note that this
is highly verbose because it's intended as an educational example. You can write modules
a lot shorter than this::
#!/usr/bin/python
# import some python modules that we'll use. These are all
# available in Python's core
import datetime
import sys
import json
import os
import shlex
# read the argument string from the arguments file
args_file = sys.argv[1]
args_data = file(args_file).read()
# For this module, we're going to do key=value style arguments.
# Modules can choose to receive json instead by adding the string:
# WANT_JSON
# Somewhere in the file.
# Modules can also take free-form arguments instead of key-value or json
# but this is not recommended.
arguments = shlex.split(args_data)
for arg in arguments:
# ignore any arguments without an equals in it
if "=" in arg:
(key, value) = arg.split("=")
# if setting the time, the key 'time'
# will contain the value we want to set the time to
if key == "time":
# now we'll affect the change. Many modules
# will strive to be idempotent, generally
# by not performing any actions if the current
# state is the same as the desired state.
# See 'service' or 'yum' in the main git tree
# for an illustrative example.
rc = os.system("date -s \"%s\"" % value)
# always handle all possible errors
#
# when returning a failure, include 'failed'
# in the return data, and explain the failure
# in 'msg'. Both of these conventions are
# required however additional keys and values
# can be added.
if rc != 0:
print json.dumps({
"failed" : True,
"msg" : "failed setting the time"
})
sys.exit(1)
# when things do not fail, we do not
# have any restrictions on what kinds of
# data are returned, but it's always a
# good idea to include whether or not
# a change was made, as that will allow
# notifiers to be used in playbooks.
date = str(datetime.datetime.now())
print json.dumps({
"time" : date,
"changed" : True
})
sys.exit(0)
# if no parameters are sent, the module may or
# may not error out, this one will just
# return the time
date = str(datetime.datetime.now())
print json.dumps({
"time" : date
})
Let's test that module::
ansible/hacking/test-module -m ./timetest.py -a "time=\"March 14 12:23\""
This should return something like::
{"changed": true, "time": "2012-03-14 12:23:00.000307"}
.. _binary_module_reading_input:
Binary Modules Input
++++++++++++++++++++
Support for binary modules was added in Ansible 2.2. When Ansible detects a binary module, it will proceed to
supply the argument input as a file on ``argv[1]`` that is formatted as JSON. The JSON contents of that file
would resemble something similar to the following payload for a module accepting the same arguments as the
``ping`` module::
{
"data": "pong",
"_ansible_verbosity": 4,
"_ansible_diff": false,
"_ansible_debug": false,
"_ansible_check_mode": false,
"_ansible_no_log": false
}
.. _module_provided_facts:
Module Provided 'Facts'
````````````````````````
The :ref:`setup` module that ships with Ansible provides many variables about a system that can be used in playbooks
and templates. However, it's possible to also add your own facts without modifying the system module. To do
this, just have the module return a `ansible_facts` key, like so, along with other return data::
{
"changed" : True,
"rc" : 5,
"ansible_facts" : {
"leptons" : 5000,
"colors" : {
"red" : "FF0000",
"white" : "FFFFFF"
}
}
}
These 'facts' will be available to all statements called after that module (but not before) in the playbook.
A good idea might be to make a module called 'site_facts' and always call it at the top of each playbook, though
we're always open to improving the selection of core facts in Ansible as well.
Returning a new fact from a python module could be done like::
module.exit_json(msg=message, ansible_facts=dict(leptons=5000, colors=my_colors))
.. _common_module_boilerplate:
Common Module Boilerplate
`````````````````````````
As mentioned, if you are writing a module in Python, there are some very powerful shortcuts you can use.
Modules are still transferred as one file, but an arguments file is no longer needed, so these are not
only shorter in terms of code, they are actually FASTER in terms of execution time.
Rather than mention these here, the best way to learn is to read some of the `source of the modules <https://github.com/ansible/ansible-modules-core>`_ that come with Ansible.
The 'group' and 'user' modules are reasonably non-trivial and showcase what this looks like.
Key parts include always importing the boilerplate code from
:mod:`ansible.module_utils.basic` like this::
from ansible.module_utils.basic import AnsibleModule
if __name__ == '__main__':
main()
.. note::
Prior to Ansible-2.1.0, importing only what you used from
:mod:`ansible.module_utils.basic` did not work. You needed to use
a wildcard import like this::
from ansible.module_utils.basic import *
And instantiating the module class like::
def main():
module = AnsibleModule(
argument_spec = dict(
state = dict(default='present', choices=['present', 'absent']),
name = dict(required=True),
enabled = dict(required=True, type='bool'),
something = dict(aliases=['whatever'])
)
)
The :class:`AnsibleModule` provides lots of common code for handling returns, parses your arguments
for you, and allows you to check inputs.
Successful returns are made like this::
module.exit_json(changed=True, something_else=12345)
And failures are just as simple (where `msg` is a required parameter to explain the error)::
module.fail_json(msg="Something fatal happened")
There are also other useful functions in the module class, such as :func:`module.sha1(path)`. See
:file:`lib/ansible/module_utils/basic.py` in the source checkout for implementation details.
Again, modules developed this way are best tested with the :file:`hacking/test-module` script in the git
source checkout. Because of the magic involved, this is really the only way the scripts
can function outside of Ansible.
If submitting a module to Ansible's core code, which we encourage, use of
:class:`AnsibleModule` is required.
.. _developing_for_check_mode:
Check Mode
``````````
.. versionadded:: 1.1
Modules may optionally support check mode. If the user runs Ansible in check
mode, the module should try to predict whether changes will occur.
For your module to support check mode, you must pass ``supports_check_mode=True``
when instantiating the AnsibleModule object. The AnsibleModule.check_mode attribute
will evaluate to True when check mode is enabled. For example::
module = AnsibleModule(
argument_spec = dict(...),
supports_check_mode=True
)
if module.check_mode:
# Check if any changes would be made but don't actually make those changes
module.exit_json(changed=check_if_system_state_would_be_changed())
Remember that, as module developer, you are responsible for ensuring that no
system state is altered when the user enables check mode.
If your module does not support check mode, when the user runs Ansible in check
mode, your module will simply be skipped.
.. _module_dev_pitfalls:
Common Pitfalls
```````````````
You should also never do this in a module::
print "some status message"
Because the output is supposed to be valid JSON.
Modules must not output anything on standard error, because the system will merge
standard out with standard error and prevent the JSON from parsing. Capturing standard
error and returning it as a variable in the JSON on standard out is fine, and is, in fact,
how the command module is implemented.
If a module returns stderr or otherwise fails to produce valid JSON, the actual output
will still be shown in Ansible, but the command will not succeed.
Always use the hacking/test-module script when developing modules and it will warn
you about these kind of things.
.. _module_dev_conventions:
Conventions/Recommendations
```````````````````````````
As a reminder from the example code above, here are some basic conventions
and guidelines:
* If the module is addressing an object, the parameter for that object should be called 'name' whenever possible, or accept 'name' as an alias.
* If you have a company module that returns facts specific to your installations, a good name for this module is `site_facts`.
* Modules accepting boolean status should generally accept 'yes', 'no', 'true', 'false', or anything else a user may likely throw at them. The AnsibleModule common code supports this with "type='bool'".
* Include a minimum of dependencies if possible. If there are dependencies, document them at the top of the module file, and have the module raise JSON error messages when the import fails.
* Modules must be self-contained in one file to be auto-transferred by ansible.
* If packaging modules in an RPM, they only need to be installed on the control machine and should be dropped into /usr/share/ansible. This is entirely optional and up to you.
* Modules must output valid JSON only. The toplevel return type must be a hash (dictionary) although they can be nested. Lists or simple scalar values are not supported, though they can be trivially contained inside a dictionary.
* In the event of failure, a key of 'failed' should be included, along with a string explanation in 'msg'. Modules that raise tracebacks (stacktraces) are generally considered 'poor' modules, though Ansible can deal with these returns and will automatically convert anything unparseable into a failed result. If you are using the AnsibleModule common Python code, the 'failed' element will be included for you automatically when you call 'fail_json'.
* Return codes from modules are actually not significant, but continue on with 0=success and non-zero=failure for reasons of future proofing.
* As results from many hosts will be aggregated at once, modules should return only relevant output. Returning the entire contents of a log file is generally bad form.
.. _module_documenting:
Documenting Your Module
```````````````````````
All modules included in the CORE distribution must have a
``DOCUMENTATION`` string. This string MUST be a valid YAML document
which conforms to the schema defined below. You may find it easier to
start writing your ``DOCUMENTATION`` string in an editor with YAML
syntax highlighting before you include it in your Python file.
.. _module_doc_example:
Example
+++++++
See an example documentation string in the checkout under `examples/DOCUMENTATION.yml <https://github.com/ansible/ansible/blob/devel/examples/DOCUMENTATION.yml>`_.
Include it in your module file like this::
#!/usr/bin/python
# Copyright header....
DOCUMENTATION = '''
---
module: modulename
short_description: This is a sentence describing the module
# ... snip ...
'''
If an argument takes both C(True)/C(False) and C(Yes)/C(No), the documentation should use C(True) and C(False).
The ``description``, and ``notes`` fields
support formatting with some special macros.
These formatting functions are ``U()``, ``M()``, ``I()``, and ``C()``
for URL, module, italic, and constant-width respectively. It is suggested
to use ``C()`` for file and option names, and ``I()`` when referencing
parameters; module names should be specified as ``M(module)``.
Examples should be written in YAML format in plain text in an
``EXAMPLES`` string within the module like this::
EXAMPLES = '''
- modulename:
opt1: arg1
opt2: arg2
'''
The EXAMPLES section, just like the documentation section, is required in
all module pull requests for new modules.
The RETURN section documents what the module returns. For each value returned,
provide a ``description``, in what circumstances the value is ``returned``,
the ``type`` of the value and a ``sample``. For example, from
the ``copy`` module::
RETURN = '''
dest:
description: destination file/path
returned: success
type: string
sample: "/path/to/file.txt"
src:
description: source file used for the copy on the target machine
returned: changed
type: string
sample: "/home/httpd/.ansible/tmp/ansible-tmp-1423796390.97-147729857856000/source"
md5sum:
description: md5 checksum of the file after running copy
returned: when supported
type: string
sample: "2a5aeecc61dc98c4d780b14b330e3282"
...
'''
.. _module_dev_testing:
Building & Testing
++++++++++++++++++
Put your completed module file into the 'library' directory and then
run the command: ``make webdocs``. The new 'modules.html' file will be
built and appear in the 'docsite/' directory.
.. tip::
If you're having a problem with the syntax of your YAML you can
validate it on the `YAML Lint <http://www.yamllint.com/>`_ website.
.. tip::
You can set the environment variable ANSIBLE_KEEP_REMOTE_FILES=1 on the controlling host to prevent ansible from
deleting the remote files so you can debug your module.
.. _debugging_ansiblemodule_based_modules:
Debugging AnsibleModule-based modules
`````````````````````````````````````
.. tip::
If you're using the :file:`hacking/test-module` script then most of this
is taken care of for you. If you need to do some debugging of the module
on the remote machine that the module will actually run on or when the
module is used in a playbook then you may need to use this information
instead of relying on test-module.
Starting with Ansible-2.1.0, AnsibleModule-based modules are put together as
a zip file consisting of the module file and the various python module
boilerplate inside of a wrapper script instead of as a single file with all of
the code concatenated together. Without some help, this can be harder to
debug as the file needs to be extracted from the wrapper in order to see
what's actually going on in the module. Luckily the wrapper script provides
some helper methods to do just that.
If you are using Ansible with the :envvar:`ANSIBLE_KEEP_REMOTE_FILES`
environment variables to keep the remote module file, here's a sample of how
your debugging session will start::
$ ANSIBLE_KEEP_REMOTE_FILES=1 ansible localhost -m ping -a 'data=debugging_session' -vvv
<127.0.0.1> ESTABLISH LOCAL CONNECTION FOR USER: badger
<127.0.0.1> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595 `" && echo "` echo $HOME/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595 `" )'
<127.0.0.1> PUT /var/tmp/tmpjdbJ1w TO /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping
<127.0.0.1> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping'
localhost | SUCCESS => {
"changed": false,
"invocation": {
"module_args": {
"data": "debugging_session"
},
"module_name": "ping"
},
"ping": "debugging_session"
}
Setting :envvar:`ANSIBLE_KEEP_REMOTE_FILES` to ``1`` tells Ansible to keep the
remote module files instead of deleting them after the module finishes
executing. Giving Ansible the ``-vvv`` optin makes Ansible more verbose.
That way it prints the file name of the temporary module file for you to see.
If you want to examine the wrapper file you can. It will show a small python
script with a large, base64 encoded string. The string contains the module
that is going to be executed. Run the wrapper's explode command to turn the
string into some python files that you can work with::
$ python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping explode
Module expanded into:
/home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/debug_dir
When you look into the debug_dir you'll see a directory structure like this::
├── ansible_module_ping.py
├── args
└── ansible
├── __init__.py
└── module_utils
├── basic.py
└── __init__.py
* :file:`ansible_module_ping.py` is the code for the module itself. The name
is based on the name of the module with a prefix so that we don't clash with
any other python module names. You can modify this code to see what effect
it would have on your module.
* The :file:`args` file contains a JSON string. The string is a dictionary
containing the module arguments and other variables that Ansible passes into
the module to change it's behaviour. If you want to modify the parameters
that are passed to the module, this is the file to do it in.
* The :file:`ansible` directory contains code from
:mod:`ansible.module_utils` that is used by the module. Ansible includes
files for any :`module:`ansible.module_utils` imports in the module but not
no files from any other module. So if your module uses
:mod:`ansible.module_utils.url` Ansible will include it for you, but if
your module includes :mod:`requests` then you'll have to make sure that
the python requests library is installed on the system before running the
module. You can modify files in this directory if you suspect that the
module is having a problem in some of this boilerplate code rather than in
the module code you have written.
Once you edit the code or arguments in the exploded tree you need some way to
run it. There's a separate wrapper subcommand for this::
$ python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping execute
{"invocation": {"module_args": {"data": "debugging_session"}}, "changed": false, "ping": "debugging_session"}
This subcommand takes care of setting the PYTHONPATH to use the exploded
:file:`debug_dir/ansible/module_utils` directory and invoking the script using
the arguments in the :file:`args` file. You can continue to run it like this
until you understand the problem. Then you can copy it back into your real
module file and test that the real module works via :command:`ansible` or
:command:`ansible-playbook`.
.. note::
The wrapper provides one more subcommand, ``excommunicate``. This
subcommand is very similar to ``execute`` in that it invokes the exploded
module on the arguments in the :file:`args`. The way it does this is
different, however. ``excommunicate`` imports the :func:`main`
function from the module and then calls that. This makes excommunicate
execute the module in the wrapper's process. This may be useful for
running the module under some graphical debuggers but it is very different
from the way the module is executed by Ansible itself. Some modules may
not work with ``excommunicate`` or may behave differently than when used
with Ansible normally. Those are not bugs in the module; they're
limitations of ``excommunicate``. Use at your own risk.
.. _module_paths:
Module Paths
````````````
If you are having trouble getting your module "found" by ansible, be
sure it is in the :envvar:`ANSIBLE_LIBRARY` environment variable.
If you have a fork of one of the ansible module projects, do something like this::
ANSIBLE_LIBRARY=~/ansible-modules-core:~/ansible-modules-extras
And this will make the items in your fork be loaded ahead of what ships with Ansible. Just be sure
to make sure you're not reporting bugs on versions from your fork!
To be safe, if you're working on a variant on something in Ansible's normal distribution, it's not
a bad idea to give it a new name while you are working on it, to be sure you know you're pulling
your version.
.. _module_contribution:
Getting Your Module Into Ansible
````````````````````````````````
High-quality modules with minimal dependencies
can be included in Ansible, but modules (just due to the programming
preferences of the developers) will need to be implemented in Python and use
the AnsibleModule common code, and should generally use consistent arguments with the rest of
the program. Stop by the mailing list to inquire about requirements if you like, and submit
a github pull request to the `extras <https://github.com/ansible/ansible-modules-extras>`_ project.
Included modules will ship with ansible, and also have a chance to be promoted to 'core' status, which
gives them slightly higher development priority (though they'll work in exactly the same way).
Module checklist
````````````````
The following checklist items are important guidelines for people who want to contribute to the development of modules to Ansible on GitHub. Please read the guidelines before you submit your PR/proposal.
* The shebang must always be ``#!/usr/bin/python``. This allows ``ansible_python_interpreter`` to work
* Modules must be written to support Python 2.4. If this is not possible, required minimum python version and rationale should be explained in the requirements section in ``DOCUMENTATION``. This minimum requirement will be advanced to Python-2.6 in Ansible-2.4.
* Modules must be written to use proper Python-3 syntax. At some point in the future we'll come up with rules for running on Python-3 but we're not there yet. See :doc:`developing_modules_python3` for help on how to do this.
* Modules must have a metadata section. For the vast majority of new modules,
the metadata should look exactly like this::
ANSIBLE_METADATA = {'status': ['preview'],
'supported_by': 'community',
'version': '1.0'}
The complete module metadata specification is here: https://github.com/ansible/proposals/issues/30
* Documentation: Make sure it exists
* Module documentation should briefly and accurately define what each module and option does, and how it works with others in the underlying system. Documentation should be written for broad audience--readable both by experts and non-experts. This documentation is not meant to teach a total novice, but it also should not be reserved for the Illuminati (hard balance).
* If an argument takes both C(True)/C(False) and C(Yes)/C(No), the documentation should use C(True) and C(False).
* Descriptions should always start with a capital letter and end with a full stop. Consistency always helps.
* The `required` setting is only required when true, otherwise it is assumed to be false.
* If `required` is false/missing, `default` may be specified (assumed 'null' if missing). Ensure that the default parameter in docs matches default parameter in code.
* Documenting `default` is not needed for `required: true`.
* Remove unnecessary doc like `aliases: []` or `choices: []`.
* Do not use Boolean values in a choice list . For example, in the list `choices: ['no', 'verify', 'always]`, 'no' will be interpreted as a Boolean value (you can check basic.py for BOOLEANS_* constants to see the full list of Boolean keywords). If your option actually is a boolean, just use `type=bool`; there is no need to populate 'choices'.
* For new modules or options in a module add version_added. The version should match the value of the current development version and is a string (not a float), so be sure to enclose it in quotes.
* Verify that arguments in doc and module spec dict are identical.
* For password / secret arguments no_log=True should be set.
* Requirements should be documented, using the `requirements=[]` field.
* Author should be set, with their name and their github id, at the least.
* Ensure that you make use of U() for urls, C() for files and options, I() for params, M() for modules.
* If an optional parameter is sometimes required this need to be reflected in the documentation, e.g. "Required when C(state=present)."
* Verify that a GPL 3 License header is included.
* Does module use check_mode? Could it be modified to use it? Document it. Documentation is everyone's friend.
* Examples--include them whenever possible and make sure they are reproducible.
* Document the return structure of the module. Refer to :ref:`common_return_values` and :ref:`module_documenting` for additional information.
* Predictable user interface: This is a particularly important section as it is also an area where we need significant improvements.
* Name consistency across modules (weve gotten better at this, but we still have many deviations).
* Declarative operation (not CRUD)--this makes it easy for a user not to care what the existing state is, just about the final state. ``started/stopped``, ``present/absent``--don't overload options too much. It is preferable to add a new, simple option than to add choices/states that don't fit with existing ones.
* Keep options small, having them take large data structures might save us a few tasks, but adds a complex requirement that we cannot easily validate before passing on to the module.
* Allow an "expert mode". This may sound like the absolute opposite of the previous one, but it is always best to let expert users deal with complex data. This requires different modules in some cases, so that you end up having one (1) expert module and several 'piecemeal' ones (ec2_vpc_net?). The reason for this is not, as many users express, because it allows a single task and keeps plays small (which just moves the data complexity into vars files, leaving you with a slightly different structure in another YAML file). It does, however, allow for a more 'atomic' operation against the underlying APIs and services.
* Informative responses: Please note, that for >= 2.0, it is required that return data to be documented.
* Always return useful data, even when there is no change.
* Be consistent about returns (some modules are too random), unless it is detrimental to the state/action.
* Make returns reusable--most of the time you don't want to read it, but you do want to process it and re-purpose it.
* Return diff if in diff mode. This is not required for all modules, as it won't make sense for certain ones, but please attempt to include this when applicable).
* Code: This applies to all code in general, but often seems to be missing from modules, so please keep the following in mind as you work.
* Validate upfront--fail fast and return useful and clear error messages.
* Defensive programming--modules should be designed simply enough that this should be easy. Modules should always handle errors gracefully and avoid direct stacktraces. Ansible deals with this better in 2.0 and returns them in the results.
* Fail predictably--if we must fail, do it in a way that is the most expected. Either mimic the underlying tool or the general way the system works.
* Modules should not do the job of other modules, that is what roles are for. Less magic is more.
* Don't reinvent the wheel. Part of the problem is that code sharing is not that easy nor documented, we also need to expand our base functions to provide common patterns (retry, throttling, etc).
* Support check mode. This is not required for all modules, as it won't make sense for certain ones, but please attempt to include this when applicable). For more information, refer to :ref:`check_mode_drift` and :ref:`check_mode_dry`.
* Exceptions: The module must handle them. (exceptions are bugs)
* Give out useful messages on what you were doing and you can add the exception message to that.
* Avoid catchall exceptions, they are not very useful unless the underlying API gives very good error messages pertaining the attempted action.
* Module-dependent guidelines: Additional module guidelines may exist for certain families of modules.
* Be sure to check out the modules themselves for additional information.
* Amazon: https://github.com/ansible/ansible-modules-extras/blob/devel/cloud/amazon/GUIDELINES.md
* Modules should make use of the "extends_documentation_fragment" to ensure documentation available. For example, the AWS module should include::
extends_documentation_fragment:
- aws
- ec2
* The module must not use sys.exit() --> use fail_json() from the module object.
* Import custom packages in try/except and handled with fail_json() in main() e.g.::
try:
import foo
HAS_LIB=True
except:
HAS_LIB=False
* The return structure should be consistent, even if NA/None are used for keys normally returned under other options.
* Are module actions idempotent? If not document in the descriptions or the notes.
* Import ``ansible.module_utils`` code in the same place as you import other libraries. In older code, this was done at the bottom of the file but that's no longer needed.
* Do not use wildcards for importing other python modules (ex: ``from ansible.module_utils.basic import *``). This used to be required for code imported from ``ansible.module_utils`` but, from Ansible-2.1 onwards, it's just an outdated and bad practice.
* The module must have a `main` function that wraps the normal execution.
* Call your :func:`main` from a conditional so that it would be possible to
import them into unittests in the future example::
if __name__ == '__main__':
main()
* Try to normalize parameters with other modules, you can have aliases for when user is more familiar with underlying API name for the option
* Being pep8 compliant is nice, but not a requirement. Specifically, the 80 column limit now hinders readability more that it improves it
* Avoid '`action`/`command`', they are imperative and not declarative, there are other ways to express the same thing
* Do not add `list` or `info` state options to an existing module - create a new `_facts` module.
* If you are asking 'how can I have a module execute other modules' ... you want to write a role
* Return values must be able to be serialized as json via the python stdlib
json library. basic python types (strings, int, dicts, lists, etc) are
serializable. A common pitfall is to try returning an object via
exit_json(). Instead, convert the fields you need from the object into the
fields of a dictionary and return the dictionary.
* When fetching URLs, please use either fetch_url or open_url from ansible.module_utils.urls
rather than urllib2; urllib2 does not natively verify TLS certificates and so is insecure for https.
Windows modules checklist
`````````````````````````
* Favour native powershell and .net ways of doing things over calls to COM libraries or calls to native executables which may or may not be present in all versions of windows
* modules are in powershell (.ps1 files) but the docs reside in same name python file (.py)
* look at ansible/lib/ansible/module_utils/powershell.ps1 for common code, avoid duplication
* Ansible uses strictmode version 2.0 so be sure to test with that enabled
* start with::
#!powershell
then::
<GPL header>
then::
# WANT_JSON
# POWERSHELL_COMMON
then, to parse all arguments into a variable modules generally use::
$params = Parse-Args $args
* Arguments:
* Try and use state present and state absent like other modules
* You need to check that all your mandatory args are present. You can do this using the builtin Get-AnsibleParam function.
* Required arguments::
$package = Get-AnsibleParam -obj $params -name name -failifempty $true
* Required arguments with name validation::
$state = Get-AnsibleParam -obj $params -name "State" -ValidateSet "Present","Absent" -resultobj $resultobj -failifempty $true
* Optional arguments with name validation::
$state = Get-AnsibleParam -obj $params -name "State" -default "Present" -ValidateSet "Present","Absent"
* the If "FailIfEmpty" is true, the resultobj parameter is used to specify the object returned to fail-json. You can also override the default message
using $emptyattributefailmessage (for missing required attributes) and $ValidateSetErrorMessage (for attribute validation errors)
* Look at existing modules for more examples of argument checking.
* Results
* The result object should always contain an attribute called changed set to either $true or $false
* Create your result object like this::
$result = New-Object psobject @{
changed = $false
other_result_attribute = $some_value
};
If all is well, exit with a
Exit-Json $result
* Ensure anything you return, including errors can be converted to json.
* Be aware that because exception messages could contain almost anything.
* ConvertTo-Json will fail if it encounters a trailing \ in a string.
* If all is not well use Fail-Json to exit.
* Have you tested for powershell 3.0 and 4.0 compliance?
Deprecating and making module aliases
``````````````````````````````````````
Starting in 1.8, you can deprecate modules by renaming them with a preceding _, i.e. old_cloud.py to
_old_cloud.py. This keeps the module available, but hides it from the primary docs and listing.
You can also rename modules and keep an alias to the old name by using a symlink that starts with _.
This example allows the stat module to be called with fileinfo, making the following examples equivalent::
EXAMPLES = '''
ln -s stat.py _fileinfo.py
ansible -m stat -a "path=/tmp" localhost
ansible -m fileinfo -a "path=/tmp" localhost
'''
.. seealso::
:doc:`modules`
Learn about available modules
:doc:`developing_plugins`
Learn about developing plugins
:doc:`developing_api`
Learn about the Python API for playbook and task execution
`GitHub Core modules directory <https://github.com/ansible/ansible-modules-core/tree/devel>`_
Browse source of core modules
`Github Extras modules directory <https://github.com/ansible/ansible-modules-extras/tree/devel>`_
Browse source of extras modules.
`Mailing List <http://groups.google.com/group/ansible-devel>`_
Development mailing list
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel
.. include:: ./developing_module_utilities.rst

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===============================
Ansible and Porting to Python 3
===============================
Ansible can be divided into three overlapping pieces for the purposes of
porting:
1. Controller-side code. This is the code which runs on the machine where you
invoke /usr/bin/ansible
2. Modules. This is the code which Ansible transmits over the wire and
invokes on the managed machine.
3. module_utils code. This is code whose primary purpose is to be used by the
modules to perform tasks. However, some controller-side code might use
generic functions from here.
Much of the knowledge of porting code will be usable on all three of these
pieces but there are some special considerations for some of it as well.
--------------------------------------------
Minimum Version of Python-3.x and Python-2.x
--------------------------------------------
In controller side code, we support Python-3.5 or greater and Python-2.6 or
greater.
For modules (and by extension, module_utils) we support
Python-3.5 and Python-2.4. Python-3.5 was chosen as a minimum because it is the earliest Python-3 version
adopted as the default Python by a Long Term Support (LTS) Linux distribution (in this case, Ubuntu-16.04).
Previous LTS Linux distributions shipped with a Python-2 version which users can rely upon instead of the
Python-3 version.
For Python-2, the default is for modules to run on Python-2.4. This allows
users with older distributions that are stuck on Python-2.4 to manage their
machines. Modules are allowed to drop support for Python-2.4 when one of
their dependent libraries requires a higher version of Python. This is not an
invitation to add unnecessary dependent libraries in order to force your
module to be usable only with a newer version of Python.; instead it is an
acknowledgment that some libraries (for instance, boto3 and docker-py) will
only function with a newer version of Python.
.. note:: Python-2.4 Support:
The only long term supported distro that we know of with Python-2.4 support is
RHEL5 (and its rebuilds like CentOS5), which is supported until April of
2017. For Ansible, that means Ansible-2.3 will be the last major release
that supports Python-2.4 for modules. Ansible-2.4 will require
Python-2.6 or greater for modules.
-----------------------------------
Porting Controller Code to Python 3
-----------------------------------
Most of the general tips for porting code to be used on both Python-2 and
Python-3 applies to porting controller code. The best place to start learning
to port code is `Lennart Regebro's book: Porting to Python 3 <http://python3porting.com/>`_.
The book describes several strategies for porting to Python 3. The one we're
using is `to support Python-2 and Python-3 from a single code base
<http://python3porting.com/strategies.html#python-2-and-python-3-without-conversion>`_
Controller String Strategy
==========================
Background
----------
One of the most essential things to decide upon for porting code to Python-3
is what string model to use. Strings can be an array of bytes (like in C) or
they can be an array of text. Text is what we think of as letters, digits,
numbers, other printable symbols, and a small number of unprintable "symbols"
(control codes).
In Python-2, the two types for these (:class:`str` for bytes and
:class:`unicode` for text) are often used interchangeably. When dealing only
with ASCII characters, the strings can be combined, compared, and converted
from one type to another automatically. When non-ASCII characters are
introduced, Python starts throwing exceptions due to not knowing what encoding
the non-ASCII characters should be in.
Python-3 changes this behavior by making the separation between bytes (:class:`bytes`)
and text (:class:`str`) more strict. Python will throw an exception when
trying to combine and compare the two types. The programmer has to explicitly
convert from one type to the other to mix values from each.
This change makes it immediately apparent to the programmer when code is
mixing the types inappropriately, rather than working until one of their users
causes an exception by entering non-ASCII input. However, it forces the
programmer to proactively define a strategy for working with strings in their
program so that they don't mix text and byte strings unintentionally.
Unicode Sandwich
----------------
In controller-side code we use a strategy known as the Unicode Sandwich (named
after Python-2's :class:`unicode` text type). For Unicode Sandwich we know that
at the border of our code and the outside world (for example, file and network IO,
environment variables, and some library calls) we are going to receive bytes.
We need to transform these bytes into text and use that throughout the
internal portions of our code. When we have to send those strings back out to
the outside world we first convert the text back into bytes.
To visualize this, imagine a 'sandwich' consisting of a top and bottom layer
of bytes, a layer of conversion between, and all text type in the center.
Common Borders
--------------
This is a partial list of places where we have to convert to and from bytes.
It's not exhaustive but gives you an idea of where to watch for problems.
Reading and writing to files
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In Python-2, reading from files yields bytes. In Python-3, it can yield text.
To make code that's portable to both we don't make use of Python-3's ability
to yield text but instead do the conversion explicitly ourselves. For example::
from ansible.module_utils._text import to_text
with open('filename-with-utf8-data.txt', 'rb') as my_file:
b_data = my_file.read()
try:
data = to_text(b_data, errors='surrogate_or_strict')
except UnicodeError:
# Handle the exception gracefully -- usually by displaying a good
# user-centric error message that can be traced back to this piece
# of code.
.. note:: Much of Ansible assumes that all encoded text is UTF-8. At some
point, if there is demand for other encodings we may change that, but for
now it is safe to assume that bytes are UTF-8.
Writing to files is the opposite process::
from ansible.module_utils._text import to_bytes
with open('filename.txt', 'wb') as my_file:
my_file.write(to_bytes(some_text_string))
Note that we don't have to catch :exc:`UnicodeError` here because we're
transforming to UTF-8 and all text strings in Python can be transformed back
to UTF-8.
Filesystem Interaction
~~~~~~~~~~~~~~~~~~~~~~
Dealing with filenames often involves dropping back to bytes because on UNIX-like
systems filenames are bytes. On Python-2, if we pass a text string to these
functions, the text string will be converted to a byte string inside of the
function and a traceback will occur if non-ASCII characters are present. In
Python-3, a traceback will only occur if the text string can't be decoded in
the current locale, but it's still good to be explicit and have code which
works on both versions::
import os.path
from ansible.module_utils._text import to_bytes
filename = u'/var/tmp/くらとみ.txt'
f = open(to_bytes(filename), 'wb')
mtime = os.path.getmtime(to_bytes(filename))
b_filename = os.path.expandvars(to_bytes(filename))
if os.path.exists(to_bytes(filename)):
pass
When you are only manipulating a filename as a string without talking to the
filesystem (or a C library which talks to the filesystem) you can often get
away without converting to bytes::
import os.path
os.path.join(u'/var/tmp/café', u'くらとみ')
os.path.split(u'/var/tmp/café/くらとみ')
On the other hand, if the code needs to manipulate the filename and also talk
to the filesystem, it can be more convenient to transform to bytes right away
and manipulate in bytes.
.. warning:: Make sure all variables passed to a function are the same type.
If you're working with something like :func:`os.path.join` which takes
multiple strings and uses them in combination, you need to make sure that
all the types are the same (either all bytes or all text). Mixing
bytes and text will cause tracebacks.
Interacting with Other Programs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Interacting with other programs goes through the operating system and
C libraries and operates on things that the UNIX kernel defines. These
interfaces are all byte-oriented so the Python interface is byte oriented as
well. On both Python-2 and Python-3, byte strings should be given to Python's
subprocess library and byte strings should be expected back from it.
One of the main places in Ansible's controller code that we interact with
other programs is the connection plugins' ``exec_command`` methods. These
methods transform any text strings they receive in the command (and arugments
to the command) to execute into bytes and return stdout and stderr as byte strings
Higher level functions (like action plugins' ``_low_level_execute_command``)
transform the output into text strings.
Tips, tricks, and idioms to adopt
=================================
Forwards Compatibility Boilerplate
----------------------------------
Use the following boilerplate code at the top of all controller-side modules
to make certain constructs act the same way on Python-2 and Python-3::
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
``__metaclass__ = type`` makes all classes defined in the file into new-style
classes without explicitly inheriting from :class:`object`.
The ``__future__`` imports do the following:
:absolute_import: Makes imports look in :attr:`sys.path` for the modules being
imported, skipping the directory in which the module doing the importing
lives. If the code wants to use the directory in which the module doing
the importing, there's a new dot notation to do so.
:division: Makes division of integers always return a float. If you need to
find the quotient use ``x // y`` instead of ``x / y``.
:print_function: Changes :func:`print` from a keyword into a function.
.. seealso::
* `PEP 0328: Absolute Imports <https://www.python.org/dev/peps/pep-0328/#guido-s-decision>`_
* `PEP 0238: Division <https://www.python.org/dev/peps/pep-0238>`_
* `PEP 3105: Print function <https://www.python.org/dev/peps/pep-3105>`_
Prefix byte strings with "b\_"
------------------------------
Since mixing text and bytes types leads to tracebacks we want to be clear
about what variables hold text and what variables hold bytes. We do this by
prefixing any variable holding bytes with ``b_``. For instance::
filename = u'/var/tmp/café.txt'
b_filename = to_bytes(filename)
with open(b_filename) as f:
data = f.read()
We do not prefix the text strings instead because we only operate
on byte strings at the borders, so there are fewer variables that need bytes
than text.
---------------------------
Porting Modules to Python 3
---------------------------
Ansible modules are not the usual Python-3 porting exercise. There are two
factors that make it harder to port them than most code:
1. Many modules need to run on Python-2.4 in addition to Python-3.
2. A lot of mocking has to go into unit testing a Python-3 module, so it's
harder to test that your porting has fixed everything or to to make sure that
later commits haven't regressed.
Module String Strategy
======================
There are a large number of modules in Ansible. Most of those are maintained
by the Ansible community at large, not by a centralized team. To make life
easier on them, it was decided not to break backwards compatibility by
mandating that all strings inside of modules are text and converting between
text and bytes at the borders; instead, we're using a native string strategy
for now.
Tips, tricks, and idioms to adopt
=================================
Exceptions
----------
In code which already needs Python-2.6+ (for instance, because a library it
depends on only runs on Python >= 2.6) it is okay to port directly to the new
exception-catching syntax::
try:
a = 2/0
except ValueError as e:
module.fail_json(msg="Tried to divide by zero!")
For modules which also run on Python-2.4, we have to use an uglier
construction to make this work under both Python-2.4 and Python-3::
from ansible.module_utils.pycompat24 import get_exception
[...]
try:
a = 2/0
except ValueError:
e = get_exception()
module.fail_json(msg="Tried to divide by zero!")
Octal numbers
-------------
In Python-2.4, octal literals are specified as ``0755``. In Python-3, that is
invalid and octals must be specified as ``0o755``. To bridge this gap,
modules should create their octals like this::
# Can't use 0755 on Python-3 and can't use 0o755 on Python-2.4
EXECUTABLE_PERMS = int('0755', 8)
Bundled six
-----------
The third-party python-six library exists to help projects create code that
runs on both Python-2 and Python-3. Ansible includes version 1.4.1 in
module_utils so that other modules can use it without requiring that it is
installed on the remote system. To make use of it, import it like this::
from ansible.module_utils import six
.. note:: Why version 1.4.1?
six-1.4.1 is the last version of python-six to support Python-2.4. As
long as Ansible modules need to run on Python-2.4 we won't be able to
update the bundled copy of six.
Compile Test
------------
We have travis compiling all modules with various versions of Python to check
that the modules conform to the syntax at those versions. When you've
ported a module so that its syntax works with Python-3, we need to modify
.travis.yml so that the module is included in the syntax check. Here's the
relevant section of .travis.yml::
env:
global:
- PY3_EXCLUDE_LIST="cloud/amazon/cloudformation.py
cloud/amazon/ec2_ami.py
[...]
utilities/logic/wait_for.py"
The :envvar:`PY3_EXCLUDE_LIST` environment variable is a blacklist of modules
which should not be tested (because we know that they are older modules which
have not yet been ported to pass the Python-3 syntax checks. To get another
old module to compile with Python-3, remove the entry for it from the list.
The goal is to have the LIST be empty.
-------------------------------------
Porting module_utils code to Python 3
-------------------------------------
module_utils code is largely like module code. However, some pieces of it are
used by the controller as well. Because of this, it needs to be usable with
the controller's assumptions. This is most notable in the string strategy.
Module_utils String Strategy
============================
Module_utils **must** use the Native String Strategy. Functions in
module_utils receive either text strings or byte strings and may emit either
the same type as they were given or the native string for the Python version
they are run on depending on which makes the most sense for that function.
Functions which return strings **must** document whether they return text,
byte, or native strings. Module-utils functions are therefore often very
defensive in nature, converting from potential text or bytes at the
beginning of a function and converting to the native string type at the end.

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Developing Plugins
==================
.. contents:: Topics
Plugins are pieces of code that augment Ansible's core functionality. Ansible ships with a number of handy plugins, and you can easily write your own.
The following types of plugins are available:
- *Action* plugins are front ends to modules and can execute actions on the controller before calling the modules themselves.
- *Cache* plugins are used to keep a cache of 'facts' to avoid costly fact-gathering operations.
- *Callback* plugins enable you to hook into Ansible events for display or logging purposes.
- *Connection* plugins define how to communicate with inventory hosts.
- *Filters* plugins allow you to manipulate data inside Ansible plays and/or templates. This is a Jinja2 feature; Ansible ships extra filter plugins.
- *Lookup* plugins are used to pull data from an external source. These are implemented using a custom Jinja2 function.
- *Strategy* plugins control the flow of a play and execution logic.
- *Shell* plugins deal with low-level commands and formatting for the different shells Ansible can encounter on remote hosts.
- *Test* plugins allow you to validate data inside Ansible plays and/or templates. This is a Jinja2 feature; Ansible ships extra test plugins.
- *Vars* plugins inject additional variable data into Ansible runs that did not come from an inventory, playbook, or the command line.
This section describes the various types of plugins and how to implement them.
.. _developing_callbacks:
Callback Plugins
----------------
Callback plugins enable adding new behaviors to Ansible when responding to events. By default, callback plugins control most of the output you see when running the command line programs.
.. _callback_examples:
Example Callback Plugins
++++++++++++++++++++++++
Ansible comes with a number of callback plugins that you can look at for examples. These can be found in `lib/ansible/plugins/callback <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/callback>`_.
The `log_plays
<https://github.com/ansible/ansible/blob/devel/lib/ansible/plugins/callback/log_plays.py>`_
callback is an example of how to intercept playbook events to a log
file, and the `mail
<https://github.com/ansible/ansible/blob/devel/lib/ansible/plugins/callback/mail.py>`_
callback sends email when playbooks complete.
The `osx_say
<https://github.com/ansible/ansible/blob/devel/lib/ansible/plugins/callback/osx_say.py>`_
callback provided is particularly entertaining -- it will respond with
computer synthesized speech on OS X in relation to playbook events,
and is guaranteed to entertain and/or annoy coworkers.
.. _configuring_callbacks:
Configuring Callback Plugins
++++++++++++++++++++++++++++
You can activate a custom callback by either dropping it into a callback_plugins directory adjacent to your play or inside a role or by putting it in one of the callback directory sources configured in `ansible.cfg`.
Plugins are loaded in alphanumeric order; for example, a plugin implemented in a file named `1_first.py` would run before a plugin file named `2_second.py`.
Most callbacks shipped with Ansible are disabled by default and need to be whitelisted in your `ansible.cfg` file in order to function. For example::
#callback_whitelist = timer, mail, mycallbackplugin
Managing stdout
```````````````
You can only have one plugin be the main manager of your console output. If you want to replace the default, you should define CALLBACK_TYPE = stdout in the subclass and then configure the stdout plugin in `ansible.cfg`. For example::
#stdout_callback = mycallbackplugin
.. _callback_development:
Developing Callback Plugins
+++++++++++++++++++++++++++
Callback plugins are created by creating a new class with the Base(Callbacks) class as the parent::
from ansible.plugins.callback import CallbackBase
from ansible import constants as C
class CallbackModule(CallbackBase):
From there, override the specific methods from the CallbackBase that you want to provide a callback for. For plugins intended for use with Ansible version 2.0 and later, you should only override methods that start with `v2`. For a complete list of methods that you can override, please see ``__init__.py`` in the `lib/ansible/plugins/callback <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/callback>`_ directory.
The following example shows how Ansible's timer plugin is implemented::
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
from datetime import datetime
from ansible.plugins.callback import CallbackBase
class CallbackModule(CallbackBase):
"""
This callback module tells you how long your plays ran for.
"""
CALLBACK_VERSION = 2.0
CALLBACK_TYPE = 'aggregate'
CALLBACK_NAME = 'timer'
CALLBACK_NEEDS_WHITELIST = True
def __init__(self):
super(CallbackModule, self).__init__()
self.start_time = datetime.now()
def days_hours_minutes_seconds(self, runtime):
minutes = (runtime.seconds // 60) % 60
r_seconds = runtime.seconds - (minutes * 60)
return runtime.days, runtime.seconds // 3600, minutes, r_seconds
def playbook_on_stats(self, stats):
self.v2_playbook_on_stats(stats)
def v2_playbook_on_stats(self, stats):
end_time = datetime.now()
runtime = end_time - self.start_time
self._display.display("Playbook run took %s days, %s hours, %s minutes, %s seconds" % (self.days_hours_minutes_seconds(runtime)))
Note that the CALLBACK_VERSION and CALLBACK_NAME definitions are required for properly functioning plugins for Ansible >=2.0.
.. _developing_connection_plugins:
Connection Plugins
------------------
By default, ansible ships with a 'paramiko' SSH, native ssh (just called 'ssh'), 'local' connection type, and there are also some minor players like 'chroot' and 'jail'. All of these can be used in playbooks and with /usr/bin/ansible to decide how you want to talk to remote machines. The basics of these connection types
are covered in the :doc:`intro_getting_started` section. Should you want to extend Ansible to support other transports (SNMP? Message bus?
Carrier Pigeon?) it's as simple as copying the format of one of the existing modules and dropping it into the connection plugins
directory. The value of 'smart' for a connection allows selection of paramiko or openssh based on system capabilities, and chooses
'ssh' if OpenSSH supports ControlPersist, in Ansible 1.2.1 and later. Previous versions did not support 'smart'.
More documentation on writing connection plugins is pending, though you can jump into `lib/ansible/plugins/connection <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/connection>`_ and figure things out pretty easily.
.. _developing_lookup_plugins:
Lookup Plugins
--------------
Lookup plugins are used to pull in data from external data stores. Lookup plugins can be used within playbooks for both looping - playbook language constructs like "with_fileglob" and "with_items" are implemented via lookup plugins - and to return values into a variable or parameter.
Here's a simple lookup plugin implementation - this lookup returns the contents of a text file as a variable::
from ansible.errors import AnsibleError, AnsibleParserError
from ansible.plugins.lookup import LookupBase
try:
from __main__ import display
except ImportError:
from ansible.utils.display import Display
display = Display()
class LookupModule(LookupBase):
def run(self, terms, variables=None, **kwargs):
ret = []
for term in terms:
display.debug("File lookup term: %s" % term)
# Find the file in the expected search path
lookupfile = self.find_file_in_search_path(variables, 'files', term)
display.vvvv(u"File lookup using %s as file" % lookupfile)
try:
if lookupfile:
contents, show_data = self._loader._get_file_contents(lookupfile)
ret.append(contents.rstrip())
else:
raise AnsibleParserError()
except AnsibleParserError:
raise AnsibleError("could not locate file in lookup: %s" % term)
return ret
An example of how this lookup is called::
---
- hosts: all
vars:
contents: "{{ lookup('file', '/etc/foo.txt') }}"
tasks:
- debug: msg="the value of foo.txt is {{ contents }} as seen today {{ lookup('pipe', 'date +"%Y-%m-%d"') }}"
Errors encountered during execution should be returned by raising AnsibleError() with a message describing the error. Any strings returned by your lookup plugin implementation that could ever contain non-ASCII characters must be converted into Python's unicode type because the strings will be run through jinja2. To do this, you can use::
from ansible.module_utils._text import to_text
result_string = to_text(result_string)
For more example lookup plugins, check out the source code for the lookup plugins that are included with Ansible here: `lib/ansible/plugins/lookup <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/lookup>`_.
For usage examples of lookup plugins, see `Using Lookups <http://docs.ansible.com/ansible/playbooks_lookups.html>`_.
.. _developing_vars_plugins:
Vars Plugins
------------
Playbook constructs like 'host_vars' and 'group_vars' work via 'vars' plugins. They inject additional variable
data into ansible runs that did not come from an inventory, playbook, or command line. Note that variables
can also be returned from inventory, so in most cases, you won't need to write or understand vars_plugins.
More documentation on writing vars plugins is pending, though you can jump into `lib/ansible/inventory/vars_plugins <https://github.com/ansible/ansible/tree/devel/lib/ansible/inventory/vars_plugins>`_ and figure
things out pretty easily.
If you find yourself wanting to write a vars_plugin, it's more likely you should write an inventory script instead.
.. _developing_filter_plugins:
Filter Plugins
--------------
Filter plugins are used for manipulating data. They are a feature of Jinja2 and are also available in Jinja2 templates used by the `template` module. As with all plugins, they can be easily extended, but instead of having a file for each one you can have several per file. Most of the filter plugins shipped with Ansible reside in a `core.py`.
See `lib/ansible/plugins/filter <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/filter>`_ for details.
.. _developing_test_plugins:
Test Plugins
------------
Test plugins are for verifying data. They are a feature of Jinja2 and are also available in Jinja2 templates used by the `template` module. As with all plugins, they can be easily extended, but instead of having a file for each one you can have several per file. Most of the test plugins shipped with Ansible reside in a `core.py`. These are specially useful in conjunction with some filter plugins like `map` and `select`; they are also available for conditional directives like `when:`.
See `lib/ansible/plugins/filter <https://github.com/ansible/ansible/tree/devel/lib/ansible/plugins/filter>`_ for details.
.. _distributing_plugins:
Distributing Plugins
--------------------
Plugins are loaded from the library installed path and the configured plugins directory (check your `ansible.cfg`).
The location can vary depending on how you installed Ansible (pip, rpm, deb, etc) or by the OS/Distribution/Packager.
Plugins are automatically loaded when you have one of the following subfolders adjacent to your playbook or inside a role::
* action_plugins
* lookup_plugins
* callback_plugins
* connection_plugins
* filter_plugins
* strategy_plugins
* cache_plugins
* test_plugins
* shell_plugins
When shipped as part of a role, the plugin will be available as soon as the role is called in the play.
.. seealso::
:doc:`modules`
List of built-in modules
:doc:`developing_api`
Learn about the Python API for task execution
:doc:`developing_inventory`
Learn about how to develop dynamic inventory sources
:doc:`developing_modules`
Learn about how to write Ansible modules
`Mailing List <http://groups.google.com/group/ansible-devel>`_
The development mailing list
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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.. _flow_modules:
=======
Modules
=======
This in-depth dive helps you understand Ansible's program flow to execute
modules. It is written for people working on the portions of the Core Ansible
Engine that execute a module. Those writing Ansible Modules may also find this
in-depth dive to be of interest, but individuals simply using Ansible Modules
will not likely find this to be helpful.
.. _flow_types_of_modules:
Types of Modules
================
Ansible supports several different types of modules in its code base. Some of
these are for backwards compatibility and others are to enable flexibility.
.. _flow_action_plugins:
Action Plugins
--------------
Action Plugins look like modules to end users who are writing :term:`playbooks` but
they're distinct entities for the purposes of this document. Action Plugins
always execute on the controller and are sometimes able to do all work there
(for instance, the ``debug`` Action Plugin which prints some text for the user to
see or the ``assert`` Action Plugin which can test whether several values in
a playbook satisfy certain criteria.)
More often, Action Plugins set up some values on the controller, then invoke an
actual module on the managed node that does something with these values. An
easy to understand version of this is the :ref:`template Action Plugin
<template>`. The :ref:`template Action Plugin <template>` takes values from
the user to construct a file in a temporary location on the controller using
variables from the playbook environment. It then transfers the temporary file
to a temporary file on the remote system. After that, it invokes the
:ref:`copy module <copy>` which operates on the remote system to move the file
into its final location, sets file permissions, and so on.
.. _flow_new_style_modules:
New-style Modules
-----------------
All of the modules that ship with Ansible fall into this category.
New-style modules have the arguments to the module embedded inside of them in
some manner. Non-new-style modules must copy a separate file over to the
managed node, which is less efficient as it requires two over-the-wire
connections instead of only one.
.. _flow_python_modules:
Python
^^^^^^
New-style Python modules use the :ref:`Ansiballz` framework for constructing
modules. All official modules (shipped with Ansible) use either this or the
:ref:`powershell module framework <flow_powershell_modules>`.
These modules use imports from :code:`ansible.module_utils` in order to pull in
boilerplate module code, such as argument parsing, formatting of return
values as :term:`JSON`, and various file operations.
.. note:: In Ansible, up to version 2.0.x, the official Python modules used the
:ref:`module_replacer` framework. For module authors, :ref:`Ansiballz` is
largely a superset of :ref:`module_replacer` functionality, so you usually
do not need to know about one versus the other.
.. _flow_powershell_modules:
Powershell
^^^^^^^^^^
New-style powershell modules use the :ref:`module_replacer` framework for
constructing modules. These modules get a library of powershell code embedded
in them before being sent to the managed node.
.. _flow_jsonargs_modules:
JSONARGS
^^^^^^^^
Scripts can arrange for an argument string to be placed within them by placing
the string ``<<INCLUDE_ANSIBLE_MODULE_JSON_ARGS>>`` somewhere inside of the
file. The module typically sets a variable to that value like this::
json_arguments = """<<INCLUDE_ANSIBLE_MODULE_JSON_ARGS>>"""
Which is expanded as::
json_arguments = """{"param1": "test's quotes", "param2": "\"To be or not to be\" - Hamlet"}"""
.. note:: Ansible outputs a :term:`JSON` string with bare quotes. Double quotes are
used to quote string values, double quotes inside of string values are
backslash escaped, and single quotes may appear unescaped inside of
a string value. To use JSONARGS, your scripting language must have a way
to handle this type of string. The example uses Python's triple quoted
strings to do this. Other scripting languages may have a similar quote
character that won't be confused by any quotes in the JSON or it may
allow you to define your own start-of-quote and end-of-quote characters.
If the language doesn't give you any of these then you'll need to write
a :ref:`non-native JSON module <flow_want_json_modules>` or
:ref:`Old-style module <flow_old_style_modules>` instead.
The module typically parses the contents of ``json_arguments`` using a JSON
library and then use them as native variables throughout the rest of its code.
.. _flow_want_json_modules:
Non-native want JSON modules
----------------------------
If a module has the string ``WANT_JSON`` in it anywhere, Ansible treats
it as a non-native module that accepts a filename as its only command line
parameter. The filename is for a temporary file containing a :term:`JSON`
string containing the module's parameters. The module needs to open the file,
read and parse the parameters, operate on the data, and print its return data
as a JSON encoded dictionary to stdout before exiting.
These types of modules are self-contained entities. As of Ansible 2.1, Ansible
only modifies them to change a shebang line if present.
.. seealso:: Examples of Non-native modules written in ruby are in the `Ansible
for Rubyists <https://github.com/ansible/ansible-for-rubyists>`_ repository.
.. _flow_binary_modules:
Binary Modules
--------------
From Ansible 2.2 onwards, modules may also be small binary programs. Ansible
doesn't perform any magic to make these portable to different systems so they
may be specific to the system on which they were compiled or require other
binary runtime dependencies. Despite these drawbacks, a site may sometimes
have no choice but to compile a custom module against a specific binary
library if that's the only way they have to get access to certain resources.
Binary modules take their arguments and will return data to Ansible in the same
way as :ref:`want JSON modules <flow_want_json_modules>`.
.. seealso:: One example of a `binary module
<https://github.com/ansible/ansible/blob/devel/test/integration/targets/binary_modules/library/helloworld.go>`_
written in go.
.. _flow_old_style_modules:
Old-style Modules
-----------------
Old-style modules are similar to
:ref:`want JSON modules <flow_want_json_modules>`, except that the file that
they take contains ``key=value`` pairs for their parameters instead of
:term:`JSON`.
Ansible decides that a module is old-style when it doesn't have any of the
markers that would show that it is one of the other types.
.. _flow_how_modules_are_executed:
How modules are executed
========================
When a user uses :program:`ansible` or :program:`ansible-playbook`, they
specify a task to execute. The task is usually the name of a module along
with several parameters to be passed to the module. Ansible takes these
values and processes them in various ways before they are finally executed on
the remote machine.
.. _flow_executor_task_executor:
executor/task_executor
----------------------
The TaskExecutor receives the module name and parameters that were parsed from
the :term:`playbook <playbooks>` (or from the command line in the case of
:command:`/usr/bin/ansible`). It uses the name to decide whether it's looking
at a module or an :ref:`Action Plugin <flow_action_plugins>`. If it's
a module, it loads the :ref:`Normal Action Plugin <flow_normal_action_plugin>`
and passes the name, variables, and other information about the task and play
to that Action Plugin for further processing.
.. _flow_normal_action_plugin:
Normal Action Plugin
--------------------
The ``normal`` Action Plugin executes the module on the remote host. It is
the primary coordinator of much of the work to actually execute the module on
the managed machine.
* It takes care of creating a connection to the managed machine by
instantiating a ``Connection`` class according to the inventory
configuration for that host.
* It adds any internal Ansible variables to the module's parameters (for
instance, the ones that pass along ``no_log`` to the module).
* It takes care of creating any temporary files on the remote machine and
cleans up afterwards.
* It does the actual work of pushing the module and module parameters to the
remote host, although the :ref:`module_common <flow_executor_module_common>`
code described in the next section does the work of deciding which format
those will take.
* It handles any special cases regarding modules (for instance, various
complications around Windows modules that must have the same names as Python
modules, so that internal calling of modules from other Action Plugins work.)
Much of this functionality comes from the :class:`BaseAction` class,
which lives in :file:`plugins/action/__init__.py`. It makes use of
``Connection`` and ``Shell`` objects to do its work.
.. note::
When :term:`tasks <tasks>` are run with the ``async:`` parameter, Ansible
uses the ``async`` Action Plugin instead of the ``normal`` Action Plugin
to invoke it. That program flow is currently not documented. Read the
source for information on how that works.
.. _flow_executor_module_common:
executor/module_common.py
-------------------------
Code in :file:`executor/module_common.py` takes care of assembling the module
to be shipped to the managed node. The module is first read in, then examined
to determine its type. :ref:`PowerShell <flow_powershell_modules>` and
:ref:`JSON-args modules <flow_jsonargs_modules>` are passed through
:ref:`Module Replacer <module_replacer>`. New-style
:ref:`Python modules <flow_python_modules>` are assembled by :ref:`Ansiballz`.
:ref:`Non-native-want-JSON <flow_want_json_modules>`,
:ref:`Binary modules <flow_binary_modules>`, and
:ref:`Old-Style modules <flow_old_style_modules>` aren't touched by either of
these and pass through unchanged. After the assembling step, one final
modification is made to all modules that have a shebang line. Ansible checks
whether the interpreter in the shebang line has a specific path configured via
an ``ansible_$X_interpreter`` inventory variable. If it does, Ansible
substitutes that path for the interpreter path given in the module. After
this, Ansible returns the complete module data and the module type to the
:ref:`Normal Action <flow_normal_action_plugin>` which continues execution of
the module.
Next we'll go into some details of the two assembler frameworks.
.. _module_replacer:
Module Replacer
^^^^^^^^^^^^^^^
The Module Replacer framework is the original framework implementing new-style
modules. It is essentially a preprocessor (like the C Preprocessor for those
familiar with that programming language). It does straight substitutions of
specific substring patterns in the module file. There are two types of
substitutions:
* Replacements that only happen in the module file. These are public
replacement strings that modules can utilize to get helpful boilerplate or
access to arguments.
- :code:`from ansible.module_utils.MOD_LIB_NAME import *` is replaced with the
contents of the :file:`ansible/module_utils/MOD_LIB_NAME.py` These should
only be used with :ref:`new-style Python modules <flow_python_modules>`.
- :code:`#<<INCLUDE_ANSIBLE_MODULE_COMMON>>` is equivalent to
:code:`from ansible.module_utils.basic import *` and should also only apply
to new-style Python modules.
- :code:`# POWERSHELL_COMMON` substitutes the contents of
:file:`ansible/module_utils/powershell.ps1`. It should only be used with
:ref:`new-style Powershell modules <flow_powershell_modules>`.
* Replacements that are used by ``ansible.module_utils`` code. These are internal
replacement patterns. They may be used internally, in the above public
replacements, but shouldn't be used directly by modules.
- :code:`"<<ANSIBLE_VERSION>>"` is substituted with the Ansible version. In
:ref:`new-style Python modules <flow_python_modules>` under the
:ref:`Ansiballz` frameworkthe proper way is to instead instantiate an
:class:`AnsibleModule` and then access the version from
:attr:``AnsibleModule.ansible_version``.
- :code:`"<<INCLUDE_ANSIBLE_MODULE_COMPLEX_ARGS>>"` is substituted with
a string which is the Python ``repr`` of the :term:`JSON` encoded module
parameters. Using ``repr`` on the JSON string makes it safe to embed in
a Python file. In new-style Python modules under the Ansiballz framework
this is better accessed by instantiating an :class:`AnsibleModule` and
then using :attr:`AnsibleModule.params`.
- :code:`<<SELINUX_SPECIAL_FILESYSTEMS>>` substitutes a string which is
a comma separated list of file systems which have a file system dependent
security context in SELinux. In new-style Python modules, if you really
need this you should instantiate an :class:`AnsibleModule` and then use
:attr:`AnsibleModule._selinux_special_fs`. The variable has also changed
from a comma separated string of file system names to an actual python
list of filesystem names.
- :code:`<<INCLUDE_ANSIBLE_MODULE_JSON_ARGS>>` substitutes the module
parameters as a JSON string. Care must be taken to properly quote the
string as JSON data may contain quotes. This pattern is not substituted
in new-style Python modules as they can get the module parameters another
way.
- The string :code:`syslog.LOG_USER` is replaced wherever it occurs with the
``syslog_facility`` which was named in :file:`ansible.cfg` or any
``ansible_syslog_facility`` inventory variable that applies to this host. In
new-style Python modules this has changed slightly. If you really need to
access it, you should instantiate an :class:`AnsibleModule` and then use
:attr:`AnsibleModule._syslog_facility` to access it. It is no longer the
actual syslog facility and is now the name of the syslog facility. See
the :ref:`documentation on internal arguments <flow_internal_arguments>`
for details.
.. _Ansiballz:
Ansiballz
^^^^^^^^^
Ansible 2.1 switched from the :ref:`module_replacer` framework to the
Ansiballz framework for assembling modules. The Ansiballz framework differs
from module replacer in that it uses real Python imports of things in
:file:`ansible/module_utils` instead of merely preprocessing the module. It
does this by constructing a zipfile -- which includes the module file, files
in :file:`ansible/module_utils` that are imported by the module, and some
boilerplate to pass in the module's parameters. The zipfile is then Base64
encoded and wrapped in a small Python script which decodes the Base64 encoding
and places the zipfile into a temp directory on the managed node. It then
extracts just the ansible module script from the zip file and places that in
the temporary directory as well. Then it sets the PYTHONPATH to find python
modules inside of the zip file and invokes :command:`python` on the extracted
ansible module.
.. note::
Ansible wraps the zipfile in the Python script for two reasons:
* for compatibility with Python-2.4 and Python-2.6 which have less
featureful versions of Python's ``-m`` command line switch.
* so that pipelining will function properly. Pipelining needs to pipe the
Python module into the Python interpreter on the remote node. Python
understands scripts on stdin but does not understand zip files.
In Ansiballz, any imports of Python modules from the
:py:mod:`ansible.module_utils` package trigger inclusion of that Python file
into the zipfile. Instances of :code:`#<<INCLUDE_ANSIBLE_MODULE_COMMON>>` in
the module are turned into :code:`from ansible.module_utils.basic import *`
and :file:`ansible/module-utils/basic.py` is then included in the zipfile.
Files that are included from :file:`module_utils` are themselves scanned for
imports of other Python modules from :file:`module_utils` to be included in
the zipfile as well.
.. warning::
At present, the Ansiballz Framework cannot determine whether an import
should be included if it is a relative import. Always use an absolute
import that has :py:mod:`ansible.module_utils` in it to allow Ansiballz to
determine that the file should be included.
.. _flow_passing_module_args:
Passing args
~~~~~~~~~~~~
In :ref:`module_replacer`, module arguments are turned into a JSON-ified
string and substituted into the combined module file. In :ref:`Ansiballz`,
the JSON-ified string is passed into the module via stdin. When
a :class:`ansible.module_utils.basic.AnsibleModule` is instantiated,
it parses this string and places the args into
:attr:`AnsibleModule.params` where it can be accessed by the module's
other code.
.. note::
Internally, the :class:`AnsibleModule` uses the helper function,
:py:func:`ansible.module_utils.basic._load_params`, to load the parameters
from stdin and save them into an internal global variable. Very dynamic
custom modules which need to parse the parameters prior to instantiating
an ``AnsibleModule`` may use ``_load_params`` to retrieve the
parameters. Be aware that ``_load_params`` is an internal function and
may change in breaking ways if necessary to support changes in the code.
However, we'll do our best not to break it gratuitously, which is not
something that can be said for either the way parameters are passed or
the internal global variable.
.. _flow_internal_arguments:
Internal arguments
^^^^^^^^^^^^^^^^^^
Both :ref:`module_replacer` and :ref:`Ansiballz` send additional arguments to
the module beyond those which the user specified in the playbook. These
additional arguments are internal parameters that help implement global
Ansible features. Modules often do not need to know about these explicitly as
the features are implemented in :py:mod:`ansible.module_utils.basic` but certain
features need support from the module so it's good to know about them.
_ansible_no_log
~~~~~~~~~~~~~~~
This is a boolean. If it's True then the playbook specified ``no_log`` (in
a task's parameters or as a play parameter). This automatically affects calls
to :py:meth:`AnsibleModule.log`. If a module implements its own logging then
it needs to check this value. The best way to look at this is for the module
to instantiate an :class:`AnsibleModule` and then check the value of
:attr:`AnsibleModule.no_log`.
.. note::
``no_log`` specified in a module's argument_spec are handled by a different mechanism.
_ansible_debug
~~~~~~~~~~~~~~
This is a boolean that turns on more verbose logging. If a module uses
:py:meth:`AnsibleModule.debug` rather than :py:meth:`AnsibleModule.log` then
the messages are only logged if this is True. This also turns on logging of
external commands that the module executes. This can be changed via
the ``debug`` setting in :file:`ansible.cfg` or the environment variable
:envvar:`ANSIBLE_DEBUG`. If, for some reason, a module must access this, it
should do so by instantiating an :class:`AnsibleModule` and accessing
:attr:`AnsibleModule._debug`.
_ansible_diff
~~~~~~~~~~~~~
This boolean is turned on via the ``--diff`` command line option. If a module
supports it, it will tell the module to show a unified diff of changes to be
made to templated files. The proper way for a module to access this is by
instantiating an :class:`AnsibleModule` and accessing
:attr:`AnsibleModule._diff`.
_ansible_verbosity
~~~~~~~~~~~~~~~~~~
This value could be used for finer grained control over logging. However, it
is currently unused.
_ansible_selinux_special_fs
~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is a list of names of filesystems which should have a special selinux
context. They are used by the :class:`AnsibleModule` methods which operate on
files (changing attributes, moving, and copying). The list of names is set
via a comma separated string of filesystem names from :file:`ansible.cfg`::
# ansible.cfg
[selinux]
special_context_filesystems=nfs,vboxsf,fuse,ramfs
If a module cannot use the builtin ``AnsibleModule`` methods to manipulate
files and needs to know about these special context filesystems, it should
instantiate an ``AnsibleModule`` and then examine the list in
:attr:`AnsibleModule._selinux_special_fs`.
This replaces :attr:`ansible.module_utils.basic.SELINUX_SPECIAL_FS` from
:ref:`module_replacer`. In module replacer it was a comma separated string of
filesystem names. Under Ansiballz it's an actual list.
.. versionadded:: 2.1
_ansible_syslog_facility
~~~~~~~~~~~~~~~~~~~~~~~~
This parameter controls which syslog facility ansible module logs to. It may
be set by changing the ``syslog_facility`` value in :file:`ansible.cfg`. Most
modules should just use :meth:`AnsibleModule.log` which will then make use of
this. If a module has to use this on its own, it should instantiate an
:class:`AnsibleModule` and then retrieve the name of the syslog facility from
:attr:`AnsibleModule._syslog_facility`. The code will look slightly different
than it did under :ref:`module_replacer` due to how hacky the old way was::
# Old way
import syslog
syslog.openlog(NAME, 0, syslog.LOG_USER)
# New way
import syslog
facility_name = module._syslog_facility
facility = getattr(syslog, facility_name, syslog.LOG_USER)
syslog.openlog(NAME, 0, facility)
.. versionadded:: 2.1
_ansible_version
~~~~~~~~~~~~~~~~
This parameter passes the version of ansible that runs the module. To access
it, a module should instantiate an :class:`AnsibleModule` and then retrieve it
from :attr:`AnsibleModule.ansible_version`. This replaces
:attr:`ansible.module_utils.basic.ANSIBLE_VERSION` from
:ref:`module_replacer`.
.. versionadded:: 2.1
.. _flow_special_considerations:
Special Considerations
----------------------
.. _flow_pipelining:
Pipelining
^^^^^^^^^^
Ansible can transfer a module to a remote machine in one of two ways:
* it can write out the module to a temporary file on the remote host and then
use a second connection to the remote host to execute it with the
interpreter that the module needs
* or it can use what's known as pipelining to execute the module by piping it
into the remote interpreter's stdin.
Pipelining only works with modules written in Python at this time because
Ansible only knows that Python supports this mode of operation. Supporting
pipelining means that whatever format the module payload takes before being
sent over the wire must be executable by Python via stdin.
.. _flow_args_over_stdin:
Why pass args over stdin?
^^^^^^^^^^^^^^^^^^^^^^^^^
Passing arguments via stdin was chosen for the following reasons:
* When combined with :ref:`pipelining`, this keeps the module's arguments from
temporarily being saved onto disk on the remote machine. This makes it
harder (but not impossible) for a malicious user on the remote machine to
steal any sensitive information that may be present in the arguments.
* Command line arguments would be insecure as most systems allow unprivileged
users to read the full commandline of a process.
* Environment variables are usually more secure than the commandline but some
systems limit the total size of the environment. This could lead to
truncation of the parameters if we hit that limit.

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Rebasing a Pull Request
```````````````````````
You may find that your pull request (PR) is out-of-date and needs to be rebased. This can happen for several reasons:
- Files modified in your PR are in conflict with changes which have already been merged.
- Your PR is old enough that significant changes to automated test infrastructure have occurred.
Rebasing the branch used to create your PR will resolve both of these issues.
Configuring Your Remotes
++++++++++++++++++++++++
Before you can rebase your PR, you need to make sure you have the proper remotes configured.
Assuming you cloned your fork in the usual fashion, the ``origin`` remote will point to your fork::
$ git remote -v
origin git@github.com:YOUR_GITHUB_USERNAME/ansible.git (fetch)
origin git@github.com:YOUR_GITHUB_USERNAME/ansible.git (push)
However, you also need to add a remote which points to the upstream repository::
$ git remote add upstream https://github.com/ansible/ansible.git
Which should leave you with the following remotes::
$ git remote -v
origin git@github.com:YOUR_GITHUB_USERNAME/ansible.git (fetch)
origin git@github.com:YOUR_GITHUB_USERNAME/ansible.git (push)
upstream https://github.com/ansible/ansible.git (fetch)
upstream https://github.com/ansible/ansible.git (push)
Checking the status of your branch should show you're up-to-date with your fork at the ``origin`` remote::
$ git status
On branch YOUR_BRANCH
Your branch is up-to-date with 'origin/YOUR_BRANCH'.
nothing to commit, working tree clean
Rebasing Your Branch
++++++++++++++++++++
Once you have an ``upstream`` remote configured, you can rebase the branch for your PR::
$ git pull --rebase upstream devel
This will replay the changes in your branch on top of the changes made in the upstream ``devel`` branch.
If there are merge conflicts, you will be prompted to resolve those before you can continue.
Once you've rebased, the status of your branch will have changed::
$ git status
On branch YOUR_BRANCH
Your branch and 'origin/YOUR_BRANCH' have diverged,
and have 4 and 1 different commits each, respectively.
(use "git pull" to merge the remote branch into yours)
nothing to commit, working tree clean
Don't worry, this is normal after a rebase. You should ignore the ``git status`` instructions to use ``git pull``.
We'll cover what to do next in the following section.
Updating Your Pull Request
++++++++++++++++++++++++++
Now that you've rebased your branch, you need to push your changes to GitHub to update your PR.
Since rebasing re-writes git history, you will need to use a force push::
$ git push --force
Your PR on GitHub has now been updated. This will automatically trigger testing of your changes.
You should check in on the status of your PR after tests have completed to see if further changes are required.
Getting Help Rebasing
+++++++++++++++++++++
For help with rebasing your PR, or other development related questions, join us on our #ansible-devel IRC chat channel
on `freenode.net <https://freenode.net>`_.

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Releases
========
.. contents:: Topics
:local:
.. _schedule:
Release Schedule
````````````````
Ansible is on a 'flexible' 4 month release schedule, sometimes this can be extended if there is a major change that requires a longer cycle (i.e. 2.0 core rewrite).
Currently modules get released at the same time as the main Ansible repo, even though they are separated into ansible-modules-core and ansible-modules-extras.
The major features and bugs fixed in a release should be reflected in the CHANGELOG.md, minor ones will be in the commit history (FIXME: add git example to list).
When a fix/feature gets added to the `devel` branch it will be part of the next release, some bugfixes can be backported to previous releases and might be part of a minor point release if it is deemed necessary.
Sometimes an RC can be extended by a few days if a bugfix makes a change that can have far reaching consequences, so users have enough time to find any new issues that may stem from this.
.. _methods:
Release methods
````````````````
Ansible normally goes through a 'release candidate', issuing an RC1 for a release, if no major bugs are discovered in it after 5 business days we'll get a final release.
Otherwise fixes will be applied and an RC2 will be provided for testing and if no bugs after 2 days, the final release will be made, iterating this last step and incrementing the candidate number as we find major bugs.
.. _freezing:
Release feature freeze
``````````````````````
During the release candidate process, the focus will be on bugfixes that affect the RC, new features will be delayed while we try to produce a final version. Some bugfixes that are minor or don't affect the RC will also be postponed until after the release is finalized.
.. seealso::
:doc:`developing_api`
Python API to Playbooks and Ad Hoc Task Execution
:doc:`developing_modules`
How to develop modules
:doc:`developing_plugins`
How to develop plugins
`Ansible Tower <http://ansible.com/ansible-tower>`_
REST API endpoint and GUI for Ansible, syncs with dynamic inventory
`Development Mailing List <http://groups.google.com/group/ansible-devel>`_
Mailing list for development topics
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Helping Testing PRs
```````````````````
If you're a developer, one of the most valuable things you can do is look at the github issues list and help fix bugs. We almost always prioritize bug fixing over
feature development, so clearing bugs out of the way is one of the best things you can do.
Even if you're not a developer, helping test pull requests for bug fixes and features is still immensely valuable.
This goes for testing new features as well as testing bugfixes.
In many cases, code should add tests that prove it works but that's not ALWAYS possible and tests are not always comprehensive, especially when a user doesn't have access
to a wide variety of platforms, or that is using an API or web service.
In these cases, live testing against real equipment can be more valuable than automation that runs against simulated interfaces.
In any case, things should always be tested manually the first time too.
Thankfully helping test ansible is pretty straightforward, assuming you are already used to how ansible works.
Get Started with A Source Checkout
++++++++++++++++++++++++++++++++++
You can do this by checking out ansible, making a test branch off the main one, merging a GitHub issue, testing,
and then commenting on that particular issue on GitHub. Here's how:
.. note::
Testing source code from GitHub pull requests sent to us does have some inherent risk, as the source code
sent may have mistakes or malicious code that could have a negative impact on your system. We recommend
doing all testing on a virtual machine, whether a cloud instance, or locally. Some users like Vagrant
or Docker for this, but they are optional. It is also useful to have virtual machines of different Linux or
other flavors, since some features (apt vs. yum, for example) are specific to those OS versions.
First, you will need to configure your testing environment with the necessary tools required to run our test
suites. You will need at least::
git
python-nosetests (sometimes named python-nose)
python-passlib
python-mock
If you want to run the full integration test suite you'll also need the following packages installed::
svn
hg
python-pip
gem
Second, if you haven't already, clone the Ansible source code from GitHub::
git clone https://github.com/ansible/ansible.git --recursive
cd ansible/
.. note::
If you have previously forked the repository on GitHub, you could also clone it from there.
.. note::
If updating your repo for testing something module related, use "git rebase origin/devel" and then "git submodule update" to fetch
the latest development versions of modules. Skipping the "git submodule update" step will result in versions that will be stale.
Activating The Source Checkout
++++++++++++++++++++++++++++++
The Ansible source includes a script that allows you to use Ansible directly from source without requiring a
full installation, that is frequently used by developers on Ansible.
Simply source it (to use the Linux/Unix terminology) to begin using it immediately::
source ./hacking/env-setup
This script modifies the PYTHONPATH enviromnent variables (along with a few other things), which will be temporarily
set as long as your shell session is open.
If you'd like your testing environment to always use the latest source, you could call the command from startup scripts (for example,
`.bash_profile`).
Finding A Pull Request and Checking It Out On A Branch
++++++++++++++++++++++++++++++++++++++++++++++++++++++
Next, find the pull request you'd like to test and make note of the line at the top which describes the source
and destination repositories. It will look something like this::
Someuser wants to merge 1 commit into ansible:devel from someuser:feature_branch_name
.. note::
It is important that the PR request target be ansible:devel, as we do not accept pull requests into any other branch. Dot releases are cherry-picked manually by ansible staff.
The username and branch at the end are the important parts, which will be turned into git commands as follows::
git checkout -b testing_PRXXXX devel
git pull https://github.com/someuser/ansible.git feature_branch_name
The first command creates and switches to a new branch named testing_PRXXXX, where the XXXX is the actual issue number associated with the pull request (for example, 1234). This branch is based on the devel branch. The second command pulls the new code from the users feature branch into the newly created branch.
.. note::
If the GitHub user interface shows that the pull request will not merge cleanly, we do not recommend proceeding if you are not somewhat familiar with git and coding, as you will have to resolve a merge conflict. This is the responsibility of the original pull request contributor.
.. note::
Some users do not create feature branches, which can cause problems when they have multiple, un-related commits in their version of `devel`. If the source looks like `someuser:devel`, make sure there is only one commit listed on the pull request.
Finding a Pull Request for Ansible Modules
++++++++++++++++++++++++++++++++++++++++++
Ansible modules are in separate repositories, which are managed as Git submodules. Here's a step by step process for checking out a PR for an Ansible extras module, for instance:
1. git clone https://github.com/ansible/ansible.git
2. cd ansible
3. git submodule init
4. git submodule update --recursive [ fetches the submodules ]
5. cd lib/ansible/modules/extras
6. git fetch origin pull/1234/head:pr/1234 [ fetches the specific PR ]
7. git checkout pr/1234 [ do your testing here ]
8. cd /path/to/ansible/clone
9. git submodule update --recursive
For Those About To Test, We Salute You
++++++++++++++++++++++++++++++++++++++
At this point, you should be ready to begin testing!
If the PR is a bug-fix pull request, the first things to do are to run the suite of unit and integration tests, to ensure
the pull request does not break current functionality::
# Unit Tests
make tests
# Integration Tests
cd test/integration
make
.. note::
Ansible does provide integration tests for cloud-based modules as well, however we do not recommend using them for some users
due to the associated costs from the cloud providers. As such, typically it's better to run specific parts of the integration battery
and skip these tests.
Integration tests aren't the end all beat all - in many cases what is fixed might not *HAVE* a test, so determining if it works means
checking the functionality of the system and making sure it does what it said it would do.
Pull requests for bug-fixes should reference the bug issue number they are fixing.
We encourage users to provide playbook examples for bugs that show how to reproduce the error, and these playbooks should be used to verify the bugfix does resolve
the issue if available. You may wish to also do your own review to poke the corners of the change.
Since some reproducers can be quite involved, you might wish to create a testing directory with the issue # as a sub-
directory to keep things organized::
mkdir -p testing/XXXX # where XXXX is again the issue # for the original issue or PR
cd testing/XXXX
<create files or git clone example playbook repo>
While it should go without saying, be sure to read any playbooks before you run them. VMs help with running untrusted content greatly,
though a playbook could still do something to your computing resources that you'd rather not like.
Once the files are in place, you can run the provided playbook (if there is one) to test the functionality::
ansible-playbook -vvv playbook_name.yml
If there's no playbook, you may have to copy and paste playbook snippets or run an ad-hoc command that was pasted in.
Our issue template also included sections for "Expected Output" and "Actual Output", which should be used to gauge the output
from the provided examples.
If the pull request resolves the issue, please leave a comment on the pull request, showing the following information:
* "Works for me!"
* The output from `ansible --version`.
In some cases, you may wish to share playbook output from the test run as well.
Example!::
Works for me! Tested on `Ansible 1.7.1`. I verified this on CentOS 6.5 and also Ubuntu 14.04.
If the PR does not resolve the issue, or if you see any failures from the unit/integration tests, just include that output instead::
This doesn't work for me.
When I ran this my toaster started making loud noises!
Output from the toaster looked like this:
```
BLARG
StrackTrace
RRRARRGGG
```
When you are done testing a feature branch, you can remove it with the following command::
git branch -D someuser-feature_branch_name
We understand some users may be inexperienced with git, or other aspects of the above procedure, so feel free to stop by ansible-devel
list for questions and we'd be happy to help answer them.

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Developer Information
=====================
Ansible Developer Guide
```````````````````````
Welcome to the Ansible Developer Guide!
The purpose of this guide is to document all of the paths available to you for interacting and shaping Ansible with code, ranging from developing modules and plugins to helping to develop the Ansible Core Engine via pull requests.
To get started, select one of the following topics.
.. toctree::
:maxdepth: 1
overview_architecture
overview_components
overview_contributing
developing_modules
developing_plugins
developing_inventory
developing_api
developing_core
developing_test_pr
developing_rebasing
developing_releases

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Ansible Architecture
====================
Ansible is a radically simple IT automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and many other IT needs.
Being designed for multi-tier deployments since day one, Ansible models your IT infrastructure by describing how all of your systems inter-relate, rather than just managing one system at a time.
It uses no agents and no additional custom security infrastructure, so it's easy to deploy - and most importantly, it uses a very simple language (YAML, in the form of Ansible Playbooks) that allow you to describe your automation jobs in a way that approaches plain English.
In this section, we'll give you a really quick overview of how Ansible works so you can see how the pieces fit together.
Modules
`````````````````
Ansible works by connecting to your nodes and pushing out small programs, called "Ansible Modules" to them. These programs are written to be resource models of the desired state of the system. Ansible then executes these modules (over SSH by default), and removes them when finished.
Your library of modules can reside on any machine, and there are no servers, daemons, or databases required. Typically you'll work with your favorite terminal program, a text editor, and probably a version control system to keep track of changes to your content.
Plugins
-------
Plugins are pieces of code that augment Ansible's core functionality. Ansible ships with a number of handy plugins, and you can easily write your own.
Inventory
````````````````````
By default, Ansible represents what machines it manages using a very simple INI file that puts all of your managed machines in groups of your own choosing.
To add new machines, there is no additional SSL signing server involved, so there's never any hassle deciding why a particular machine didnt get linked up due to obscure NTP or DNS issues.
If there's another source of truth in your infrastructure, Ansible can also plugin to that, such as drawing inventory, group, and variable information from sources like EC2, Rackspace, OpenStack, and more.
Here's what a plain text inventory file looks like::
---
[webservers]
www1.example.com
www2.example.com
[dbservers]
db0.example.com
db1.example.com
Once inventory hosts are listed, variables can be assigned to them in simple text files (in a subdirectory called 'group_vars/' or 'host_vars/' or directly in the inventory file.
Or, as already mentioned, use a dynamic inventory to pull your inventory from data sources like EC2, Rackspace, or OpenStack.
Playbooks
````````````````````
Playbooks can finely orchestrate multiple slices of your infrastructure topology, with very detailed control over how many machines to tackle at a time. This is where Ansible starts to get most interesting.
Ansible's approach to orchestration is one of finely-tuned simplicity, as we believe your automation code should make perfect sense to you years down the road and there should be very little to remember about special syntax or features.
Here's what a simple playbook looks like::
---
- hosts: webservers
serial: 5 # update 5 machines at a time
roles:
- common
- webapp
- hosts: content_servers
roles:
- common
- content
Extending Ansible with Plug-ins and the API
````````````````````````````````````````````
Should you want to write your own, Ansible modules can be written in any language that can return JSON (Ruby, Python, bash, etc). Inventory can also plug in to any datasource by writing a program that speaks to that datasource and returns JSON. There's also various Python APIs for extending Ansibles connection types (SSH is not the only transport possible), callbacks (how Ansible logs, etc), and even for adding new server side behaviors.

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==========
Repo Merge
==========
Background
----------
On Tuesday 6th December 2016, the Ansible Core Team re-merged the module repositories back into `ansible/ansible <https://github.com/ansible/ansible/>`_ in GitHub. The two module repos will be essentially locked, though they will be kept in place for the existing 2.1 and 2.2 dependencies. Once 2.2 moves out of official support (early 2018), these repositories will be fully readonly for all branches. Until then, any issues/PRs opened there will be auto-closed with a note to open it on `ansible/ansible <https://github.com/ansible/ansible/>`_.
Why Are We Doing This (Again...)?
-----------------------------------
For those who've been using Ansible long enough, you know that originally we started with a single repository. The original intention of the core vs. extras split was that core would be better supported/tested/etc. Extras would have been a bit more of a "wild-west" for modules, to allow new modules to make it into the distribution more quickly. Unfortunately this never really worked out, as well as the following:
1. Many modules in the core repo were also essentially "grand-fathered" in, despite not having a good set of tests or dedicated maintainers from the community.
2. The time in queue for modules to be merged into extras was not really any different from the time to merge modules into core.
3. The split introduced a few other problems for contributors such as having to submit multiple related PRs for modules with tests, or for those which rely on action plugins.
4. git submodules are notoriously complicated, even for contributors with decent git experience. The constant need to update git submodule pointers for devel and each stable branch can lead to testing surprises and really buys us nothing in terms of flexibility.
5. Users can already be confused about where to open issues, especially when the problem appears to be with a module but is actually an action plugin (ie. template) or something more fundamental like includes. Having everything back in one repo makes it easier to link issues, and you're always sure to open a bug report in the right place.
Metadata - Support/Ownership and Module Status
----------------------------------------------------------------------
As part of this move, we will be introducing module metadata, which will contain a couple of pieces of information regarding modules:
1. Support Status: This field indicates who supports the module, whether it's the core team, the community, the person who wrote it, or if it is an abandoned module which is not receiving regular updates. The Ansible team has gone through the list of modules and we have marked about 100 of them as "Core Supported", meaning a member of the Ansible core team should be actively fixing bugs on those modules. The vast majority of the rest will be community supported. This is not really a change from the status quo, this just makes it clearer.
2. Module Status: This field indicates how well supported that module may be. This generally applies to the maturity of the module's parameters, however, not necessarily its bug status.
The documentation pages for modules will be updated to reflect the above information as well, so that users can evaluate the status of a module before committing to using it in playbooks and roles.
.. _PRMover:
Move Issues and PRs to new Repo
-------------------------------
A tool has been developed to move a PR from the old repos to `ansible/ansible` this can be found at `prmover tool <https://prmover.pythonanywhere.com/>`_
Before using prmover please ensure you have a fork of the Ansible repo.
To move issues please use `GitHub Issue Mover <https://github-issue-mover.appspot.com/>`_
If you have *any* issues with updating your PR please ask for support in `#ansible-devel`
For support please use `#ansible-devel` on Freenode IRC

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Developing Modules
==================
.. contents:: Topics
Ansible modules are reusable, standalone scripts that can be used by the Ansible API,
or by the :command:`ansible` or :command:`ansible-playbook` programs. They
return information to ansible by printing a JSON string to stdout before
exiting. They take arguments in in one of several ways which we'll go into
as we work through this tutorial.
See :doc:`modules` for a list of various ones developed in core.
Modules can be written in any language and are found in the path specified
by :envvar:`ANSIBLE_LIBRARY` or the ``--module-path`` command line option.
By default, everything that ships with Ansible is pulled from its source tree, but
additional paths can be added.
The directory :file:`./library`, alongside your top level :term:`playbooks`, is also automatically
added as a search directory.
Should you develop an interesting Ansible module, consider sending a pull request to the
`modules-extras project <https://github.com/ansible/ansible-modules-extras>`_. There's also a core
repo for more established and widely used modules. "Extras" modules may be promoted to core periodically,
but there's no fundamental difference in the end - both ship with Ansible, all in one package, regardless
of how you acquire Ansible.
.. _module_dev_tutorial:
Tutorial
````````
Let's build a very-basic module to get and set the system time. For starters, let's build
a module that just outputs the current time.
We are going to use Python here but any language is possible. Only File I/O and outputting to standard
out are required. So, bash, C++, clojure, Python, Ruby, whatever you want
is fine.
Now Python Ansible modules contain some extremely powerful shortcuts (that all the core modules use)
but first we are going to build a module the very hard way. The reason we do this is because modules
written in any language OTHER than Python are going to have to do exactly this. We'll show the easy
way later.
So, here's an example. You would never really need to build a module to set the system time,
the 'command' module could already be used to do this.
Reading the modules that come with Ansible (linked above) is a great way to learn how to write
modules. Keep in mind, though, that some modules in Ansible's source tree are internalisms,
so look at :ref:`service` or :ref:`yum`, and don't stare too close into things like ``async_wrapper`` or
you'll turn to stone. Nobody ever executes ``async_wrapper`` directly.
Ok, let's get going with an example. We'll use Python. For starters, save this as a file named :file:`timetest.py`::
#!/usr/bin/python
import datetime
import json
date = str(datetime.datetime.now())
print json.dumps({
"time" : date
})
.. _module_testing:
Testing Modules
````````````````
There's a useful test script in the source checkout for Ansible::
git clone git://github.com/ansible/ansible.git --recursive
source ansible/hacking/env-setup
For instructions on setting up Ansible from source, please see
:doc:`intro_installation`.
Let's run the script you just wrote with that::
ansible/hacking/test-module -m ./timetest.py
You should see output that looks something like this::
{'time': '2012-03-14 22:13:48.539183'}
If you did not, you might have a typo in your module, so recheck it and try again.
.. _reading_input:
Reading Input
`````````````
Let's modify the module to allow setting the current time. We'll do this by seeing
if a key value pair in the form `time=<string>` is passed in to the module.
Ansible internally saves arguments to an arguments file. So we must read the file
and parse it. The arguments file is just a string, so any form of arguments are legal.
Here we'll do some basic parsing to treat the input as key=value.
The example usage we are trying to achieve to set the time is::
time time="March 14 22:10"
If no time parameter is set, we'll just leave the time as is and return the current time.
.. note::
This is obviously an unrealistic idea for a module. You'd most likely just
use the command module. However, it makes for a decent tutorial.
Let's look at the code. Read the comments as we'll explain as we go. Note that this
is highly verbose because it's intended as an educational example. You can write modules
a lot shorter than this::
#!/usr/bin/python
# import some python modules that we'll use. These are all
# available in Python's core
import datetime
import sys
import json
import os
import shlex
# read the argument string from the arguments file
args_file = sys.argv[1]
args_data = file(args_file).read()
# For this module, we're going to do key=value style arguments.
# Modules can choose to receive json instead by adding the string:
# WANT_JSON
# Somewhere in the file.
# Modules can also take free-form arguments instead of key-value or json
# but this is not recommended.
arguments = shlex.split(args_data)
for arg in arguments:
# ignore any arguments without an equals in it
if "=" in arg:
(key, value) = arg.split("=")
# if setting the time, the key 'time'
# will contain the value we want to set the time to
if key == "time":
# now we'll affect the change. Many modules
# will strive to be idempotent, generally
# by not performing any actions if the current
# state is the same as the desired state.
# See 'service' or 'yum' in the main git tree
# for an illustrative example.
rc = os.system("date -s \"%s\"" % value)
# always handle all possible errors
#
# when returning a failure, include 'failed'
# in the return data, and explain the failure
# in 'msg'. Both of these conventions are
# required however additional keys and values
# can be added.
if rc != 0:
print json.dumps({
"failed" : True,
"msg" : "failed setting the time"
})
sys.exit(1)
# when things do not fail, we do not
# have any restrictions on what kinds of
# data are returned, but it's always a
# good idea to include whether or not
# a change was made, as that will allow
# notifiers to be used in playbooks.
date = str(datetime.datetime.now())
print json.dumps({
"time" : date,
"changed" : True
})
sys.exit(0)
# if no parameters are sent, the module may or
# may not error out, this one will just
# return the time
date = str(datetime.datetime.now())
print json.dumps({
"time" : date
})
Let's test that module::
ansible/hacking/test-module -m ./timetest.py -a "time=\"March 14 12:23\""
This should return something like::
{"changed": true, "time": "2012-03-14 12:23:00.000307"}
.. _binary_module_reading_input:
Binary Modules Input
++++++++++++++++++++
Support for binary modules was added in Ansible 2.2. When Ansible detects a binary module, it will proceed to
supply the argument input as a file on ``argv[1]`` that is formatted as JSON. The JSON contents of that file
would resemble something similar to the following payload for a module accepting the same arguments as the
``ping`` module::
{
"data": "pong",
"_ansible_verbosity": 4,
"_ansible_diff": false,
"_ansible_debug": false,
"_ansible_check_mode": false,
"_ansible_no_log": false
}
.. _module_provided_facts:
Module Provided 'Facts'
````````````````````````
The :ref:`setup` module that ships with Ansible provides many variables about a system that can be used in playbooks
and templates. However, it's possible to also add your own facts without modifying the system module. To do
this, just have the module return a `ansible_facts` key, like so, along with other return data::
{
"changed" : True,
"rc" : 5,
"ansible_facts" : {
"leptons" : 5000,
"colors" : {
"red" : "FF0000",
"white" : "FFFFFF"
}
}
}
These 'facts' will be available to all statements called after that module (but not before) in the playbook.
A good idea might be to make a module called 'site_facts' and always call it at the top of each playbook, though
we're always open to improving the selection of core facts in Ansible as well.
.. _common_module_boilerplate:
Common Module Boilerplate
`````````````````````````
As mentioned, if you are writing a module in Python, there are some very powerful shortcuts you can use.
Modules are still transferred as one file, but an arguments file is no longer needed, so these are not
only shorter in terms of code, they are actually FASTER in terms of execution time.
Rather than mention these here, the best way to learn is to read some of the `source of the modules <https://github.com/ansible/ansible-modules-core>`_ that come with Ansible.
The 'group' and 'user' modules are reasonably non-trivial and showcase what this looks like.
Key parts include always importing the boilerplate code from
:mod:`ansible.module_utils.basic` like this::
from ansible.module_utils.basic import AnsibleModule
if __name__ == '__main__':
main()
.. note::
Prior to Ansible-2.1.0, importing only what you used from
:mod:`ansible.module_utils.basic` did not work. You needed to use
a wildcard import like this::
from ansible.module_utils.basic import *
And instantiating the module class like::
def main():
module = AnsibleModule(
argument_spec = dict(
state = dict(default='present', choices=['present', 'absent']),
name = dict(required=True),
enabled = dict(required=True, type='bool'),
something = dict(aliases=['whatever'])
)
)
The :class:`AnsibleModule` provides lots of common code for handling returns, parses your arguments
for you, and allows you to check inputs.
Successful returns are made like this::
module.exit_json(changed=True, something_else=12345)
And failures are just as simple (where `msg` is a required parameter to explain the error)::
module.fail_json(msg="Something fatal happened")
There are also other useful functions in the module class, such as :func:`module.sha1(path)`. See
:file:`lib/ansible/module_utils/basic.py` in the source checkout for implementation details.
Again, modules developed this way are best tested with the :file:`hacking/test-module` script in the git
source checkout. Because of the magic involved, this is really the only way the scripts
can function outside of Ansible.
If submitting a module to Ansible's core code, which we encourage, use of
:class:`AnsibleModule` is required.
.. _developing_for_check_mode:
Check Mode
``````````
.. versionadded:: 1.1
Modules may optionally support check mode. If the user runs Ansible in check
mode, the module should try to predict whether changes will occur.
For your module to support check mode, you must pass ``supports_check_mode=True``
when instantiating the AnsibleModule object. The AnsibleModule.check_mode attribute
will evaluate to True when check mode is enabled. For example::
module = AnsibleModule(
argument_spec = dict(...),
supports_check_mode=True
)
if module.check_mode:
# Check if any changes would be made but don't actually make those changes
module.exit_json(changed=check_if_system_state_would_be_changed())
Remember that, as module developer, you are responsible for ensuring that no
system state is altered when the user enables check mode.
If your module does not support check mode, when the user runs Ansible in check
mode, your module will simply be skipped.
.. _module_dev_pitfalls:
Common Pitfalls
```````````````
You should also never do this in a module::
print "some status message"
Because the output is supposed to be valid JSON.
Modules must not output anything on standard error, because the system will merge
standard out with standard error and prevent the JSON from parsing. Capturing standard
error and returning it as a variable in the JSON on standard out is fine, and is, in fact,
how the command module is implemented.
If a module returns stderr or otherwise fails to produce valid JSON, the actual output
will still be shown in Ansible, but the command will not succeed.
Don't write to files directly; use a temporary file and then use the `atomic_move` function from `ansibile.module_utils.basic` to move the updated temporary file into place. This prevents data corruption and ensures that the correct context for the file is kept.
Avoid creating a module that does the work of other modules; this leads to code duplication and divergence, and makes things less uniform, unpredictable and harder to maintain. Modules should be the building blocks. Instead of creating a module that does the work of other modules, use Plays and Roles instead.
Avoid creating 'caches'. Ansible is designed without a central server or authority, so you cannot guarantee it will not run with different permissions, options or locations. If you need a central authority, have it on top of Ansible (for example, using bastion/cm/ci server or tower); do not try to build it into modules.
Always use the hacking/test-module script when developing modules and it will warn
you about these kind of things.
.. _module_dev_conventions:
Conventions/Recommendations
```````````````````````````
As a reminder from the example code above, here are some basic conventions
and guidelines:
* If the module is addressing an object, the parameter for that object should be called 'name' whenever possible, or accept 'name' as an alias.
* If you have a company module that returns facts specific to your installations, a good name for this module is `site_facts`.
* Modules accepting boolean status should generally accept 'yes', 'no', 'true', 'false', or anything else a user may likely throw at them. The AnsibleModule common code supports this with "type='bool'".
* Include a minimum of dependencies if possible. If there are dependencies, document them at the top of the module file, and have the module raise JSON error messages when the import fails.
* Modules must be self-contained in one file to be auto-transferred by ansible.
* If packaging modules in an RPM, they only need to be installed on the control machine and should be dropped into /usr/share/ansible. This is entirely optional and up to you.
* Modules must output valid JSON only. The toplevel return type must be a hash (dictionary) although they can be nested. Lists or simple scalar values are not supported, though they can be trivially contained inside a dictionary.
* In the event of failure, a key of 'failed' should be included, along with a string explanation in 'msg'. Modules that raise tracebacks (stacktraces) are generally considered 'poor' modules, though Ansible can deal with these returns and will automatically convert anything unparseable into a failed result. If you are using the AnsibleModule common Python code, the 'failed' element will be included for you automatically when you call 'fail_json'.
* Return codes from modules are actually not significant, but continue on with 0=success and non-zero=failure for reasons of future proofing.
* As results from many hosts will be aggregated at once, modules should return only relevant output. Returning the entire contents of a log file is generally bad form.
.. _module_documenting:
Documenting Your Module
```````````````````````
All modules included in the CORE distribution must have a
``DOCUMENTATION`` string. This string MUST be a valid YAML document
which conforms to the schema defined below. You may find it easier to
start writing your ``DOCUMENTATION`` string in an editor with YAML
syntax highlighting before you include it in your Python file.
.. _module_doc_example:
Example
+++++++
See an example documentation string in the checkout under `examples/DOCUMENTATION.yml <https://github.com/ansible/ansible/blob/devel/examples/DOCUMENTATION.yml>`_.
Include it in your module file like this::
#!/usr/bin/python
# Copyright header....
DOCUMENTATION = '''
---
module: modulename
short_description: This is a sentence describing the module
# ... snip ...
'''
The ``description``, and ``notes`` fields
support formatting with some special macros.
These formatting functions are ``U()``, ``M()``, ``I()``, and ``C()``
for URL, module, italic, and constant-width respectively. It is suggested
to use ``C()`` for file and option names, and ``I()`` when referencing
parameters; module names should be specified as ``M(module)``.
Examples should be written in YAML format in plain text in an
``EXAMPLES`` string within the module like this::
EXAMPLES = '''
- modulename:
opt1: arg1
opt2: arg2
'''
The EXAMPLES section, just like the documentation section, is required in
all module pull requests for new modules.
The RETURN section documents what the module returns. For each value returned,
provide a ``description``, in what circumstances the value is ``returned``,
the ``type`` of the value and a ``sample``. For example, from
the ``copy`` module::
RETURN = '''
dest:
description: destination file/path
returned: success
type: string
sample: /path/to/file.txt
src:
description: source file used for the copy on the target machine
returned: changed
type: string
sample: /home/httpd/.ansible/tmp/ansible-tmp-1423796390.97-147729857856000/source
md5sum:
description: md5 checksum of the file after running copy
returned: when supported
type: string
sample: 2a5aeecc61dc98c4d780b14b330e3282
...
'''
.. _module_dev_testing:
Building & Testing
++++++++++++++++++
Put your completed module file into the 'library' directory and then
run the command: ``make webdocs``. The new 'modules.html' file will be
built and appear in the 'docsite/' directory.
.. tip::
If you're having a problem with the syntax of your YAML you can
validate it on the `YAML Lint <http://www.yamllint.com/>`_ website.
.. tip::
You can set the environment variable ANSIBLE_KEEP_REMOTE_FILES=1 on the controlling host to prevent ansible from
deleting the remote files so you can debug your module.
.. _debugging_ansiblemodule_based_modules:
Debugging AnsibleModule-based modules
`````````````````````````````````````
.. tip::
If you're using the :file:`hacking/test-module` script then most of this
is taken care of for you. If you need to do some debugging of the module
on the remote machine that the module will actually run on or when the
module is used in a playbook then you may need to use this information
instead of relying on test-module.
Starting with Ansible-2.1.0, AnsibleModule-based modules are put together as
a zip file consisting of the module file and the various python module
boilerplate inside of a wrapper script instead of as a single file with all of
the code concatenated together. Without some help, this can be harder to
debug as the file needs to be extracted from the wrapper in order to see
what's actually going on in the module. Luckily the wrapper script provides
some helper methods to do just that.
If you are using Ansible with the :envvar:`ANSIBLE_KEEP_REMOTE_FILES`
environment variables to keep the remote module file, here's a sample of how
your debugging session will start::
$ ANSIBLE_KEEP_REMOTE_FILES=1 ansible localhost -m ping -a 'data=debugging_session' -vvv
<127.0.0.1> ESTABLISH LOCAL CONNECTION FOR USER: badger
<127.0.0.1> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595 `" && echo "` echo $HOME/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595 `" )'
<127.0.0.1> PUT /var/tmp/tmpjdbJ1w TO /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping
<127.0.0.1> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping'
localhost | SUCCESS => {
"changed": false,
"invocation": {
"module_args": {
"data": "debugging_session"
},
"module_name": "ping"
},
"ping": "debugging_session"
}
Setting :envvar:`ANSIBLE_KEEP_REMOTE_FILES` to ``1`` tells Ansible to keep the
remote module files instead of deleting them after the module finishes
executing. Giving Ansible the ``-vvv`` optin makes Ansible more verbose.
That way it prints the file name of the temporary module file for you to see.
If you want to examine the wrapper file you can. It will show a small python
script with a large, base64 encoded string. The string contains the module
that is going to be executed. Run the wrapper's explode command to turn the
string into some python files that you can work with::
$ python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping explode
Module expanded into:
/home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/debug_dir
When you look into the debug_dir you'll see a directory structure like this::
├── ansible_module_ping.py
├── args
└── ansible
├── __init__.py
└── module_utils
├── basic.py
└── __init__.py
* :file:`ansible_module_ping.py` is the code for the module itself. The name
is based on the name of the module with a prefix so that we don't clash with
any other python module names. You can modify this code to see what effect
it would have on your module.
* The :file:`args` file contains a JSON string. The string is a dictionary
containing the module arguments and other variables that Ansible passes into
the module to change it's behaviour. If you want to modify the parameters
that are passed to the module, this is the file to do it in.
* The :file:`ansible` directory contains code from
:mod:`ansible.module_utils` that is used by the module. Ansible includes
files for any :`module:`ansible.module_utils` imports in the module but not
no files from any other module. So if your module uses
:mod:`ansible.module_utils.url` Ansible will include it for you, but if
your module includes :mod:`requests` then you'll have to make sure that
the python requests library is installed on the system before running the
module. You can modify files in this directory if you suspect that the
module is having a problem in some of this boilerplate code rather than in
the module code you have written.
Once you edit the code or arguments in the exploded tree you need some way to
run it. There's a separate wrapper subcommand for this::
$ python /home/badger/.ansible/tmp/ansible-tmp-1461434734.35-235318071810595/ping execute
{"invocation": {"module_args": {"data": "debugging_session"}}, "changed": false, "ping": "debugging_session"}
This subcommand takes care of setting the PYTHONPATH to use the exploded
:file:`debug_dir/ansible/module_utils` directory and invoking the script using
the arguments in the :file:`args` file. You can continue to run it like this
until you understand the problem. Then you can copy it back into your real
module file and test that the real module works via :command:`ansible` or
:command:`ansible-playbook`.
.. note::
The wrapper provides one more subcommand, ``excommunicate``. This
subcommand is very similar to ``execute`` in that it invokes the exploded
module on the arguments in the :file:`args`. The way it does this is
different, however. ``excommunicate`` imports the :func:`main`
function from the module and then calls that. This makes excommunicate
execute the module in the wrapper's process. This may be useful for
running the module under some graphical debuggers but it is very different
from the way the module is executed by Ansible itself. Some modules may
not work with ``excommunicate`` or may behave differently than when used
with Ansible normally. Those are not bugs in the module; they're
limitations of ``excommunicate``. Use at your own risk.
.. _module_paths:
Module Paths
````````````
If you are having trouble getting your module "found" by ansible, be
sure it is in the :envvar:`ANSIBLE_LIBRARY` environment variable.
If you have a fork of one of the ansible module projects, do something like this::
ANSIBLE_LIBRARY=~/ansible-modules-core:~/ansible-modules-extras
And this will make the items in your fork be loaded ahead of what ships with Ansible. Just be sure
to make sure you're not reporting bugs on versions from your fork!
To be safe, if you're working on a variant on something in Ansible's normal distribution, it's not
a bad idea to give it a new name while you are working on it, to be sure you know you're pulling
your version.
.. _module_contribution:
Getting Your Module Into Ansible
````````````````````````````````
High-quality modules with minimal dependencies
can be included in Ansible, but modules (just due to the programming
preferences of the developers) will need to be implemented in Python and use
the AnsibleModule common code, and should generally use consistent arguments with the rest of
the program. Stop by the mailing list to inquire about requirements if you like, and submit
a github pull request to the `extras <https://github.com/ansible/ansible-modules-extras>`_ project.
Included modules will ship with ansible, and also have a chance to be promoted to 'core' status, which
gives them slightly higher development priority (though they'll work in exactly the same way).
Module checklist
````````````````
The following checklist items are important guidelines for people who want to contribute to the development of modules to Ansible on GitHub. Please read the guidelines before you submit your PR/proposal.
* The shebang should always be ``#!/usr/bin/python``, this allows ansible_python_interpreter to work
* Modules must be written to support Python 2.4. If this is not possible, required minimum python version and rationale should be explained in the requirements section in DOCUMENTATION.
* Modules must be written to use proper Python-3 syntax. At some point in the future we'll come up with rules for running on Python-3 but we're not there yet. See :doc:`developing_modules_python3` for help on how to do this.
* Documentation: Make sure it exists
* Module documentation should briefly and accurately define what each module and option does, and how it works with others in the underlying system. Documentation should be written for broad audience--readable both by experts and non-experts. This documentation is not meant to teach a total novice, but it also should not be reserved for the Illuminati (hard balance).
* Descriptions should always start with a capital letter and end with a full stop. Consistency always helps.
* The `required` setting is only required when true, otherwise it is assumed to be false.
* If `required` is false/missing, `default` may be specified (assumed 'null' if missing). Ensure that the default parameter in docs matches default parameter in code.
* Documenting `default` is not needed for `required: true`.
* Remove unnecessary doc like `aliases: []` or `choices: []`.
* Do not use Boolean values in a choice list . For example, in the list `choices: ['no', 'verify', 'always]`, 'no' will be interpreted as a Boolean value (you can check basic.py for BOOLEANS_* constants to see the full list of Boolean keywords). If your option actually is a boolean, just use `type=bool`; there is no need to populate 'choices'.
* For new modules or options in a module add version_added. The version should match the value of the current development version and is a string (not a float), so be sure to enclose it in quotes.
* Verify that arguments in doc and module spec dict are identical.
* For password / secret arguments no_log=True should be set.
* Requirements should be documented, using the `requirements=[]` field.
* Author should be set, with their name and their github id, at the least.
* Ensure that you make use of U() for urls, C() for files and options, I() for params, M() for modules.
* If an optional parameter is sometimes required this need to be reflected in the documentation, e.g. "Required when C(state=present)."
* Verify that a GPL 3 License header is included.
* Does module use check_mode? Could it be modified to use it? Document it. Documentation is everyone's friend.
* Examples--include them whenever possible and make sure they are reproducible.
* Document the return structure of the module. Refer to :ref:`common_return_values` and :ref:`module_documenting` for additional information.
* Predictable user interface: This is a particularly important section as it is also an area where we need significant improvements.
* Name consistency across modules (weve gotten better at this, but we still have many deviations).
* Declarative operation (not CRUD)--this makes it easy for a user not to care what the existing state is, just about the final state. ``started/stopped``, ``present/absent``--don't overload options too much. It is preferable to add a new, simple option than to add choices/states that don't fit with existing ones.
* Keep options small, having them take large data structures might save us a few tasks, but adds a complex requirement that we cannot easily validate before passing on to the module.
* Allow an "expert mode". This may sound like the absolute opposite of the previous one, but it is always best to let expert users deal with complex data. This requires different modules in some cases, so that you end up having one (1) expert module and several 'piecemeal' ones (ec2_vpc_net?). The reason for this is not, as many users express, because it allows a single task and keeps plays small (which just moves the data complexity into vars files, leaving you with a slightly different structure in another YAML file). It does, however, allow for a more 'atomic' operation against the underlying APIs and services.
* Informative responses: Please note, that for >= 2.0, it is required that return data to be documented.
* Always return useful data, even when there is no change.
* Be consistent about returns (some modules are too random), unless it is detrimental to the state/action.
* Make returns reusable--most of the time you don't want to read it, but you do want to process it and re-purpose it.
* Return diff if in diff mode. This is not required for all modules, as it won't make sense for certain ones, but please attempt to include this when applicable).
* Code: This applies to all code in general, but often seems to be missing from modules, so please keep the following in mind as you work.
* Validate upfront--fail fast and return useful and clear error messages.
* Defensive programming--modules should be designed simply enough that this should be easy. Modules should always handle errors gracefully and avoid direct stacktraces. Ansible deals with this better in 2.0 and returns them in the results.
* Fail predictably--if we must fail, do it in a way that is the most expected. Either mimic the underlying tool or the general way the system works.
* Modules should not do the job of other modules, that is what roles are for. Less magic is more.
* Don't reinvent the wheel. Part of the problem is that code sharing is not that easy nor documented, we also need to expand our base functions to provide common patterns (retry, throttling, etc).
* Support check mode. This is not required for all modules, as it won't make sense for certain ones, but please attempt to include this when applicable). For more information, refer to :ref:`check_mode_drift` and :ref:`check_mode_dry`.
* Exceptions: The module must handle them. (exceptions are bugs)
* Give out useful messages on what you were doing and you can add the exception message to that.
* Avoid catchall exceptions, they are not very useful unless the underlying API gives very good error messages pertaining the attempted action.
* Module-dependent guidelines: Additional module guidelines may exist for certain families of modules.
* Be sure to check out the modules themselves for additional information.
* Amazon: https://github.com/ansible/ansible-modules-extras/blob/devel/cloud/amazon/GUIDELINES.md
* Modules should make use of the "extends_documentation_fragment" to ensure documentation available. For example, the AWS module should include::
extends_documentation_fragment:
- aws
- ec2
* The module must not use sys.exit() --> use fail_json() from the module object.
* Import custom packages in try/except and handled with fail_json() in main() e.g.::
try:
import foo
HAS_LIB=True
except:
HAS_LIB=False
* The return structure should be consistent, even if NA/None are used for keys normally returned under other options.
* Are module actions idempotent? If not document in the descriptions or the notes.
* Import module snippets `from ansible.module_utils.basic import *` at the bottom, conserves line numbers for debugging.
* The module must have a `main` function that wraps the normal execution.
* Call your :func:`main` from a conditional so that it would be possible to
import them into unittests in the future example::
if __name__ == '__main__':
main()
* Try to normalize parameters with other modules, you can have aliases for when user is more familiar with underlying API name for the option
* Being pep8 compliant is nice, but not a requirement. Specifically, the 80 column limit now hinders readability more that it improves it
* Avoid '`action`/`command`', they are imperative and not declarative, there are other ways to express the same thing
* Do not add `list` or `info` state options to an existing module - create a new `_facts` module.
* If you are asking 'how can I have a module execute other modules' ... you want to write a role
* Return values must be able to be serialized as json via the python stdlib
json library. basic python types (strings, int, dicts, lists, etc) are
serializable. A common pitfall is to try returning an object via
exit_json(). Instead, convert the fields you need from the object into the
fields of a dictionary and return the dictionary.
* When fetching URLs, please use either fetch_url or open_url from ansible.module_utils.urls
rather than urllib2; urllib2 does not natively verify TLS certificates and so is insecure for https.
* facts modules must return facts in the ansible_facts field of the result
dictionary. :ref:`module_provided_facts`
* modules that are purely about fact gathering need to implement check_mode.
they should not cause any changes anyway so it should be as simple as adding
check_mode=True when instantiating AnsibleModule. (The reason is that
playbooks which conditionalize based on fact information will only
conditionalize correctly in check_mode if the facts are returned in
check_mode).
* Basic auth: module_utils.api has some helpers for doing basic auth with
module_utils.urls.fetch_url(). If you use those you may find you also want
to fallback on environment variables for default values. If you do that,
be sure to use non-generic environment variables (like
:envvar:`API_<MODULENAME>_USERNAME`). Using generic environment variables
like :envvar:`API_USERNAME` would conflict between modules.
Windows modules checklist
`````````````````````````
* Favour native powershell and .net ways of doing things over calls to COM libraries or calls to native executables which may or may not be present in all versions of windows
* modules are in powershell (.ps1 files) but the docs reside in same name python file (.py)
* look at ansible/lib/ansible/module_utils/powershell.ps1 for common code, avoid duplication
* Ansible uses strictmode version 2.0 so be sure to test with that enabled
* start with::
#!powershell
then::
<GPL header>
then::
# WANT_JSON
# POWERSHELL_COMMON
then, to parse all arguments into a variable modules generally use::
$params = Parse-Args $args
* Arguments:
* Try and use state present and state absent like other modules
* You need to check that all your mandatory args are present. You can do this using the builtin Get-AnsibleParam function.
* Required arguments::
$package = Get-AnsibleParam -obj $params -name name -failifempty $true
* Required arguments with name validation::
$state = Get-AnsibleParam -obj $params -name "State" -ValidateSet "Present","Absent" -resultobj $resultobj -failifempty $true
* Optional arguments with name validation::
$state = Get-AnsibleParam -obj $params -name "State" -default "Present" -ValidateSet "Present","Absent"
* the If "FailIfEmpty" is true, the resultobj parameter is used to specify the object returned to fail-json. You can also override the default message
using $emptyattributefailmessage (for missing required attributes) and $ValidateSetErrorMessage (for attribute validation errors)
* Look at existing modules for more examples of argument checking.
* Results
* The result object should always contain an attribute called changed set to either $true or $false
* Create your result object like this::
$result = New-Object psobject @{
changed = $false
other_result_attribute = $some_value
};
If all is well, exit with a
Exit-Json $result
* Ensure anything you return, including errors can be converted to json.
* Be aware that because exception messages could contain almost anything.
* ConvertTo-Json will fail if it encounters a trailing \ in a string.
* If all is not well use Fail-Json to exit.
* Have you tested for powershell 3.0 and 4.0 compliance?
Deprecating and making module aliases
``````````````````````````````````````
Starting in 1.8, you can deprecate modules by renaming them with a preceding _, i.e. old_cloud.py to
_old_cloud.py. This keeps the module available, but hides it from the primary docs and listing.
You can also rename modules and keep an alias to the old name by using a symlink that starts with _.
This example allows the stat module to be called with fileinfo, making the following examples equivalent::
EXAMPLES = '''
ln -s stat.py _fileinfo.py
ansible -m stat -a "path=/tmp" localhost
ansible -m fileinfo -a "path=/tmp" localhost
'''
.. seealso::
:doc:`modules`
Learn about available modules
:doc:`developing_plugins`
Learn about developing plugins
:doc:`developing_api`
Learn about the Python API for playbook and task execution
`GitHub Core modules directory <https://github.com/ansible/ansible-modules-core/tree/devel>`_
Browse source of core modules
`Github Extras modules directory <https://github.com/ansible/ansible-modules-extras/tree/devel>`_
Browse source of extras modules.
`Mailing List <http://groups.google.com/group/ansible-devel>`_
Development mailing list
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Frequently Asked Questions
==========================
Here are some commonly-asked questions and their answers.
.. _set_environment:
How can I set the PATH or any other environment variable for a task or entire playbook?
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Setting environment variables can be done with the `environment` keyword. It can be used at task or play level::
environment:
PATH: "{{ ansible_env.PATH }}:/thingy/bin"
SOME: value
.. note:: starting in 2.0.1 the setup task from gather_facts also inherits the environment directive from the play, you might need to use the `|default` filter to avoid errors if setting this at play level.
How do I handle different machines needing different user accounts or ports to log in with?
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Setting inventory variables in the inventory file is the easiest way.
.. include:: ../rst_common/ansible_ssh_changes_note.rst
For instance, suppose these hosts have different usernames and ports::
[webservers]
asdf.example.com ansible_port=5000 ansible_user=alice
jkl.example.com ansible_port=5001 ansible_user=bob
You can also dictate the connection type to be used, if you want::
[testcluster]
localhost ansible_connection=local
/path/to/chroot1 ansible_connection=chroot
foo.example.com
bar.example.com
You may also wish to keep these in group variables instead, or file them in a group_vars/<groupname> file.
See the rest of the documentation for more information about how to organize variables.
.. _use_ssh:
How do I get ansible to reuse connections, enable Kerberized SSH, or have Ansible pay attention to my local SSH config file?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Switch your default connection type in the configuration file to 'ssh', or use '-c ssh' to use
Native OpenSSH for connections instead of the python paramiko library. In Ansible 1.2.1 and later, 'ssh' will be used
by default if OpenSSH is new enough to support ControlPersist as an option.
Paramiko is great for starting out, but the OpenSSH type offers many advanced options. You will want to run Ansible
from a machine new enough to support ControlPersist, if you are using this connection type. You can still manage
older clients. If you are using RHEL 6, CentOS 6, SLES 10 or SLES 11 the version of OpenSSH is still a bit old, so
consider managing from a Fedora or openSUSE client even though you are managing older nodes, or just use paramiko.
We keep paramiko as the default as if you are first installing Ansible on an EL box, it offers a better experience
for new users.
.. _use_ssh_jump_hosts:
How do I configure a jump host to access servers that I have no direct access to?
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
With Ansible 2, you can set a `ProxyCommand` in the
`ansible_ssh_common_args` inventory variable. Any arguments specified in
this variable are added to the sftp/scp/ssh command line when connecting
to the relevant host(s). Consider the following inventory group::
[gatewayed]
foo ansible_host=192.0.2.1
bar ansible_host=192.0.2.2
You can create `group_vars/gatewayed.yml` with the following contents::
ansible_ssh_common_args: '-o ProxyCommand="ssh -W %h:%p -q user@gateway.example.com"'
Ansible will append these arguments to the command line when trying to
connect to any hosts in the group `gatewayed`. (These arguments are used
in addition to any `ssh_args` from `ansible.cfg`, so you do not need to
repeat global `ControlPersist` settings in `ansible_ssh_common_args`.)
Note that `ssh -W` is available only with OpenSSH 5.4 or later. With
older versions, it's necessary to execute `nc %h:%p` or some equivalent
command on the bastion host.
With earlier versions of Ansible, it was necessary to configure a
suitable `ProxyCommand` for one or more hosts in `~/.ssh/config`,
or globally by setting `ssh_args` in `ansible.cfg`.
.. _ec2_cloud_performance:
How do I speed up management inside EC2?
++++++++++++++++++++++++++++++++++++++++
Don't try to manage a fleet of EC2 machines from your laptop. Connect to a management node inside EC2 first
and run Ansible from there.
.. _python_interpreters:
How do I handle python pathing not having a Python 2.X in /usr/bin/python on a remote machine?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
While you can write ansible modules in any language, most ansible modules are written in Python, and some of these
are important core ones.
By default Ansible assumes it can find a /usr/bin/python on your remote system that is a 2.X version of Python, specifically
2.4 or higher.
Setting of an inventory variable 'ansible_python_interpreter' on any host will allow Ansible to auto-replace the interpreter
used when executing python modules. Thus, you can point to any python you want on the system if /usr/bin/python on your
system does not point to a Python 2.X interpreter.
Some Linux operating systems, such as Arch, may only have Python 3 installed by default. This is not sufficient and you will
get syntax errors trying to run modules with Python 3. Python 3 is essentially not the same
language as Python 2. Ansible modules currently need to support older Pythons for users that still have Enterprise Linux 5 deployed, so they are not yet ported to run under Python 3.0. This is not a problem though as you can just install Python 2 also on a managed host.
Python 3.0 support will likely be addressed at a later point in time when usage becomes more mainstream.
Do not replace the shebang lines of your python modules. Ansible will do this for you automatically at deploy time.
.. _use_roles:
What is the best way to make content reusable/redistributable?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
If you have not done so already, read all about "Roles" in the playbooks documentation. This helps you make playbook content
self-contained, and works well with things like git submodules for sharing content with others.
If some of these plugin types look strange to you, see the API documentation for more details about ways Ansible can be extended.
.. _configuration_file:
Where does the configuration file live and what can I configure in it?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
See :doc:`intro_configuration`.
.. _who_would_ever_want_to_disable_cowsay_but_ok_here_is_how:
How do I disable cowsay?
++++++++++++++++++++++++
If cowsay is installed, Ansible takes it upon itself to make your day happier when running playbooks. If you decide
that you would like to work in a professional cow-free environment, you can either uninstall cowsay, or set an environment variable::
export ANSIBLE_NOCOWS=1
.. _browse_facts:
How do I see a list of all of the ansible\_ variables?
++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ansible by default gathers "facts" about the machines under management, and these facts can be accessed in Playbooks and in templates. To see a list of all of the facts that are available about a machine, you can run the "setup" module as an ad-hoc action::
ansible -m setup hostname
This will print out a dictionary of all of the facts that are available for that particular host. You might want to pipe the output to a pager.
.. _browse_inventory_vars:
How do I see all the inventory vars defined for my host?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
You can see the resulting vars you define in inventory running the following command::
ansible -m debug -a "var=hostvars['hostname']" localhost
.. _host_loops:
How do I loop over a list of hosts in a group, inside of a template?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A pretty common pattern is to iterate over a list of hosts inside of a host group, perhaps to populate a template configuration
file with a list of servers. To do this, you can just access the "$groups" dictionary in your template, like this:
.. code-block:: jinja
{% for host in groups['db_servers'] %}
{{ host }}
{% endfor %}
If you need to access facts about these hosts, for instance, the IP address of each hostname, you need to make sure that the facts have been populated. For example, make sure you have a play that talks to db_servers::
- hosts: db_servers
tasks:
- debug: msg="doesn't matter what you do, just that they were talked to previously."
Then you can use the facts inside your template, like this::
{% for host in groups['db_servers'] %}
{{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}
.. _programatic_access_to_a_variable:
How do I access a variable name programmatically?
+++++++++++++++++++++++++++++++++++++++++++++++++
An example may come up where we need to get the ipv4 address of an arbitrary interface, where the interface to be used may be supplied
via a role parameter or other input. Variable names can be built by adding strings together, like so::
{{ hostvars[inventory_hostname]['ansible_' + which_interface]['ipv4']['address'] }}
The trick about going through hostvars is necessary because it's a dictionary of the entire namespace of variables. 'inventory_hostname'
is a magic variable that indicates the current host you are looping over in the host loop.
.. _first_host_in_a_group:
How do I access a variable of the first host in a group?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
What happens if we want the ip address of the first webserver in the webservers group? Well, we can do that too. Note that if we
are using dynamic inventory, which host is the 'first' may not be consistent, so you wouldn't want to do this unless your inventory
was static and predictable. (If you are using :doc:`tower`, it will use database order, so this isn't a problem even if you are using cloud
based inventory scripts).
Anyway, here's the trick::
{{ hostvars[groups['webservers'][0]]['ansible_eth0']['ipv4']['address'] }}
Notice how we're pulling out the hostname of the first machine of the webservers group. If you are doing this in a template, you
could use the Jinja2 '#set' directive to simplify this, or in a playbook, you could also use set_fact::
- set_fact: headnode={{ groups[['webservers'][0]] }}
- debug: msg={{ hostvars[headnode].ansible_eth0.ipv4.address }}
Notice how we interchanged the bracket syntax for dots -- that can be done anywhere.
.. _file_recursion:
How do I copy files recursively onto a target host?
+++++++++++++++++++++++++++++++++++++++++++++++++++
The "copy" module has a recursive parameter, though if you want to do something more efficient for a large number of files, take a look at the "synchronize" module instead, which wraps rsync. See the module index for info on both of these modules.
.. _shell_env:
How do I access shell environment variables?
++++++++++++++++++++++++++++++++++++++++++++
If you just need to access existing variables, use the 'env' lookup plugin. For example, to access the value of the HOME
environment variable on management machine::
---
# ...
vars:
local_home: "{{ lookup('env','HOME') }}"
If you need to set environment variables, see the Advanced Playbooks section about environments.
Ansible 1.4 will also make remote environment variables available via facts in the 'ansible_env' variable::
{{ ansible_env.SOME_VARIABLE }}
.. _user_passwords:
How do I generate crypted passwords for the user module?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The mkpasswd utility that is available on most Linux systems is a great option::
mkpasswd --method=sha-512
If this utility is not installed on your system (e.g. you are using OS X) then you can still easily
generate these passwords using Python. First, ensure that the `Passlib <https://code.google.com/p/passlib/>`_
password hashing library is installed::
pip install passlib
Once the library is ready, SHA512 password values can then be generated as follows::
python -c "from passlib.hash import sha512_crypt; import getpass; print sha512_crypt.encrypt(getpass.getpass())"
Use the integrated :ref:`hash_filters` to generate a hashed version of a password.
You shouldn't put plaintext passwords in your playbook or host_vars; instead, use :doc:`playbooks_vault` to encrypt sensitive data.
.. _commercial_support:
Can I get training on Ansible?
++++++++++++++++++++++++++++++
Yes! See our `services page <http://www.ansible.com/consulting>`_ for information on our services and training offerings. Email `info@ansible.com <mailto:info@ansible.com>`_ for further details.
We also offer free web-based training classes on a regular basis. See our `webinar page <http://www.ansible.com/webinars-training>`_ for more info on upcoming webinars.
.. _web_interface:
Is there a web interface / REST API / etc?
++++++++++++++++++++++++++++++++++++++++++
Yes! Ansible, Inc makes a great product that makes Ansible even more powerful
and easy to use. See :doc:`tower`.
.. _docs_contributions:
How do I submit a change to the documentation?
++++++++++++++++++++++++++++++++++++++++++++++
Great question! Documentation for Ansible is kept in the main project git repository, and complete instructions for contributing can be found in the docs README `viewable on GitHub <https://github.com/ansible/ansible/blob/devel/docsite/README.md>`_. Thanks!
.. _keep_secret_data:
How do I keep secret data in my playbook?
+++++++++++++++++++++++++++++++++++++++++
If you would like to keep secret data in your Ansible content and still share it publicly or keep things in source control, see :doc:`playbooks_vault`.
In Ansible 1.8 and later, if you have a task that you don't want to show the results or command given to it when using -v (verbose) mode, the following task or playbook attribute can be useful::
- name: secret task
shell: /usr/bin/do_something --value={{ secret_value }}
no_log: True
This can be used to keep verbose output but hide sensitive information from others who would otherwise like to be able to see the output.
The no_log attribute can also apply to an entire play::
- hosts: all
no_log: True
Though this will make the play somewhat difficult to debug. It's recommended that this
be applied to single tasks only, once a playbook is completed. Note that the use of the
no_log attribute does not prevent data from being shown when debugging Ansible itself via
the ANSIBLE_DEBUG environment variable.
.. _when_to_use_brackets:
.. _dynamic_variables:
.. _interpolate_variables:
When should I use {{ }}? Also, how to interpolate variables or dynamic variable names
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A steadfast rule is 'always use {{ }} except when `when:`'.
Conditionals are always run through Jinja2 as to resolve the expression,
so `when:`, `failed_when:` and `changed_when:` are always templated and you should avoid adding `{{}}`.
In most other cases you should always use the brackets, even if previouslly you could use variables without specifying (like `with_` clauses),
as this made it hard to distinguish between an undefined variable and a string.
Another rule is 'moustaches don't stack'. We often see this::
{{ somevar_{{other_var}} }}
The above DOES NOT WORK, if you need to use a dynamic variable use the hostvars or vars dictionary as appropriate::
{{ hostvars[inventory_hostname]['somevar_' + other_var] }}
.. _i_dont_see_my_question:
Why don't you ship in X format?
+++++++++++++++++++++++++++++++
Several reasons, in most cases it has to do with maintainability, there are tons of ways to ship software and it is a herculean task to try to support them all.
In other cases there are technical issues, for example, for python wheels, our dependencies are not present so there is little to no gain.
I don't see my question here
++++++++++++++++++++++++++++
Please see the section below for a link to IRC and the Google Group, where you can ask your question there.
.. seealso::
:doc:`index`
The documentation index
:doc:`playbooks`
An introduction to playbooks
:doc:`playbooks_best_practices`
Best practices advice
`User Mailing List <http://groups.google.com/group/ansible-project>`_
Have a question? Stop by the google group!
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Ansible Galaxy
++++++++++++++
*Ansible Galaxy* refers to the `Galaxy <https://galaxy.ansible.com>`_ website where users can share roles, and to a command line tool for installing,
creating and managing roles.
.. contents:: Topics
The Website
```````````
`Galaxy <https://galaxy.ansible.com>`_, is a free site for finding, downloading, and sharing community developed roles. Downloading roles from Galaxy is
a great way to jumpstart your automation projects.
You can also use the site to share roles that you create. By authenticating with the site using your GitHub account, you're able to *import* roles, making
them available to the Ansible community. Imported roles become available in the Galaxy search index and visible on the site, allowing users to
discover and download them.
Learn more by viewing `the About page <https://galaxy.ansible.com/intro>`_.
The command line tool
`````````````````````
The ``ansible-galaxy`` command comes bundled with Ansible, and you can use it to install roles from Galaxy or directly from a git based SCM. You can
also use it to create a new role, remove roles, or perform tasks on the Galaxy website.
The command line tool by default communicates with the Galaxy website API using the server address *https://galaxy.ansible.com*. Since the `Galaxy project <https://github.com/ansible/galaxy>`_
is an open source project, you may be running your own internal Galaxy server and wish to override the default server address. You can do this using the *--server* option
or by setting the Galaxy server value in your *ansible.cfg* file. For information on setting the value in *ansible.cfg* visit `Galaxy Settings <./intro_configuration.html#galaxy-settings>`_.
Installing Roles
----------------
Use the ``ansible-galaxy`` command to download roles from the `Galaxy website <https://galaxy.ansible.com>`_
::
$ ansible-galaxy install username.role_name
roles_path
==========
Be aware that by default Ansible downloads roles to the path specified by the environment variable *ANSIBLE_ROLES_PATH*. This can be set to a series of
directories (i.e. */etc/ansible/roles:~/.ansible/roles*), in which case the first writable path will be used. When Ansible is first installed it defaults
to */etc/ansible/roles*, which requires *root* privileges.
You can override this by setting the environment variable in your session, defining *roles_path* in an *ansible.cfg* file, or by using the *--roles-path* option.
The following provides an example of using *--roles-path* to install the role into the current working directory:
::
$ ansible-galaxy install --roles-path . geerlingguy.apache
.. seealso::
:doc:`intro_configuration`
All about configuration files
version
=======
You can install a specific version of a role from Galaxy by appending a comma and the value of a GitHub release tag. For example:
::
$ ansible-galaxy install geerlingguy.apache,v1.0.0
It's also possible to point directly to the git repository and specify a branch name or commit hash as the version. For example, the following will
install a specific commit:
::
$ ansible-galaxy install git+https://github.com/geerlingguy/ansible-role-apache.git,0b7cd353c0250e87a26e0499e59e7fd265cc2f25
Installing multiple roles from a file
=====================================
Beginning with Ansible 1.8 it is possible to install multiple roles by including the roles in a *requirements.yml* file. The format of the file is YAML, and the
file extension must be either *.yml* or *.yaml*.
Use the following command to install roles included in *requirements.yml*:
::
$ ansible-galaxy install -r requirements.yml
Again, the extension is important. If the *.yml* extension is left off, the ``ansible-galaxy`` CLI assumes the file is in an older, now deprecated,
"basic" format.
Each role in the file will have one or more of the following attributes:
src
The source of the role. Use the format *username.role_name*, if downloading from Galaxy; otherwise, provide a URL pointing
to a repository within a git based SCM. See the examples below. This is a required attribute.
scm
Specify the SCM. As of this writing only *git* or *hg* are supported. See the examples below. Defaults to *git*.
version:
The version of the role to download. Provide a release tag value, commit hash, or branch name. Defaults to *master*.
name:
Download the role to a specific name. Defaults to the Galaxy name when downloading from Galaxy, otherwise it defaults
to the name of the repository.
Use the following example as a guide for specifying roles in *requirements.yml*:
::
# from galaxy
- src: yatesr.timezone
# from GitHub
- src: https://github.com/bennojoy/nginx
# from GitHub, overriding the name and specifying a specific tag
- src: https://github.com/bennojoy/nginx
version: master
name: nginx_role
# from a webserver, where the role is packaged in a tar.gz
- src: https://some.webserver.example.com/files/master.tar.gz
name: http-role
# from Bitbucket
- src: git+http://bitbucket.org/willthames/git-ansible-galaxy
version: v1.4
# from Bitbucket, alternative syntax and caveats
- src: http://bitbucket.org/willthames/hg-ansible-galaxy
scm: hg
# from GitLab or other git-based scm
- src: git@gitlab.company.com:mygroup/ansible-base.git
scm: git
version: "0.1" # quoted, so YAML doesn't parse this as a floating-point value
Dependencies
============
Roles can also be dependent on other roles, and when you install a role that has dependencies, those dependenices will automatically be installed.
You specify role dependencies in the *meta/main.yml* file by providing a list of roles. If the source of a role is Galaxy, you can simply specify the role in
the format *username.role_name*. The more complex format used in *requirements.yml* is also supported, allowing you to provide src, scm, version and name.
Dependencies found in Galaxy can be specified as follows:
::
dependencies:
- geerlingguy.apache
- geerlingguy.ansible
The complex form can also be used as follows:
::
dependencies:
- src: geerlingguy.ansible
- src: git+https://github.com/geerlingguy/ansible-role-composer.git
version: 775396299f2da1f519f0d8885022ca2d6ee80ee8
name: composer
When dependencies are encountered by ``ansible-galaxy``, it will automatically install each dependency to the *roles_path*. To understand how dependencies
are handled during play execution, see :doc:`playbooks_roles`.
.. note::
At the time of this writing, the Galaxy website expects all role dependencies to exist in Galaxy, and therefore dependencies to be specified in the
*username.role_name* format. If you import a role with a dependency where the *src* value is a URL, the import process will fail.
Create roles
------------
Use the ``init`` command to initialize the base structure of a new role, saving time on creating the various directories and main.yml files a role requires
::
$ ansible-galaxy init role_name
The above will create the following directory structure in the current working directory:
::
README.md
.travis.yml
defaults/
main.yml
files/
handlers/
main.yml
meta/
main.yml
templates/
tests/
inventory
test.yml
vars/
main.yml
Force
=====
If a directory matching the name of the role already exists in the current working directory, the init command will result in an error. To ignore the error
use the *--force* option. Force will create the above subdirectories and files, replacing anything that matches.
Container Enabled
=================
If you are creating a Container Enabled role, use the *--container-enabled* option. This will create the same directory structure as above, but populate it
with default files appropriate for a Container Enabled role. For instance, the README.md has a slightly different structure, the *.travis.yml* file tests
the role using `Ansible Container <https://github.com/ansible/ansible-container>`_, and the meta directory includes a *container.yml* file.
Search for roles
----------------
Search the Galaxy database by tags, platforms, author and multiple keywords. For example:
::
$ ansible-galaxy search elasticsearch --author geerlingguy
The search command will return a list of the first 1000 results matching your search:
::
Found 2 roles matching your search:
Name Description
---- -----------
geerlingguy.elasticsearch Elasticsearch for Linux.
geerlingguy.elasticsearch-curator Elasticsearch curator for Linux.
Get more information about a role
---------------------------------
Use the ``info`` command to view more detail about a specific role:
::
$ ansible-galaxy info username.role_name
This returns everything found in Galaxy for the role:
::
Role: username.role_name
description: Installs and configures a thing, a distributed, highly available NoSQL thing.
active: True
commit: c01947b7bc89ebc0b8a2e298b87ab416aed9dd57
commit_message: Adding travis
commit_url: https://github.com/username/repo_name/commit/c01947b7bc89ebc0b8a2e298b87ab
company: My Company, Inc.
created: 2015-12-08T14:17:52.773Z
download_count: 1
forks_count: 0
github_branch:
github_repo: repo_name
github_user: username
id: 6381
is_valid: True
issue_tracker_url:
license: Apache
min_ansible_version: 1.4
modified: 2015-12-08T18:43:49.085Z
namespace: username
open_issues_count: 0
path: /Users/username/projects/roles
scm: None
src: username.repo_name
stargazers_count: 0
travis_status_url: https://travis-ci.org/username/repo_name.svg?branch=master
version:
watchers_count: 1
List installed roles
--------------------
Use ``list`` to show the name and version of each role installed in the *roles_path*.
::
$ ansible-galaxy list
- chouseknecht.role-install_mongod, master
- chouseknecht.test-role-1, v1.0.2
- chrismeyersfsu.role-iptables, master
- chrismeyersfsu.role-required_vars, master
Remove an installed role
------------------------
Use ``remove`` to delete a role from *roles_path*:
::
$ ansible-galaxy remove username.role_name
Authenticate with Galaxy
------------------------
Using the ``import``, ``delete`` and ``setup`` commands to manage your roles on the Galaxy website requires authentication, and the ``login`` command
can be used to do just that. Before you can use the ``login`` command, you must create an account on the Galaxy website.
The ``login`` command requires using your GitHub credentials. You can use your username and password, or you can create a `personal access token <https://help.github.com/articles/creating-an-access-token-for-command-line-use/>`_. If you choose to create a token, grant minimal access to the token, as it is used just to verify identify.
The following shows authenticating with the Galaxy website using a GitHub username and password:
::
$ ansible-galaxy login
We need your GitHub login to identify you.
This information will not be sent to Galaxy, only to api.github.com.
The password will not be displayed.
Use --github-token if you do not want to enter your password.
Github Username: dsmith
Password for dsmith:
Successfully logged into Galaxy as dsmith
When you choose to use your username and password, your password is not sent to Galaxy. It is used to authenticates with GitHub and create a personal access token.
It then sends the token to Galaxy, which in turn verifies that your identity and returns a Galaxy access token. After authentication completes the GitHub token is
destroyed.
If you do not wish to use your GitHub password, or if you have two-factor authentication enabled with GitHub, use the *--github-token* option to pass a personal access token
that you create.
Import a role
-------------
The ``import`` command requires that you first authenticate using the ``login`` command. Once authenticated you can import any GitHub repository that you own or have
been granted access.
Use the following to import to role:
::
$ ansible-galaxy import github_user github_repo
By default the command will wait for Galaxy to complete the import process, displaying the results as the import progresses:
::
Successfully submitted import request 41
Starting import 41: role_name=myrole repo=githubuser/ansible-role-repo ref=
Retrieving GitHub repo githubuser/ansible-role-repo
Accessing branch: master
Parsing and validating meta/main.yml
Parsing galaxy_tags
Parsing platforms
Adding dependencies
Parsing and validating README.md
Adding repo tags as role versions
Import completed
Status SUCCESS : warnings=0 errors=0
Branch
======
Use the *--branch* option to import a specific branch. If not specified, the default branch for the repo will be used.
Role name
=========
By default the name given to the role will be derived from the GitHub repository name. However, you can use the *--role-name* option to override this and set the name.
No wait
=======
If the *--no-wait* option is present, the command will not wait for results. Results of the most recent import for any of your roles is available on the Galaxy web site
by visiting *My Imports*.
Delete a role
-------------
The ``delete`` command requires that you first authenticate using the ``login`` command. Once authenticated you can remove a role from the Galaxy web site. You are only allowed
to remove roles where you have access to the repository in GitHub.
Use the following to delete a role:
::
$ ansible-galaxy delete github_user github_repo
This only removes the role from Galaxy. It does not remove or alter the actual GitHub repository.
Travis integrations
-------------------
You can create an integration or connection between a role in Galaxy and `Travis <http://travis-ci.org>`_. Once the connection is established, a build in Travis will
automatically trigger an import in Galaxy, updating the search index with the latest information about the role.
You create the integration using the ``setup`` command, but before an integration can be created, you must first authenticate using the ``login`` command; you will
also need an account in Travis, and your Travis token. Once you're ready, use the following command to create the integration:
::
$ ansible-galaxy setup travis github_user github_repo xxx-travis-token-xxx
The setup command requires your Travis token, however the token is not stored in Galaxy. It is used along with the GitHub username and repo to create a hash as described
in `the Travis documentation <https://docs.travis-ci.com/user/notifications/>`_. The hash is stored in Galaxy and used to verify notifications received from Travis.
The setup command enables Galaxy to respond to notifications. To configure Travis to run a build on your repository and send a notification, follow the
`Travis getting started guide <https://docs.travis-ci.com/user/getting-started/>`_.
To instruct Travis to notify Galaxy when a build completes, add the following to your .travis.yml file:
::
notifications:
webhooks: https://galaxy.ansible.com/api/v1/notifications/
List Travis integrations
========================
Use the *--list* option to display your Travis integrations:
::
$ ansible-galaxy setup --list
ID Source Repo
---------- ---------- ----------
2 travis github_user/github_repo
1 travis github_user/github_repo
Remove Travis integrations
==========================
Use the *--remove* option to disable and remove a Travis integration:
::
$ ansible-galaxy setup --remove ID
Provide the ID of the integration to be disabled. You can find the ID by using the *--list* option.
.. seealso::
:doc:`playbooks_roles`
All about ansible roles
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Glossary
========
The following is a list (and re-explanation) of term definitions used elsewhere in the Ansible documentation.
Consult the documentation home page for the full documentation and to see the terms in context, but this should be a good resource
to check your knowledge of Ansible's components and understand how they fit together. It's something you might wish to read for review or
when a term comes up on the mailing list.
.. glossary::
Action
An action is a part of a task that specifies which of the modules to
run and which arguments to pass to that module. Each task can have
only one action, but it may also have other parameters.
Ad Hoc
Refers to running Ansible to perform some quick command, using
:command:`/usr/bin/ansible`, rather than the :term:`orchestration`
language, which is :command:`/usr/bin/ansible-playbook`. An example
of an ad hoc command might be rebooting 50 machines in your
infrastructure. Anything you can do ad hoc can be accomplished by
writing a :term:`playbook <playbooks>` and playbooks can also glue
lots of other operations together.
Async
Refers to a task that is configured to run in the background rather
than waiting for completion. If you have a long process that would
run longer than the SSH timeout, it would make sense to launch that
task in async mode. Async modes can poll for completion every so many
seconds or can be configured to "fire and forget", in which case
Ansible will not even check on the task again; it will just kick it
off and proceed to future steps. Async modes work with both
:command:`/usr/bin/ansible` and :command:`/usr/bin/ansible-playbook`.
Callback Plugin
Refers to some user-written code that can intercept results from
Ansible and do something with them. Some supplied examples in the
GitHub project perform custom logging, send email, or even play sound
effects.
Check Mode
Refers to running Ansible with the ``--check`` option, which does not
make any changes on the remote systems, but only outputs the changes
that might occur if the command ran without this flag. This is
analogous to so-called "dry run" modes in other systems, though the
user should be warned that this does not take into account unexpected
command failures or cascade effects (which is true of similar modes in
other systems). Use this to get an idea of what might happen, but do
not substitute it for a good staging environment.
Connection Plugin
By default, Ansible talks to remote machines through pluggable
libraries. Ansible supports native OpenSSH (:term:`SSH (Native)`) or
a Python implementation called :term:`paramiko`. OpenSSH is preferred
if you are using a recent version, and also enables some features like
Kerberos and jump hosts. This is covered in the :ref:`getting
started section <remote_connection_information>`. There are also
other connection types like ``accelerate`` mode, which must be
bootstrapped over one of the SSH-based connection types but is very
fast, and local mode, which acts on the local system. Users can also
write their own connection plugins.
Conditionals
A conditional is an expression that evaluates to true or false that
decides whether a given task is executed on a given machine or not.
Ansible's conditionals are powered by the 'when' statement, which are
discussed in the :doc:`playbook documentation <playbooks>`.
Declarative
An approach to achieving a task that uses a description of the
final state rather than a description of the sequence of steps
necessary to achieve that state. For a real world example, a
declarative specification of a task would be: "put me in California".
Depending on your current location, the sequence of steps to get you to
California may vary, and if you are already in California, nothing
at all needs to be done. Ansible's Resources are declarative; it
figures out the steps needed to achieve the final state. It also lets
you know whether or not any steps needed to be taken to get to the
final state.
Diff Mode
A ``--diff`` flag can be passed to Ansible to show what changed on
modules that support it. You can combine it with ``--check`` to get a
good 'dry run'. File diffs are normally in unified diff format.
Executor
A core software component of Ansible that is the power behind
:command:`/usr/bin/ansible` directly -- and corresponds to the
invocation of each task in a :term:`playbook <playbooks>`. The
Executor is something Ansible developers may talk about, but it's not
really user land vocabulary.
Facts
Facts are simply things that are discovered about remote nodes. While
they can be used in :term:`playbooks` and templates just like
variables, facts are things that are inferred, rather than set. Facts
are automatically discovered by Ansible when running plays by
executing the internal :ref:`setup module <setup>` on the remote nodes. You
never have to call the setup module explicitly, it just runs, but it
can be disabled to save time if it is not needed or you can tell
ansible to collect only a subset of the full facts via the
``gather_subset:`` option. For the convenience of users who are
switching from other configuration management systems, the fact module
will also pull in facts from the :program:`ohai` and :program:`facter`
tools if they are installed. These are fact libraries from Chef and
Puppet, respectively. (These may also be disabled via
``gather_subset:``)
Filter Plugin
A filter plugin is something that most users will never need to
understand. These allow for the creation of new :term:`Jinja2`
filters, which are more or less only of use to people who know what
Jinja2 filters are. If you need them, you can learn how to write them
in the :ref:`API docs section <developing_filter_plugins>`.
Forks
Ansible talks to remote nodes in parallel and the level of parallelism
can be set either by passing ``--forks`` or editing the default in
a configuration file. The default is a very conservative five (5)
forks, though if you have a lot of RAM, you can easily set this to
a value like 50 for increased parallelism.
Gather Facts (Boolean)
:term:`Facts` are mentioned above. Sometimes when running a multi-play
:term:`playbook <playbooks>`, it is desirable to have some plays that
don't bother with fact computation if they aren't going to need to
utilize any of these values. Setting ``gather_facts: False`` on
a playbook allows this implicit fact gathering to be skipped.
Globbing
Globbing is a way to select lots of hosts based on wildcards, rather
than the name of the host specifically, or the name of the group they
are in. For instance, it is possible to select ``ww*`` to match all
hosts starting with ``www``. This concept is pulled directly from
:program:`Func`, one of Michael DeHaan's (an Ansible Founder) earlier
projects. In addition to basic globbing, various set operations are
also possible, such as 'hosts in this group and not in another group',
and so on.
Group
A group consists of several hosts assigned to a pool that can be
conveniently targeted together, as well as given variables that they
share in common.
Group Vars
The :file:`group_vars/` files are files that live in a directory
alongside an inventory file, with an optional filename named after
each group. This is a convenient place to put variables that are
provided to a given group, especially complex data structures, so that
these variables do not have to be embedded in the :term:`inventory`
file or :term:`playbook <playbooks>`.
Handlers
Handlers are just like regular tasks in an Ansible
:term:`playbook <playbooks>` (see :term:`Tasks`) but are only run if
the Task contains a ``notify`` directive and also indicates that it
changed something. For example, if a config file is changed, then the
task referencing the config file templating operation may notify
a service restart handler. This means services can be bounced only if
they need to be restarted. Handlers can be used for things other than
service restarts, but service restarts are the most common usage.
Host
A host is simply a remote machine that Ansible manages. They can have
individual variables assigned to them, and can also be organized in
groups. All hosts have a name they can be reached at (which is either
an IP address or a domain name) and, optionally, a port number, if they
are not to be accessed on the default SSH port.
Host Specifier
Each :term:`Play <plays>` in Ansible maps a series of :term:`tasks` (which define the role,
purpose, or orders of a system) to a set of systems.
This ``hosts:`` directive in each play is often called the hosts specifier.
It may select one system, many systems, one or more groups, or even
some hosts that are in one group and explicitly not in another.
Host Vars
Just like :term:`Group Vars`, a directory alongside the inventory file named
:file:`host_vars/` can contain a file named after each hostname in the
inventory file, in :term:`YAML` format. This provides a convenient place to
assign variables to the host without having to embed them in the
:term:`inventory` file. The Host Vars file can also be used to define complex
data structures that can't be represented in the inventory file.
Idempotency
An operation is idempotent if the result of performing it once is
exactly the same as the result of performing it repeatedly without
any intervening actions.
Includes
The idea that :term:`playbook <playbooks>` files (which are nothing
more than lists of :term:`plays`) can include other lists of plays,
and task lists can externalize lists of :term:`tasks` in other files,
and similarly with :term:`handlers`. Includes can be parameterized,
which means that the loaded file can pass variables. For instance, an
included play for setting up a WordPress blog may take a parameter
called ``user`` and that play could be included more than once to
create a blog for both ``alice`` and ``bob``.
Inventory
A file (by default, Ansible uses a simple INI format) that describes
:term:`Hosts <Host>` and :term:`Groups <Group>` in Ansible. Inventory
can also be provided via an :term:`Inventory Script` (sometimes called
an "External Inventory Script").
Inventory Script
A very simple program (or a complicated one) that looks up
:term:`hosts <Host>`, :term:`group` membership for hosts, and variable
information from an external resource -- whether that be a SQL
database, a CMDB solution, or something like LDAP. This concept was
adapted from Puppet (where it is called an "External Nodes
Classifier") and works more or less exactly the same way.
Jinja2
Jinja2 is the preferred templating language of Ansible's template
module. It is a very simple Python template language that is
generally readable and easy to write.
JSON
Ansible uses JSON for return data from remote modules. This allows
modules to be written in any language, not just Python.
Lazy Evaluation
In general, Ansible evaluates any variables in
:term:`playbook <playbooks>` content at the last possible second,
which means that if you define a data structure that data structure
itself can define variable values within it, and everything "just
works" as you would expect. This also means variable strings can
include other variables inside of those strings.
Library
A collection of modules made available to :command:`/usr/bin/ansible`
or an Ansible :term:`playbook <playbooks>`.
Limit Groups
By passing ``--limit somegroup`` to :command:`ansible` or
:command:`ansible-playbook`, the commands can be limited to a subset
of :term:`hosts <Host>`. For instance, this can be used to run
a :term:`playbook <playbooks>` that normally targets an entire set of
servers to one particular server.
Local Action
A local_action directive in a :term:`playbook <playbooks>` targeting
remote machines means that the given step will actually occur on the
local machine, but that the variable ``{{ ansible_hostname }}`` can be
passed in to reference the remote hostname being referred to in that
step. This can be used to trigger, for example, an rsync operation.
Local Connection
By using ``connection: local`` in a :term:`playbook <playbooks>`, or
passing ``-c local`` to :command:`/usr/bin/ansible`, this indicates
that we are managing the local host and not a remote machine.
Lookup Plugin
A lookup plugin is a way to get data into Ansible from the outside
world. These are how such things as ``with_items``, a basic looping
plugin, are implemented. There are also lookup plugins like
``with_file`` which load data from a file and ones for querying
environment variables, DNS text records, or key value stores. Lookup
plugins can also be accessed in templates, e.g.,
``{{ lookup('file','/path/to/file') }}``.
Loops
Generally, Ansible is not a programming language. It prefers to be
more declarative, though various constructs like ``with_items`` allow
a particular task to be repeated for multiple items in a list.
Certain modules, like :ref:`yum <yum>` and :ref:`apt <apt>`, are actually
optimized for this, and can install all packages given in those lists
within a single transaction, dramatically speeding up total time to
configuration.
Modules
Modules are the units of work that Ansible ships out to remote
machines. Modules are kicked off by either
:command:`/usr/bin/ansible` or :command:`/usr/bin/ansible-playbook`
(where multiple tasks use lots of different modules in conjunction).
Modules can be implemented in any language, including Perl, Bash, or
Ruby -- but can leverage some useful communal library code if written
in Python. Modules just have to return :term:`JSON`. Once modules are
executed on remote machines, they are removed, so no long running
daemons are used. Ansible refers to the collection of available
modules as a :term:`library`.
Multi-Tier
The concept that IT systems are not managed one system at a time, but
by interactions between multiple systems and groups of systems in
well defined orders. For instance, a web server may need to be
updated before a database server and pieces on the web server may
need to be updated after *THAT* database server and various load
balancers and monitoring servers may need to be contacted. Ansible
models entire IT topologies and workflows rather than looking at
configuration from a "one system at a time" perspective.
Notify
The act of a :term:`task <tasks>` registering a change event and
informing a :term:`handler <handlers>` task that another
:term:`action` needs to be run at the end of the :term:`play <plays>`. If
a handler is notified by multiple tasks, it will still be run only
once. Handlers are run in the order they are listed, not in the order
that they are notified.
Orchestration
Many software automation systems use this word to mean different
things. Ansible uses it as a conductor would conduct an orchestra.
A datacenter or cloud architecture is full of many systems, playing
many parts -- web servers, database servers, maybe load balancers,
monitoring systems, continuous integration systems, etc. In
performing any process, it is necessary to touch systems in particular
orders, often to simulate rolling updates or to deploy software
correctly. Some system may perform some steps, then others, then
previous systems already processed may need to perform more steps.
Along the way, emails may need to be sent or web services contacted.
Ansible orchestration is all about modeling that kind of process.
paramiko
By default, Ansible manages machines over SSH. The library that
Ansible uses by default to do this is a Python-powered library called
paramiko. The paramiko library is generally fast and easy to manage,
though users desiring Kerberos or Jump Host support may wish to switch
to a native SSH binary such as OpenSSH by specifying the connection
type in their :term:`playbooks`, or using the ``-c ssh`` flag.
Playbooks
Playbooks are the language by which Ansible orchestrates, configures,
administers, or deploys systems. They are called playbooks partially
because it's a sports analogy, and it's supposed to be fun using them.
They aren't workbooks :)
Plays
A :term:`playbook <playbooks>` is a list of plays. A play is
minimally a mapping between a set of :term:`hosts <Host>` selected by a host
specifier (usually chosen by :term:`groups <Group>` but sometimes by
hostname :term:`globs <Globbing>`) and the :term:`tasks` which run on those
hosts to define the role that those systems will perform. There can be
one or many plays in a playbook.
Pull Mode
By default, Ansible runs in :term:`push mode`, which allows it very
fine-grained control over when it talks to each system. Pull mode is
provided for when you would rather have nodes check in every N minutes
on a particular schedule. It uses a program called
:command:`ansible-pull` and can also be set up (or reconfigured) using
a push-mode :term:`playbook <playbooks>`. Most Ansible users use push
mode, but pull mode is included for variety and the sake of having
choices.
:command:`ansible-pull` works by checking configuration orders out of
git on a crontab and then managing the machine locally, using the
:term:`local connection` plugin.
Push Mode
Push mode is the default mode of Ansible. In fact, it's not really
a mode at all -- it's just how Ansible works when you aren't thinking
about it. Push mode allows Ansible to be fine-grained and conduct
nodes through complex orchestration processes without waiting for them
to check in.
Register Variable
The result of running any :term:`task <tasks>` in Ansible can be
stored in a variable for use in a template or a conditional statement.
The keyword used to define the variable is called ``register``, taking
its name from the idea of registers in assembly programming (though
Ansible will never feel like assembly programming). There are an
infinite number of variable names you can use for registration.
Resource Model
Ansible modules work in terms of resources. For instance, the
:ref:`file module <file>` will select a particular file and ensure
that the attributes of that resource match a particular model. As an
example, we might wish to change the owner of :file:`/etc/motd` to
``root`` if it is not already set to ``root``, or set its mode to
``0644`` if it is not already set to ``0644``. The resource models
are :term:`idempotent <idempotency>` meaning change commands are not
run unless needed, and Ansible will bring the system back to a desired
state regardless of the actual state -- rather than you having to tell
it how to get to the state.
Roles
Roles are units of organization in Ansible. Assigning a role to
a group of :term:`hosts <Host>` (or a set of :term:`groups <group>`,
or :term:`host patterns <Globbing>`, etc.) implies that they should
implement a specific behavior. A role may include applying certain
variable values, certain :term:`tasks`, and certain :term:`handlers`
-- or just one or more of these things. Because of the file structure
associated with a role, roles become redistributable units that allow
you to share behavior among :term:`playbooks` -- or even with other users.
Rolling Update
The act of addressing a number of nodes in a group N at a time to
avoid updating them all at once and bringing the system offline. For
instance, in a web topology of 500 nodes handling very large volume,
it may be reasonable to update 10 or 20 machines at a time, moving on
to the next 10 or 20 when done. The ``serial:`` keyword in an Ansible
:term:`playbooks` control the size of the rolling update pool. The
default is to address the batch size all at once, so this is something
that you must opt-in to. OS configuration (such as making sure config
files are correct) does not typically have to use the rolling update
model, but can do so if desired.
Serial
.. seealso::
:term:`Rolling Update`
Sudo
Ansible does not require root logins, and since it's daemonless,
definitely does not require root level daemons (which can be
a security concern in sensitive environments). Ansible can log in and
perform many operations wrapped in a sudo command, and can work with
both password-less and password-based sudo. Some operations that
don't normally work with sudo (like scp file transfer) can be achieved
with Ansible's :ref:`copy <copy>`, :ref:`template <template>`, and
:ref:`fetch <fetch>` modules while running in sudo mode.
SSH (Native)
Native OpenSSH as an Ansible transport is specified with ``-c ssh``
(or a config file, or a directive in the :term:`playbook <playbooks>`)
and can be useful if wanting to login via Kerberized SSH or using SSH
jump hosts, etc. In 1.2.1, ``ssh`` will be used by default if the
OpenSSH binary on the control machine is sufficiently new.
Previously, Ansible selected ``paramiko`` as a default. Using
a client that supports ``ControlMaster`` and ``ControlPersist`` is
recommended for maximum performance -- if you don't have that and
don't need Kerberos, jump hosts, or other features, ``paramiko`` is
a good choice. Ansible will warn you if it doesn't detect
ControlMaster/ControlPersist capability.
Tags
Ansible allows tagging resources in a :term:`playbook <playbooks>`
with arbitrary keywords, and then running only the parts of the
playbook that correspond to those keywords. For instance, it is
possible to have an entire OS configuration, and have certain steps
labeled ``ntp``, and then run just the ``ntp`` steps to reconfigure
the time server information on a remote host.
Tasks
:term:`Playbooks` exist to run tasks. Tasks combine an :term:`action`
(a module and its arguments) with a name and optionally some other
keywords (like :term:`looping directives <loops>`). :term:`Handlers`
are also tasks, but they are a special kind of task that do not run
unless they are notified by name when a task reports an underlying
change on a remote system.
Templates
Ansible can easily transfer files to remote systems but often it is
desirable to substitute variables in other files. Variables may come
from the :term:`inventory` file, :term:`Host Vars`, :term:`Group
Vars`, or :term:`Facts`. Templates use the :term:`Jinja2` template
engine and can also include logical constructs like loops and if
statements.
Transport
Ansible uses :term:``Connection Plugins`` to define types of available
transports. These are simply how Ansible will reach out to managed
systems. Transports included are :term:`paramiko`,
:term:`ssh <SSH (Native)>` (using OpenSSH), and
:term:`local <Local Connection>`.
When
An optional conditional statement attached to a :term:`task <tasks>` that is used to
determine if the task should run or not. If the expression following
the ``when:`` keyword evaluates to false, the task will be ignored.
Vars (Variables)
As opposed to :term:`Facts`, variables are names of values (they can
be simple scalar values -- integers, booleans, strings) or complex
ones (dictionaries/hashes, lists) that can be used in templates and
:term:`playbooks`. They are declared things, not things that are
inferred from the remote system's current state or nature (which is
what Facts are).
YAML
Ansible does not want to force people to write programming language
code to automate infrastructure, so Ansible uses YAML to define
:term:`playbook <playbooks>` configuration languages and also variable
files. YAML is nice because it has a minimum of syntax and is very
clean and easy for people to skim. It is a good data format for
configuration files and humans, but also machine readable. Ansible's
usage of YAML stemmed from Michael DeHaan's first use of it inside of
Cobbler around 2006. YAML is fairly popular in the dynamic language
community and the format has libraries available for serialization in
many languages (Python, Perl, Ruby, etc.).
.. seealso::
:doc:`faq`
Frequently asked questions
:doc:`playbooks`
An introduction to playbooks
:doc:`playbooks_best_practices`
Best practices advice
`User Mailing List <http://groups.google.com/group/ansible-devel>`_
Have a question? Stop by the google group!
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Amazon Web Services Guide
=========================
.. _aws_intro:
Introduction
````````````
Ansible contains a number of modules for controlling Amazon Web Services (AWS). The purpose of this
section is to explain how to put Ansible modules together (and use inventory scripts) to use Ansible in AWS context.
Requirements for the AWS modules are minimal.
All of the modules require and are tested against recent versions of boto. You'll need this Python module installed on your control machine. Boto can be installed from your OS distribution or python's "pip install boto".
Whereas classically ansible will execute tasks in its host loop against multiple remote machines, most cloud-control steps occur on your local machine with reference to the regions to control.
In your playbook steps we'll typically be using the following pattern for provisioning steps::
- hosts: localhost
connection: local
gather_facts: False
tasks:
- ...
.. _aws_authentication:
Authentication
``````````````
Authentication with the AWS-related modules is handled by either
specifying your access and secret key as ENV variables or module arguments.
For environment variables::
export AWS_ACCESS_KEY_ID='AK123'
export AWS_SECRET_ACCESS_KEY='abc123'
For storing these in a vars_file, ideally encrypted with ansible-vault::
---
ec2_access_key: "--REMOVED--"
ec2_secret_key: "--REMOVED--"
.. _aws_provisioning:
Provisioning
````````````
The ec2 module provisions and de-provisions instances within EC2.
An example of making sure there are only 5 instances tagged 'Demo' in EC2 follows.
In the example below, the "exact_count" of instances is set to 5. This means if there are 0 instances already existing, then
5 new instances would be created. If there were 2 instances, only 3 would be created, and if there were 8 instances, 3 instances would
be terminated.
What is being counted is specified by the "count_tag" parameter. The parameter "instance_tags" is used to apply tags to the newly created
instance.::
# demo_setup.yml
- hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Provision a set of instances
ec2:
key_name: my_key
group: test
instance_type: t2.micro
image: "{{ ami_id }}"
wait: true
exact_count: 5
count_tag:
Name: Demo
instance_tags:
Name: Demo
register: ec2
The data about what instances are created is being saved by the "register" keyword in the variable named "ec2".
From this, we'll use the add_host module to dynamically create a host group consisting of these new instances. This facilitates performing configuration actions on the hosts immediately in a subsequent task.::
# demo_setup.yml
- hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Provision a set of instances
ec2:
key_name: my_key
group: test
instance_type: t2.micro
image: "{{ ami_id }}"
wait: true
exact_count: 5
count_tag:
Name: Demo
instance_tags:
Name: Demo
register: ec2
- name: Add all instance public IPs to host group
add_host: hostname={{ item.public_ip }} groups=ec2hosts
with_items: "{{ ec2.instances }}"
With the host group now created, a second play at the bottom of the the same provisioning playbook file might now have some configuration steps::
# demo_setup.yml
- name: Provision a set of instances
hosts: localhost
# ... AS ABOVE ...
- hosts: ec2hosts
name: configuration play
user: ec2-user
gather_facts: true
tasks:
- name: Check NTP service
service: name=ntpd state=started
.. _aws_host_inventory:
Host Inventory
``````````````
Once your nodes are spun up, you'll probably want to talk to them again. With a cloud setup, it's best to not maintain a static list of cloud hostnames
in text files. Rather, the best way to handle this is to use the ec2 dynamic inventory script. See :doc:`intro_dynamic_inventory`.
This will also dynamically select nodes that were even created outside of Ansible, and allow Ansible to manage them.
See :doc:`intro_dynamic_inventory` for how to use this, then flip back over to this chapter.
.. _aws_tags_and_groups:
Tags And Groups And Variables
`````````````````````````````
When using the ec2 inventory script, hosts automatically appear in groups based on how they are tagged in EC2.
For instance, if a host is given the "class" tag with the value of "webserver",
it will be automatically discoverable via a dynamic group like so::
- hosts: tag_class_webserver
tasks:
- ping
Using this philosophy can be a great way to keep systems separated by the function they perform.
In this example, if we wanted to define variables that are automatically applied to each machine tagged with the 'class' of 'webserver', 'group_vars'
in ansible can be used. See :ref:`splitting_out_vars`.
Similar groups are available for regions and other classifications, and can be similarly assigned variables using the same mechanism.
.. _aws_pull:
Autoscaling with Ansible Pull
`````````````````````````````
Amazon Autoscaling features automatically increase or decrease capacity based on load. There are also Ansible modules shown in the cloud documentation that
can configure autoscaling policy.
When nodes come online, it may not be sufficient to wait for the next cycle of an ansible command to come along and configure that node.
To do this, pre-bake machine images which contain the necessary ansible-pull invocation. Ansible-pull is a command line tool that fetches a playbook from a git server and runs it locally.
One of the challenges of this approach is that there needs to be a centralized way to store data about the results of pull commands in an autoscaling context.
For this reason, the autoscaling solution provided below in the next section can be a better approach.
Read :ref:`ansible-pull` for more information on pull-mode playbooks.
.. _aws_autoscale:
Autoscaling with Ansible Tower
``````````````````````````````
:doc:`tower` also contains a very nice feature for auto-scaling use cases. In this mode, a simple curl script can call
a defined URL and the server will "dial out" to the requester and configure an instance that is spinning up. This can be a great way
to reconfigure ephemeral nodes. See the Tower install and product documentation for more details.
A benefit of using the callback in Tower over pull mode is that job results are still centrally recorded and less information has to be shared
with remote hosts.
.. _aws_cloudformation_example:
Ansible With (And Versus) CloudFormation
````````````````````````````````````````
CloudFormation is a Amazon technology for defining a cloud stack as a JSON document.
Ansible modules provide an easier to use interface than CloudFormation in many examples, without defining a complex JSON document.
This is recommended for most users.
However, for users that have decided to use CloudFormation, there is an Ansible module that can be used to apply a CloudFormation template
to Amazon.
When using Ansible with CloudFormation, typically Ansible will be used with a tool like Packer to build images, and CloudFormation will launch
those images, or ansible will be invoked through user data once the image comes online, or a combination of the two.
Please see the examples in the Ansible CloudFormation module for more details.
.. _aws_image_build:
AWS Image Building With Ansible
```````````````````````````````
Many users may want to have images boot to a more complete configuration rather than configuring them entirely after instantiation. To do this,
one of many programs can be used with Ansible playbooks to define and upload a base image, which will then get its own AMI ID for usage with
the ec2 module or other Ansible AWS modules such as ec2_asg or the cloudformation module. Possible tools include Packer, aminator, and Ansible's
ec2_ami module.
Generally speaking, we find most users using Packer.
See the Packer documentation of the `Ansible local Packer provisioner <https://www.packer.io/docs/provisioners/ansible-local.html>`_ and `Ansible remote Packer provisioner <https://www.packer.io/docs/provisioners/ansible.html>`_.
If you do not want to adopt Packer at this time, configuring a base-image with Ansible after provisioning (as shown above) is acceptable.
.. _aws_next_steps:
Next Steps: Explore Modules
```````````````````````````
Ansible ships with lots of modules for configuring a wide array of EC2 services. Browse the "Cloud" category of the module
documentation for a full list with examples.
.. seealso::
:doc:`modules`
All the documentation for Ansible modules
:doc:`playbooks`
An introduction to playbooks
:doc:`playbooks_delegation`
Delegation, useful for working with loud balancers, clouds, and locally executed steps.
`User Mailing List <http://groups.google.com/group/ansible-devel>`_
Have a question? Stop by the google group!
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Getting Started with Azure
==========================
Ansible includes a suite of modules for interacting with Azure Resource Manager, giving you the tools to easily create
and orchestrate infrastructure on the Microsoft Azure Cloud.
Requirements
------------
Using the Azure Resource Manager modules requires having `Azure Python SDK <https://github.com/Azure/azure-sdk-for-python>`_
installed on the host running Ansible. You will need to have == v2.0.0RC5 installed. The simplest way to install the
SDK is via pip:
.. code-block:: bash
$ pip install "azure==2.0.0rc5"
Authenticating with Azure
-------------------------
Using the Azure Resource Manager modules requires authenticating with the Azure API. You can choose from two authentication strategies:
* Active Directory Username/Password
* Service Principal Credentials
Follow the directions for the strategy you wish to use, then proceed to `Providing Credentials to Azure Modules`_ for
instructions on how to actually use the modules and authenticate with the Azure API.
Using Service Principal
.......................
There is now a detailed official tutorial describing `how to create a service principal <https://azure.microsoft.com/en-us/documentation/articles/resource-group-create-service-principal-portal/>`_.
After stepping through the tutorial you will have:
* Your Client ID, which is found in the “client id” box in the “Configure” page of your application in the Azure portal
* Your Secret key, generated when you created the application. You cannot show the key after creation.
If you lost the key, you must create a new one in the “Configure” page of your application.
* And finally, a tenant ID. Its a UUID (e.g. ABCDEFGH-1234-ABCD-1234-ABCDEFGHIJKL) pointing to the AD containing your
application. You will find it in the URL from within the Azure portal, or in the “view endpoints” of any given URL.
Using Active Directory Username/Password
........................................
To create an Active Directory username/password:
* Connect to the Azure Classic Portal with your admin account
* Create a user in your default AAD. You must NOT activate Multi-Factor Authentication
* Go to Settings - Administrators
* Click on Add and enter the email of the new user.
* Check the checkbox of the subscription you want to test with this user.
* Login to Azure Portal with this new user to change the temporary password to a new one. You will not be able to use the
temporary password for OAuth login.
Providing Credentials to Azure Modules
......................................
The modules offer several ways to provide your credentials. For a CI/CD tool such as Ansible Tower or Jenkins, you will
most likely want to use environment variables. For local development you may wish to store your credentials in a file
within your home directory. And of course, you can always pass credentials as parameters to a task within a playbook. The
order of precedence is parameters, then environment variables, and finally a file found in your home directory.
Using Environment Variables
```````````````````````````
To pass service principal credentials via the environment, define the following variables:
* AZURE_CLIENT_ID
* AZURE_SECRET
* AZURE_SUBSCRIPTION_ID
* AZURE_TENANT
To pass Active Directory username/password via the environment, define the following variables:
* AZURE_AD_USER
* AZURE_PASSWORD
* AZURE_SUBSCRIPTION_ID
Storing in a File
`````````````````
When working in a development environment, it may be desirable to store credentials in a file. The modules will look
for credentials in $HOME/.azure/credentials. This file is an ini style file. It will look as follows:
.. code-block:: ini
[default]
subscription_id=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
client_id=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
secret=xxxxxxxxxxxxxxxxx
tenant=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
It is possible to store multiple sets of credentials within the credentials file by creating multiple sections. Each
section is considered a profile. The modules look for the [default] profile automatically. Define AZURE_PROFILE in the
environment or pass a profile parameter to specify a specific profile.
Passing as Parameters
`````````````````````
If you wish to pass credentials as parameters to a task, use the following parameters for service principal:
* client_id
* secret
* subscription_id
* tenant
Or, pass the following parameters for Active Directory username/password:
* ad_user
* password
* subscription_id
Creating Virtual Machines
-------------------------
There are two ways to create a virtual machine, both involving the azure_rm_virtualmachine module. We can either create
a storage account, network interface, security group and public IP address and pass the names of these objects to the
module as parameters, or we can let the module do the work for us and accept the defaults it chooses.
Creating Individual Components
..............................
An Azure module is available to help you create a storage account, virtual network, subnet, network interface,
security group and public IP. Here is a full example of creating each of these and passing the names to the
azure_rm_virtualmachine module at the end:
.. code-block:: yaml
- name: Create storage account
azure_rm_storageaccount:
resource_group: Testing
name: testaccount001
account_type: Standard_LRS
- name: Create virtual network
azure_rm_virtualnetwork:
resource_group: Testing
name: testvn001
address_prefixes: "10.10.0.0/16"
- name: Add subnet
azure_rm_subnet:
resource_group: Testing
name: subnet001
address_prefix: "10.10.0.0/24"
virtual_network: testvn001
- name: Create public ip
azure_rm_publicipaddress:
resource_group: Testing
allocation_method: Static
name: publicip001
- name: Create security group that allows SSH
azure_rm_securitygroup:
resource_group: Testing
name: secgroup001
rules:
- name: SSH
protocol: Tcp
destination_port_range: 22
access: Allow
priority: 101
direction: Inbound
- name: Create NIC
azure_rm_networkinterface:
resource_group: Testing
name: testnic001
virtual_network: testvn001
subnet: subnet001
public_ip_name: publicip001
security_group: secgroup001
- name: Create virtual machine
azure_rm_virtualmachine:
resource_group: Testing
name: testvm001
vm_size: Standard_D1
storage_account: testaccount001
storage_container: testvm001
storage_blob: testvm001.vhd
admin_username: admin
admin_password: Password!
network_interfaces: testnic001
image:
offer: CentOS
publisher: OpenLogic
sku: '7.1'
version: latest
Each of the Azure modules offers a variety of parameter options. Not all options are demonstrated in the above example.
See each individual module for further details and examples.
Creating a Virtual Machine with Default Options
...............................................
If you simply want to create a virtual machine without specifying all the details, you can do that as well. The only
caveat is that you will need a virtual network with one subnet already in your resource group. Assuming you have a
virtual network already with an existing subnet, you can run the following to create a VM:
.. code-block:: yaml
azure_rm_virtualmachine:
resource_group: Testing
name: testvm10
vm_size: Standard_D1
admin_username: chouseknecht
ssh_password: false
ssh_public_keys: "{{ ssh_keys }}"
image:
offer: CentOS
publisher: OpenLogic
sku: '7.1'
version: latest
Dynamic Inventory Script
------------------------
If you are not familiar with Ansible's dynamic inventory scripts, check out `Intro to Dynamic Inventory <http://docs.ansible.com/ansible/intro_dynamic_inventory.html>`_.
The Azure Resource Manager inventory script is called azure_rm.py. It authenticates with the Azure API exactly the same as the
Azure modules, which means you will either define the same environment variables described above in `Using Environment Variables`_,
create a $HOME/.azure/credentials file (also described above in `Storing in a File`_), or pass command line parameters. To see available command
line options execute the following:
.. code-block:: bash
$ ./ansible/contrib/inventory/azure_rm.py --help
As with all dynamic inventory scripts, the script can be executed directly, passed as a parameter to the ansible command,
or passed directly to ansible-playbook using the -i option. No matter how it is executed the script produces JSON representing
all of the hosts found in your Azure subscription. You can narrow this down to just hosts found in a specific set of
Azure resource groups, or even down to a specific host.
For a given host, the inventory script provides the following host variables:
.. code-block:: JSON
{
"ansible_host": "XXX.XXX.XXX.XXX",
"computer_name": "computer_name2",
"fqdn": null,
"id": "/subscriptions/subscription-id/resourceGroups/galaxy-production/providers/Microsoft.Compute/virtualMachines/object-name",
"image": {
"offer": "CentOS",
"publisher": "OpenLogic",
"sku": "7.1",
"version": "latest"
},
"location": "westus",
"mac_address": "00-00-5E-00-53-FE",
"name": "object-name",
"network_interface": "interface-name",
"network_interface_id": "/subscriptions/subscription-id/resourceGroups/galaxy-production/providers/Microsoft.Network/networkInterfaces/object-name1",
"network_security_group": null,
"network_security_group_id": null,
"os_disk": {
"name": "object-name",
"operating_system_type": "Linux"
},
"plan": null,
"powerstate": "running",
"private_ip": "172.26.3.6",
"private_ip_alloc_method": "Static",
"provisioning_state": "Succeeded",
"public_ip": "XXX.XXX.XXX.XXX",
"public_ip_alloc_method": "Static",
"public_ip_id": "/subscriptions/subscription-id/resourceGroups/galaxy-production/providers/Microsoft.Network/publicIPAddresses/object-name",
"public_ip_name": "object-name",
"resource_group": "galaxy-production",
"security_group": "object-name",
"security_group_id": "/subscriptions/subscription-id/resourceGroups/galaxy-production/providers/Microsoft.Network/networkSecurityGroups/object-name",
"tags": {
"db": "mysql"
},
"type": "Microsoft.Compute/virtualMachines",
"virtual_machine_size": "Standard_DS4"
}
Host Groups
...........
By default hosts are grouped by:
* azure (all hosts)
* location name
* resource group name
* security group name
* tag key
* tag key_value
You can control host groupings and host selection by either defining environment variables or creating an
azure_rm.ini file in your current working directory.
NOTE: An .ini file will take precedence over environment variables.
NOTE: The name of the .ini file is the basename of the inventory script (i.e. 'azure_rm') with a '.ini'
extension. This allows you to copy, rename and customize the inventory script and have matching .ini files all in
the same directory.
Control grouping using the following variables defined in the environment:
* AZURE_GROUP_BY_RESOURCE_GROUP=yes
* AZURE_GROUP_BY_LOCATION=yes
* AZURE_GROUP_BY_SECURITY_GROUP=yes
* AZURE_GROUP_BY_TAG=yes
Select hosts within specific resource groups by assigning a comma separated list to:
* AZURE_RESOURCE_GROUPS=resource_group_a,resource_group_b
Select hosts for specific tag key by assigning a comma separated list of tag keys to:
* AZURE_TAGS=key1,key2,key3
Select hosts for specific locations by assigning a comma separated list of locations to:
* AZURE_LOCATIONS=eastus,eastus2,westus
Or, select hosts for specific tag key:value pairs by assigning a comma separated list key:value pairs to:
* AZURE_TAGS=key1:value1,key2:value2
If you don't need the powerstate, you can improve performance by turning off powerstate fetching:
* AZURE_INCLUDE_POWERSTATE=no
A sample azure_rm.ini file is included along with the inventory script in contrib/inventory. An .ini
file will contain the following:
.. code-block:: ini
[azure]
# Control which resource groups are included. By default all resources groups are included.
# Set resource_groups to a comma separated list of resource groups names.
#resource_groups=
# Control which tags are included. Set tags to a comma separated list of keys or key:value pairs
#tags=
# Control which locations are included. Set locations to a comma separated list of locations.
#locations=
# Include powerstate. If you don't need powerstate information, turning it off improves runtime performance.
# Valid values: yes, no, true, false, True, False, 0, 1.
include_powerstate=yes
# Control grouping with the following boolean flags. Valid values: yes, no, true, false, True, False, 0, 1.
group_by_resource_group=yes
group_by_location=yes
group_by_security_group=yes
group_by_tag=yes
Examples
........
Here are some examples using the inventory script:
.. code-block:: bash
# Execute /bin/uname on all instances in the Testing resource group
$ ansible -i azure_rm.py Testing -m shell -a "/bin/uname -a"
# Use the inventory script to print instance specific information
$ ./ansible/contrib/inventory/azure_rm.py --host my_instance_host_name --resource-groups=Testing --pretty
# Use the inventory script with ansible-playbook
$ ansible-playbook -i ./ansible/contrib/inventory/azure_rm.py test_playbook.yml
Here is a simple playbook to exercise the Azure inventory script:
.. code-block:: yaml
- name: Test the inventory script
hosts: azure
connection: local
gather_facts: no
tasks:
- debug: msg="{{ inventory_hostname }} has powerstate {{ powerstate }}"
You can execute the playbook with something like:
.. code-block:: bash
$ ansible-playbook -i ./ansible/contrib/inventory/azure_rm.py test_azure_inventory.yml

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CloudStack Cloud Guide
======================
.. _cloudstack_introduction:
Introduction
````````````
The purpose of this section is to explain how to put Ansible modules together to use Ansible in a CloudStack context. You will find more usage examples in the details section of each module.
Ansible contains a number of extra modules for interacting with CloudStack based clouds. All modules support check mode, are designed to be idempotent, have been created and tested, and are maintained by the community.
.. note:: Some of the modules will require domain admin or root admin privileges.
Prerequisites
`````````````
Prerequisites for using the CloudStack modules are minimal. In addition to ansible itself, all of the modules require the python library ``cs`` https://pypi.python.org/pypi/cs.
You'll need this Python module installed on the execution host, usually your workstation.
.. code-block:: bash
$ pip install cs
.. note:: cs also includes a command line interface for ad-hoc interaction with the CloudStack API e.g. ``$ cs listVirtualMachines state=Running``.
Limitations and Known Issues
````````````````````````````
VPC support is not yet fully implemented and tested. The community is working on the VPC integration.
Credentials File
````````````````
You can pass credentials and the endpoint of your cloud as module arguments, however in most cases it is a far less work to store your credentials in the cloudstack.ini file.
The python library cs looks for the credentials file in the following order (last one wins):
* A ``.cloudstack.ini`` (note the dot) file in the home directory.
* A ``CLOUDSTACK_CONFIG`` environment variable pointing to an .ini file.
* A ``cloudstack.ini`` (without the dot) file in the current working directory, same directory as your playbooks are located.
The structure of the ini file must look like this:
.. code-block:: bash
$ cat $HOME/.cloudstack.ini
[cloudstack]
endpoint = https://cloud.example.com/client/api
key = api key
secret = api secret
.. Note:: The section ``[cloudstack]`` is the default section. ``CLOUDSTACK_REGION`` environment variable can be used to define the default section.
Regions
```````
If you use more than one CloudStack region, you can define as many sections as you want and name them as you like, e.g.:
.. code-block:: bash
$ cat $HOME/.cloudstack.ini
[exoscale]
endpoint = https://api.exoscale.ch/compute
key = api key
secret = api secret
[exmaple_cloud_one]
endpoint = https://cloud-one.example.com/client/api
key = api key
secret = api secret
[exmaple_cloud_two]
endpoint = https://cloud-two.example.com/client/api
key = api key
secret = api secret
.. Hint:: Sections can also be used to for login into the same region using different accounts.
By passing the argument ``api_region`` with the CloudStack modules, the region wanted will be selected.
.. code-block:: yaml
- name: ensure my ssh public key exists on Exoscale
local_action: cs_sshkeypair
name: my-ssh-key
public_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
api_region: exoscale
Or by looping over a regions list if you want to do the task in every region:
.. code-block:: yaml
- name: ensure my ssh public key exists in all CloudStack regions
local_action: cs_sshkeypair
name: my-ssh-key
public_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
api_region: "{{ item }}"
with_items:
- exoscale
- exmaple_cloud_one
- exmaple_cloud_two
Environment Variables
`````````````````````
.. versionadded:: 2.3
Since Ansible 2.3 it is possible to use environment variables for domain (``CLOUDSTACK_DOMAIN``), account (``CLOUDSTACK_ACCOUNT``), project (``CLOUDSTACK_PROJECT``), VPC (``CLOUDSTACK_VPC``) and zone (``CLOUDSTACK_ZONE``). This simplifies the tasks by not repeating the arguments for every tasks.
Below you see an example how it can be used in combination with Ansible's block feature:
.. code-block:: yaml
- hosts: cloud-vm
tasks:
- block:
- name: ensure my ssh public key
local_action:
module: cs_sshkeypair
name: my-ssh-key
public_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
- name: ensure my ssh public key
local_action:
module: cs_instance:
display_name: "{{ inventory_hostname_short }}"
template: Linux Debian 7 64-bit 20GB Disk
service_offering: "{{ cs_offering }}"
ssh_key: my-ssh-key
state: running
environment:
CLOUDSTACK_DOMAIN: root/customers
CLOUDSTACK_PROJECT: web-app
CLOUDSTACK_ZONE: sf-1
.. Note:: You are still able overwrite the environment variables using the module arguments, e.g. ``zone: sf-2``
.. Note:: Unlike ``CLOUDSTACK_REGION`` these additional environment variables are ingored in the CLI ``cs``.
Use Cases
`````````
The following should give you some ideas how to use the modules to provision VMs to the cloud. As always, there isn't only one way to do it. But as always: keep it simple for the beginning is always a good start.
Use Case: Provisioning in a Advanced Networking CloudStack setup
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Our CloudStack cloud has an advanced networking setup, we would like to provision web servers, which get a static NAT and open firewall ports 80 and 443. Further we provision database servers, to which we do not give any access to. For accessing the VMs by SSH we use a SSH jump host.
This is how our inventory looks like:
.. code-block:: ini
[cloud-vm:children]
webserver
db-server
jumphost
[webserver]
web-01.example.com public_ip=198.51.100.20
web-02.example.com public_ip=198.51.100.21
[db-server]
db-01.example.com
db-02.example.com
[jumphost]
jump.example.com public_ip=198.51.100.22
As you can see, the public IPs for our web servers and jumphost has been assigned as variable ``public_ip`` directly in the inventory.
The configure the jumphost, web servers and database servers, we use ``group_vars``. The ``group_vars`` directory contains 4 files for configuration of the groups: cloud-vm, jumphost, webserver and db-server. The cloud-vm is there for specifying the defaults of our cloud infrastructure.
.. code-block:: yaml
# file: group_vars/cloud-vm
---
cs_offering: Small
cs_firewall: []
Our database servers should get more CPU and RAM, so we define to use a ``Large`` offering for them.
.. code-block:: yaml
# file: group_vars/db-server
---
cs_offering: Large
The web servers should get a ``Small`` offering as we would scale them horizontally, which is also our default offering. We also ensure the known web ports are opened for the world.
.. code-block:: yaml
# file: group_vars/webserver
---
cs_firewall:
- { port: 80 }
- { port: 443 }
Further we provision a jump host which has only port 22 opened for accessing the VMs from our office IPv4 network.
.. code-block:: yaml
# file: group_vars/jumphost
---
cs_firewall:
- { port: 22, cidr: "17.17.17.0/24" }
Now to the fun part. We create a playbook to create our infrastructure we call it ``infra.yml``:
.. code-block:: yaml
# file: infra.yaml
---
- name: provision our VMs
hosts: cloud-vm
connection: local
tasks:
- name: ensure VMs are created and running
cs_instance:
name: "{{ inventory_hostname_short }}"
template: Linux Debian 7 64-bit 20GB Disk
service_offering: "{{ cs_offering }}"
state: running
- name: ensure firewall ports opened
cs_firewall:
ip_address: "{{ public_ip }}"
port: "{{ item.port }}"
cidr: "{{ item.cidr | default('0.0.0.0/0') }}"
with_items: "{{ cs_firewall }}"
when: public_ip is defined
- name: ensure static NATs
cs_staticnat: vm="{{ inventory_hostname_short }}" ip_address="{{ public_ip }}"
when: public_ip is defined
In the above play we defined 3 tasks and use the group ``cloud-vm`` as target to handle all VMs in the cloud but instead SSH to these VMs, we use ``connetion=local`` to execute the API calls locally from our workstation.
In the first task, we ensure we have a running VM created with the Debian template. If the VM is already created but stopped, it would just start it. If you like to change the offering on an existing VM, you must add ``force: yes`` to the task, which would stop the VM, change the offering and start the VM again.
In the second task we ensure the ports are opened if we give a public IP to the VM.
In the third task we add static NAT to the VMs having a public IP defined.
.. Note:: The public IP addresses must have been acquired in advance, also see ``cs_ip_address``
.. Note:: For some modules, e.g. ``cs_sshkeypair`` you usually want this to be executed only once, not for every VM. Therefore you would make a separate play for it targeting localhost. You find an example in the use cases below.
Use Case: Provisioning on a Basic Networking CloudStack setup
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A basic networking CloudStack setup is slightly different: Every VM gets a public IP directly assigned and security groups are used for access restriction policy.
This is how our inventory looks like:
.. code-block:: ini
[cloud-vm:children]
webserver
[webserver]
web-01.example.com
web-02.example.com
The default for your VMs looks like this:
.. code-block:: yaml
# file: group_vars/cloud-vm
---
cs_offering: Small
cs_securitygroups: [ 'default']
Our webserver will also be in security group ``web``:
.. code-block:: yaml
# file: group_vars/webserver
---
cs_securitygroups: [ 'default', 'web' ]
The playbook looks like the following:
.. code-block:: yaml
# file: infra.yaml
---
- name: cloud base setup
hosts: localhost
connection: local
tasks:
- name: upload ssh public key
cs_sshkeypair:
name: defaultkey
public_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
- name: ensure security groups exist
cs_securitygroup:
name: "{{ item }}"
with_items:
- default
- web
- name: add inbound SSH to security group default
cs_securitygroup_rule:
security_group: default
start_port: "{{ item }}"
end_port: "{{ item }}"
with_items:
- 22
- name: add inbound TCP rules to security group web
cs_securitygroup_rule:
security_group: web
start_port: "{{ item }}"
end_port: "{{ item }}"
with_items:
- 80
- 443
- name: install VMs in the cloud
hosts: cloud-vm
connection: local
tasks:
- name: create and run VMs on CloudStack
cs_instance:
name: "{{ inventory_hostname_short }}"
template: Linux Debian 7 64-bit 20GB Disk
service_offering: "{{ cs_offering }}"
security_groups: "{{ cs_securitygroups }}"
ssh_key: defaultkey
state: Running
register: vm
- name: show VM IP
debug: msg="VM {{ inventory_hostname }} {{ vm.default_ip }}"
- name: assing IP to the inventory
set_fact: ansible_ssh_host={{ vm.default_ip }}
- name: waiting for SSH to come up
wait_for: port=22 host={{ vm.default_ip }} delay=5
In the first play we setup the security groups, in the second play the VMs will created be assigned to these groups. Further you see, that we assign the public IP returned from the modules to the host inventory. This is needed as we do not know the IPs we will get in advance. In a next step you would configure the DNS servers with these IPs for accassing the VMs with their DNS name.
In the last task we wait for SSH to be accessible, so any later play would be able to access the VM by SSH without failure.

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Getting Started with Docker
===========================
Ansible offers the following modules for orchestrating Docker containers:
docker_service
Use your existing Docker compose files to orchestrate containers on a single Docker daemon or on
Swarm. Supports compose versions 1 and 2.
docker_container
Manages the container lifecycle by providing the ability to create, update, stop, start and destroy a
container.
docker_image
Provides full control over images, including: build, pull, push, tag and remove.
docker_image_facts
Inspects one or more images in the Docker host's image cache, providing the information as facts for making
decision or assertions in a playbook.
docker_login
Authenticates with Docker Hub or any Docker registry and updates the Docker Engine config file, which
in turn provides password-free pushing and pulling of images to and from the registry.
docker (dynamic inventory)
Dynamically builds an inventory of all the available containers from a set of one or more Docker hosts.
Ansible 2.1.0 includes major updates to the Docker modules, marking the start of a project to create a complete and
integrated set of tools for orchestrating containers. In addition to the above modules, we are also working on the
following:
Still using Dockerfile to build images? Check out `ansible-container <https://github.com/ansible/ansible-container>`_,
and start building images from your Ansible playbooks.
Use the *shipit* command in `ansible-container <https://github.com/ansible/ansible-container>`_
to launch your docker-compose file on `OpenShift <https://www.openshift.org/>`_. Go from an app on your laptop to a fully
scalable app in the cloud in just a few moments.
There's more planned. See the latest ideas and thinking at the `Ansible proposal repo <https://github.com/ansible/proposals/tree/master/docker>`_.
Requirements
------------
Using the docker modules requires having `docker-py <https://docker-py.readthedocs.org/en/stable/>`_
installed on the host running Ansible. You will need to have >= 1.7.0 installed.
.. code-block:: bash
$ pip install 'docker-py>=1.7.0'
The docker_service module also requires `docker-compose <https://github.com/docker/compose>`_
.. code-block:: bash
$ pip install 'docker-compose>=1.7.0'
Connecting to the Docker API
----------------------------
You can connect to a local or remote API using parameters passed to each task or by setting environment variables.
The order of precedence is command line parameters and then environment variables. If neither a command line
option or an environment variable is found, a default value will be used. The default values are provided under
`Parameters`_
Parameters
..........
Control how modules connect to the Docker API by passing the following parameters:
docker_host
The URL or Unix socket path used to connect to the Docker API. Defaults to ``unix://var/run/docker.sock``.
To connect to a remote host, provide the TCP connection string. For example: ``tcp://192.0.2.23:2376``. If
TLS is used to encrypt the connection to the API, then the module will automatically replace 'tcp' in the
connection URL with 'https'.
api_version
The version of the Docker API running on the Docker Host. Defaults to the latest version of the API supported
by docker-py.
timeout
The maximum amount of time in seconds to wait on a response from the API. Defaults to 60 seconds.
tls
Secure the connection to the API by using TLS without verifying the authenticity of the Docker host server.
Defaults to False.
tls_verify
Secure the connection to the API by using TLS and verifying the authenticity of the Docker host server.
Default is False.
cacert_path
Use a CA certificate when performing server verification by providing the path to a CA certificate file.
cert_path
Path to the client's TLS certificate file.
key_path
Path to the client's TLS key file.
tls_hostname
When verifying the authenticity of the Docker Host server, provide the expected name of the server. Defaults
to 'localhost'.
ssl_version
Provide a valid SSL version number. Default value determined by docker-py, which at the time of this writing
was 1.0
Environment Variables
.....................
Control how the modules connect to the Docker API by setting the following variables in the environment of the host
running Ansible:
DOCKER_HOST
The URL or Unix socket path used to connect to the Docker API.
DOCKER_API_VERSION
The version of the Docker API running on the Docker Host. Defaults to the latest version of the API supported
by docker-py.
DOCKER_TIMEOUT
The maximum amount of time in seconds to wait on a response from the API.
DOCKER_CERT_PATH
Path to the directory containing the client certificate, client key and CA certificate.
DOCKER_SSL_VERSION
Provide a valid SSL version number.
DOCKER_TLS
Secure the connection to the API by using TLS without verifying the authenticity of the Docker Host.
DOCKER_TLS_VERIFY
Secure the connection to the API by using TLS and verify the authenticity of the Docker Host.
Dynamic Inventory Script
------------------------
The inventory script generates dynamic inventory by making API requests to one or more Docker APIs. It's dynamic
because the inventory is generated at run-time rather than being read from a static file. The script generates the
inventory by connecting to one or many Docker APIs and inspecting the containers it finds at each API. Which APIs the
script contacts can be defined using environment variables or a configuration file.
Groups
......
The script will create the following host groups:
- container id
- container name
- container short id
- image_name (image_<image name>)
- docker_host
- running
- stopped
Examples
........
You can run the script interactively from the command line or pass it as the inventory to a playbook. Here are few
examples to get you started:
.. code-block:: bash
# Connect to the Docker API on localhost port 4243 and format the JSON output
DOCKER_HOST=tcp://localhost:4243 ./docker.py --pretty
# Any container's ssh port exposed on 0.0.0.0 will be mapped to
# another IP address (where Ansible will attempt to connect via SSH)
DOCKER_DEFAULT_IP=192.0.2.5 ./docker.py --pretty
# Run as input to a playbook:
ansible-playbook -i ~/projects/ansible/contrib/inventory/docker.py docker_inventory_test.yml
# Simple playbook to invoke with the above example:
- name: Test docker_inventory
hosts: all
connection: local
gather_facts: no
tasks:
- debug: msg="Container - {{ inventory_hostname }}"
Configuration
.............
You can control the behavior of the inventory script by defining environment variables, or
creating a docker.yml file (sample provided in ansible/contrib/inventory). The order of precedence is the docker.yml
file and then environment variables.
Environment Variables
;;;;;;;;;;;;;;;;;;;;;;
To connect to a single Docker API the following variables can be defined in the environment to control the connection
options. These are the same environment variables used by the Docker modules.
DOCKER_HOST
The URL or Unix socket path used to connect to the Docker API. Defaults to unix://var/run/docker.sock.
DOCKER_API_VERSION:
The version of the Docker API running on the Docker Host. Defaults to the latest version of the API supported
by docker-py.
DOCKER_TIMEOUT:
The maximum amount of time in seconds to wait on a response fromm the API. Defaults to 60 seconds.
DOCKER_TLS:
Secure the connection to the API by using TLS without verifying the authenticity of the Docker host server.
Defaults to False.
DOCKER_TLS_VERIFY:
Secure the connection to the API by using TLS and verifying the authenticity of the Docker host server.
Default is False
DOCKER_TLS_HOSTNAME:
When verifying the authenticity of the Docker Host server, provide the expected name of the server. Defaults
to localhost.
DOCKER_CERT_PATH:
Path to the directory containing the client certificate, client key and CA certificate.
DOCKER_SSL_VERSION:
Provide a valid SSL version number. Default value determined by docker-py, which at the time of this writing
was 1.0
In addition to the connection variables there are a couple variables used to control the execution and output of the
script:
DOCKER_CONFIG_FILE
Path to the configuration file. Defaults to ./docker.yml.
DOCKER_PRIVATE_SSH_PORT:
The private port (container port) on which SSH is listening for connections. Defaults to 22.
DOCKER_DEFAULT_IP:
The IP address to assign to ansible_host when the container's SSH port is mapped to interface '0.0.0.0'.
Configuration File
;;;;;;;;;;;;;;;;;;
Using a configuration file provides a means for defining a set of Docker APIs from which to build an inventory.
The default name of the file is derived from the name of the inventory script. By default the script will look for
basename of the script (i.e. docker) with an extension of '.yml'.
You can also override the default name of the script by defining DOCKER_CONFIG_FILE in the environment.
Here's what you can define in docker_inventory.yml:
defaults
Defines a default connection. Defaults will be taken from this and applied to any values not provided
for a host defined in the hosts list.
hosts
If you wish to get inventory from more than one Docker host, define a hosts list.
For the default host and each host in the hosts list define the following attributes:
.. code-block:: yaml
host:
description: The URL or Unix socket path used to connect to the Docker API.
required: yes
tls:
description: Connect using TLS without verifying the authenticity of the Docker host server.
default: false
required: false
tls_verify:
description: Connect using TLS without verifying the authenticity of the Docker host server.
default: false
required: false
cert_path:
description: Path to the client's TLS certificate file.
default: null
required: false
cacert_path:
description: Use a CA certificate when performing server verification by providing the path to a CA certificate file.
default: null
required: false
key_path:
description: Path to the client's TLS key file.
default: null
required: false
version:
description: The Docker API version.
required: false
default: will be supplied by the docker-py module.
timeout:
description: The amount of time in seconds to wait on an API response.
required: false
default: 60
default_ip:
description: The IP address to assign to ansible_host when the container's SSH port is mapped to interface
'0.0.0.0'.
required: false
default: 127.0.0.1
private_ssh_port:
description: The port containers use for SSH
required: false
default: 22

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Google Cloud Platform Guide
===========================
.. gce_intro:
Introduction
------------
.. note:: This section of the documentation is under construction. We are in the process of adding more examples about all of the GCE modules and how they work together. Upgrades via github pull requests are welcomed!
Ansible contains modules for managing Google Compute Engine resources, including creating instances, controlling network access, working with persistent disks, and managing
load balancers. Additionally, there is an inventory plugin that can automatically suck down all of your GCE instances into Ansible dynamic inventory, and create groups by tag and other properties.
The GCE modules all require the apache-libcloud module which you can install from pip:
.. code-block:: bash
$ pip install apache-libcloud
.. note:: If you're using Ansible on Mac OS X, libcloud also needs to access a CA cert chain. You'll need to download one (you can get one for `here <http://curl.haxx.se/docs/caextract.html>`_.)
Credentials
-----------
To work with the GCE modules, you'll first need to get some credentials in the
JSON format:
1. `Create a Service Account <https://developers.google.com/identity/protocols/OAuth2ServiceAccount#creatinganaccount>`_
2. `Download JSON credentials <https://support.google.com/cloud/answer/6158849?hl=en&ref_topic=6262490#serviceaccounts>`_
There are three different ways to provide credentials to Ansible so that it can talk with Google Cloud for provisioning and configuration actions:
.. note:: If you would like to use JSON credentials you must have libcloud >= 0.17.0
* by providing to the modules directly
* by populating a ``secrets.py`` file
* by setting environment variables
Calling Modules By Passing Credentials
``````````````````````````````````````
For the GCE modules you can specify the credentials as arguments:
* ``service_account_email``: email associated with the project
* ``credentials_file``: path to the JSON credentials file
* ``project_id``: id of the project
For example, to create a new instance using the cloud module, you can use the following configuration:
.. code-block:: yaml
- name: Create instance(s)
hosts: localhost
connection: local
gather_facts: no
vars:
service_account_email: unique-id@developer.gserviceaccount.com
credentials_file: /path/to/project.json
project_id: project-id
machine_type: n1-standard-1
image: debian-7
tasks:
- name: Launch instances
gce:
instance_names: dev
machine_type: "{{ machine_type }}"
image: "{{ image }}"
service_account_email: "{{ service_account_email }}"
credentials_file: "{{ credentials_file }}"
project_id: "{{ project_id }}"
When running Ansible inside a GCE VM you can use the service account credentials from the local metadata server by
setting both ``service_account_email`` and ``credentials_file`` to a blank string.
Configuring Modules with secrets.py
```````````````````````````````````
Create a file ``secrets.py`` looking like following, and put it in some folder which is in your ``$PYTHONPATH``:
.. code-block:: python
GCE_PARAMS = ('i...@project.googleusercontent.com', '/path/to/project.json')
GCE_KEYWORD_PARAMS = {'project': 'project_id'}
Ensure to enter the email address from the created services account and not the one from your main account.
Now the modules can be used as above, but the account information can be omitted.
If you are running Ansible from inside a GCE VM with an authorized service account you can set the email address and
credentials path as follows so that get automatically picked up:
.. code-block:: python
GCE_PARAMS = ('', '')
GCE_KEYWORD_PARAMS = {'project': 'project_id'}
Configuring Modules with Environment Variables
``````````````````````````````````````````````
Set the following environment variables before running Ansible in order to configure your credentials:
.. code-block:: bash
GCE_EMAIL
GCE_PROJECT
GCE_CREDENTIALS_FILE_PATH
GCE Dynamic Inventory
---------------------
The best way to interact with your hosts is to use the gce inventory plugin, which dynamically queries GCE and tells Ansible what nodes can be managed.
Note that when using the inventory script ``gce.py``, you also need to populate the ``gce.ini`` file that you can find in the contrib/inventory directory of the ansible checkout.
To use the GCE dynamic inventory script, copy ``gce.py`` from ``contrib/inventory`` into your inventory directory and make it executable. You can specify credentials for ``gce.py`` using the ``GCE_INI_PATH`` environment variable -- the default is to look for gce.ini in the same directory as the inventory script.
Let's see if inventory is working:
.. code-block:: bash
$ ./gce.py --list
You should see output describing the hosts you have, if any, running in Google Compute Engine.
Now let's see if we can use the inventory script to talk to Google.
.. code-block:: bash
$ GCE_INI_PATH=~/.gce.ini ansible all -i gce.py -m setup
hostname | success >> {
"ansible_facts": {
"ansible_all_ipv4_addresses": [
"x.x.x.x"
],
As with all dynamic inventory scripts in Ansible, you can configure the inventory path in ansible.cfg. The recommended way to use the inventory is to create an ``inventory`` directory, and place both the ``gce.py`` script and a file containing ``localhost`` in it. This can allow for cloud inventory to be used alongside local inventory (such as a physical datacenter) or machines running in different providers.
Executing ``ansible`` or ``ansible-playbook`` and specifying the ``inventory`` directory instead of an individual file will cause ansible to evaluate each file in that directory for inventory.
Let's once again use our inventory script to see if it can talk to Google Cloud:
.. code-block:: bash
$ ansible all -i inventory/ -m setup
hostname | success >> {
"ansible_facts": {
"ansible_all_ipv4_addresses": [
"x.x.x.x"
],
The output should be similar to the previous command. If you're wanting less output and just want to check for SSH connectivity, use "-m" ping instead.
Use Cases
---------
For the following use case, let's use this small shell script as a wrapper.
.. code-block:: bash
#!/usr/bin/env bash
PLAYBOOK="$1"
if [[ -z $PLAYBOOK ]]; then
echo "You need to pass a playbook as argument to this script."
exit 1
fi
export SSL_CERT_FILE=$(pwd)/cacert.cer
export ANSIBLE_HOST_KEY_CHECKING=False
if [[ ! -f "$SSL_CERT_FILE" ]]; then
curl -O http://curl.haxx.se/ca/cacert.pem
fi
ansible-playbook -v -i inventory/ "$PLAYBOOK"
Create an instance
``````````````````
The GCE module provides the ability to provision instances within Google Compute Engine. The provisioning task is typically performed from your Ansible control server against Google Cloud's API.
A playbook would looks like this:
.. code-block:: yaml
- name: Create instance(s)
hosts: localhost
gather_facts: no
connection: local
vars:
machine_type: n1-standard-1 # default
image: debian-7
service_account_email: unique-id@developer.gserviceaccount.com
credentials_file: /path/to/project.json
project_id: project-id
tasks:
- name: Launch instances
gce:
instance_names: dev
machine_type: "{{ machine_type }}"
image: "{{ image }}"
service_account_email: "{{ service_account_email }}"
credentials_file: "{{ credentials_file }}"
project_id: "{{ project_id }}"
tags: webserver
register: gce
- name: Wait for SSH to come up
wait_for: host={{ item.public_ip }} port=22 delay=10 timeout=60
with_items: "{{ gce.instance_data }}"
- name: Add host to groupname
add_host: hostname={{ item.public_ip }} groupname=new_instances
with_items: "{{ gce.instance_data }}"
- name: Manage new instances
hosts: new_instances
connection: ssh
sudo: True
roles:
- base_configuration
- production_server
Note that use of the "add_host" module above creates a temporary, in-memory group. This means that a play in the same playbook can then manage machines
in the 'new_instances' group, if so desired. Any sort of arbitrary configuration is possible at this point.
Configuring instances in a group
````````````````````````````````
All of the created instances in GCE are grouped by tag. Since this is a cloud, it's probably best to ignore hostnames and just focus on group management.
Normally we'd also use roles here, but the following example is a simple one. Here we will also use the "gce_net" module to open up access to port 80 on
these nodes.
The variables in the 'vars' section could also be kept in a 'vars_files' file or something encrypted with Ansible-vault, if you so choose. This is just
a basic example of what is possible::
- name: Setup web servers
hosts: tag_webserver
gather_facts: no
vars:
machine_type: n1-standard-1 # default
image: debian-7
service_account_email: unique-id@developer.gserviceaccount.com
credentials_file: /path/to/project.json
project_id: project-id
roles:
- name: Install lighttpd
apt: pkg=lighttpd state=installed
sudo: True
- name: Allow HTTP
local_action: gce_net
args:
fwname: "all-http"
name: "default"
allowed: "tcp:80"
state: "present"
service_account_email: "{{ service_account_email }}"
credentials_file: "{{ credentials_file }}"
project_id: "{{ project_id }}"
By pointing your browser to the IP of the server, you should see a page welcoming you.
Upgrades to this documentation are welcome, hit the github link at the top right of this page if you would like to make additions!

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@ -0,0 +1,822 @@
Rackspace Cloud Guide
=====================
.. _rax_introduction:
Introduction
````````````
.. note:: This section of the documentation is under construction. We are in the process of adding more examples about the Rackspace modules and how they work together. Once complete, there will also be examples for Rackspace Cloud in `ansible-examples <https://github.com/ansible/ansible-examples/>`_.
Ansible contains a number of core modules for interacting with Rackspace Cloud.
The purpose of this section is to explain how to put Ansible modules together
(and use inventory scripts) to use Ansible in a Rackspace Cloud context.
Prerequisites for using the rax modules are minimal. In addition to ansible itself,
all of the modules require and are tested against pyrax 1.5 or higher.
You'll need this Python module installed on the execution host.
pyrax is not currently available in many operating system
package repositories, so you will likely need to install it via pip:
.. code-block:: bash
$ pip install pyrax
The following steps will often execute from the control machine against the Rackspace Cloud API, so it makes sense
to add localhost to the inventory file. (Ansible may not require this manual step in the future):
.. code-block:: ini
[localhost]
localhost ansible_connection=local
In playbook steps, we'll typically be using the following pattern:
.. code-block:: yaml
- hosts: localhost
connection: local
gather_facts: False
tasks:
.. _credentials_file:
Credentials File
````````````````
The `rax.py` inventory script and all `rax` modules support a standard `pyrax` credentials file that looks like:
.. code-block:: ini
[rackspace_cloud]
username = myraxusername
api_key = d41d8cd98f00b204e9800998ecf8427e
Setting the environment parameter RAX_CREDS_FILE to the path of this file will help Ansible find how to load
this information.
More information about this credentials file can be found at
https://github.com/rackspace/pyrax/blob/master/docs/getting_started.md#authenticating
.. _virtual_environment:
Running from a Python Virtual Environment (Optional)
++++++++++++++++++++++++++++++++++++++++++++++++++++
Most users will not be using virtualenv, but some users, particularly Python developers sometimes like to.
There are special considerations when Ansible is installed to a Python virtualenv, rather than the default of installing at a global scope. Ansible assumes, unless otherwise instructed, that the python binary will live at /usr/bin/python. This is done via the interpreter line in modules, however when instructed by setting the inventory variable 'ansible_python_interpreter', Ansible will use this specified path instead to find Python. This can be a cause of confusion as one may assume that modules running on 'localhost', or perhaps running via 'local_action', are using the virtualenv Python interpreter. By setting this line in the inventory, the modules will execute in the virtualenv interpreter and have available the virtualenv packages, specifically pyrax. If using virtualenv, you may wish to modify your localhost inventory definition to find this location as follows:
.. code-block:: ini
[localhost]
localhost ansible_connection=local ansible_python_interpreter=/path/to/ansible_venv/bin/python
.. note::
pyrax may be installed in the global Python package scope or in a virtual environment. There are no special considerations to keep in mind when installing pyrax.
.. _provisioning:
Provisioning
````````````
Now for the fun parts.
The 'rax' module provides the ability to provision instances within Rackspace Cloud. Typically the provisioning task will be performed from your Ansible control server (in our example, localhost) against the Rackspace cloud API. This is done for several reasons:
- Avoiding installing the pyrax library on remote nodes
- No need to encrypt and distribute credentials to remote nodes
- Speed and simplicity
.. note::
Authentication with the Rackspace-related modules is handled by either
specifying your username and API key as environment variables or passing
them as module arguments, or by specifying the location of a credentials
file.
Here is a basic example of provisioning an instance in ad-hoc mode:
.. code-block:: bash
$ ansible localhost -m rax -a "name=awx flavor=4 image=ubuntu-1204-lts-precise-pangolin wait=yes" -c local
Here's what it would look like in a playbook, assuming the parameters were defined in variables:
.. code-block:: yaml
tasks:
- name: Provision a set of instances
local_action:
module: rax
name: "{{ rax_name }}"
flavor: "{{ rax_flavor }}"
image: "{{ rax_image }}"
count: "{{ rax_count }}"
group: "{{ group }}"
wait: yes
register: rax
The rax module returns data about the nodes it creates, like IP addresses, hostnames, and login passwords. By registering the return value of the step, it is possible used this data to dynamically add the resulting hosts to inventory (temporarily, in memory). This facilitates performing configuration actions on the hosts in a follow-on task. In the following example, the servers that were successfully created using the above task are dynamically added to a group called "raxhosts", with each nodes hostname, IP address, and root password being added to the inventory.
.. include:: ../rst_common/ansible_ssh_changes_note.rst
.. code-block:: yaml
- name: Add the instances we created (by public IP) to the group 'raxhosts'
local_action:
module: add_host
hostname: "{{ item.name }}"
ansible_host: "{{ item.rax_accessipv4 }}"
ansible_ssh_pass: "{{ item.rax_adminpass }}"
groups: raxhosts
with_items: "{{ rax.success }}"
when: rax.action == 'create'
With the host group now created, the next play in this playbook could now configure servers belonging to the raxhosts group.
.. code-block:: yaml
- name: Configuration play
hosts: raxhosts
user: root
roles:
- ntp
- webserver
The method above ties the configuration of a host with the provisioning step. This isn't always what you want, and leads us
to the next section.
.. _host_inventory:
Host Inventory
``````````````
Once your nodes are spun up, you'll probably want to talk to them again. The best way to handle this is to use the "rax" inventory plugin, which dynamically queries Rackspace Cloud and tells Ansible what nodes you have to manage. You might want to use this even if you are spinning up cloud instances via other tools, including the Rackspace Cloud user interface. The inventory plugin can be used to group resources by metadata, region, OS, etc. Utilizing metadata is highly recommended in "rax" and can provide an easy way to sort between host groups and roles. If you don't want to use the ``rax.py`` dynamic inventory script, you could also still choose to manually manage your INI inventory file, though this is less recommended.
In Ansible it is quite possible to use multiple dynamic inventory plugins along with INI file data. Just put them in a common directory and be sure the scripts are chmod +x, and the INI-based ones are not.
.. _raxpy:
rax.py
++++++
To use the rackspace dynamic inventory script, copy ``rax.py`` into your inventory directory and make it executable. You can specify a credentials file for ``rax.py`` utilizing the ``RAX_CREDS_FILE`` environment variable.
.. note:: Dynamic inventory scripts (like ``rax.py``) are saved in ``/usr/share/ansible/inventory`` if Ansible has been installed globally. If installed to a virtualenv, the inventory scripts are installed to ``$VIRTUALENV/share/inventory``.
.. note:: Users of :doc:`tower` will note that dynamic inventory is natively supported by Tower, and all you have to do is associate a group with your Rackspace Cloud credentials, and it will easily synchronize without going through these steps::
$ RAX_CREDS_FILE=~/.raxpub ansible all -i rax.py -m setup
``rax.py`` also accepts a ``RAX_REGION`` environment variable, which can contain an individual region, or a comma separated list of regions.
When using ``rax.py``, you will not have a 'localhost' defined in the inventory.
As mentioned previously, you will often be running most of these modules outside of the host loop, and will need 'localhost' defined. The recommended way to do this, would be to create an ``inventory`` directory, and place both the ``rax.py`` script and a file containing ``localhost`` in it.
Executing ``ansible`` or ``ansible-playbook`` and specifying the ``inventory`` directory instead
of an individual file, will cause ansible to evaluate each file in that directory for inventory.
Let's test our inventory script to see if it can talk to Rackspace Cloud.
.. code-block:: bash
$ RAX_CREDS_FILE=~/.raxpub ansible all -i inventory/ -m setup
Assuming things are properly configured, the ``rax.py`` inventory script will output information similar to the
following information, which will be utilized for inventory and variables.
.. code-block:: json
{
"ORD": [
"test"
],
"_meta": {
"hostvars": {
"test": {
"ansible_host": "198.51.100.1",
"rax_accessipv4": "198.51.100.1",
"rax_accessipv6": "2001:DB8::2342",
"rax_addresses": {
"private": [
{
"addr": "192.0.2.2",
"version": 4
}
],
"public": [
{
"addr": "198.51.100.1",
"version": 4
},
{
"addr": "2001:DB8::2342",
"version": 6
}
]
},
"rax_config_drive": "",
"rax_created": "2013-11-14T20:48:22Z",
"rax_flavor": {
"id": "performance1-1",
"links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/flavors/performance1-1",
"rel": "bookmark"
}
]
},
"rax_hostid": "e7b6961a9bd943ee82b13816426f1563bfda6846aad84d52af45a4904660cde0",
"rax_human_id": "test",
"rax_id": "099a447b-a644-471f-87b9-a7f580eb0c2a",
"rax_image": {
"id": "b211c7bf-b5b4-4ede-a8de-a4368750c653",
"links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/images/b211c7bf-b5b4-4ede-a8de-a4368750c653",
"rel": "bookmark"
}
]
},
"rax_key_name": null,
"rax_links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/v2/111111/servers/099a447b-a644-471f-87b9-a7f580eb0c2a",
"rel": "self"
},
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/servers/099a447b-a644-471f-87b9-a7f580eb0c2a",
"rel": "bookmark"
}
],
"rax_metadata": {
"foo": "bar"
},
"rax_name": "test",
"rax_name_attr": "name",
"rax_networks": {
"private": [
"192.0.2.2"
],
"public": [
"198.51.100.1",
"2001:DB8::2342"
]
},
"rax_os-dcf_diskconfig": "AUTO",
"rax_os-ext-sts_power_state": 1,
"rax_os-ext-sts_task_state": null,
"rax_os-ext-sts_vm_state": "active",
"rax_progress": 100,
"rax_status": "ACTIVE",
"rax_tenant_id": "111111",
"rax_updated": "2013-11-14T20:49:27Z",
"rax_user_id": "22222"
}
}
}
}
.. _standard_inventory:
Standard Inventory
++++++++++++++++++
When utilizing a standard ini formatted inventory file (as opposed to the inventory plugin), it may still be advantageous to retrieve discoverable hostvar information from the Rackspace API.
This can be achieved with the ``rax_facts`` module and an inventory file similar to the following:
.. code-block:: ini
[test_servers]
hostname1 rax_region=ORD
hostname2 rax_region=ORD
.. code-block:: yaml
- name: Gather info about servers
hosts: test_servers
gather_facts: False
tasks:
- name: Get facts about servers
local_action:
module: rax_facts
credentials: ~/.raxpub
name: "{{ inventory_hostname }}"
region: "{{ rax_region }}"
- name: Map some facts
set_fact:
ansible_host: "{{ rax_accessipv4 }}"
While you don't need to know how it works, it may be interesting to know what kind of variables are returned.
The ``rax_facts`` module provides facts as followings, which match the ``rax.py`` inventory script:
.. code-block:: json
{
"ansible_facts": {
"rax_accessipv4": "198.51.100.1",
"rax_accessipv6": "2001:DB8::2342",
"rax_addresses": {
"private": [
{
"addr": "192.0.2.2",
"version": 4
}
],
"public": [
{
"addr": "198.51.100.1",
"version": 4
},
{
"addr": "2001:DB8::2342",
"version": 6
}
]
},
"rax_config_drive": "",
"rax_created": "2013-11-14T20:48:22Z",
"rax_flavor": {
"id": "performance1-1",
"links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/flavors/performance1-1",
"rel": "bookmark"
}
]
},
"rax_hostid": "e7b6961a9bd943ee82b13816426f1563bfda6846aad84d52af45a4904660cde0",
"rax_human_id": "test",
"rax_id": "099a447b-a644-471f-87b9-a7f580eb0c2a",
"rax_image": {
"id": "b211c7bf-b5b4-4ede-a8de-a4368750c653",
"links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/images/b211c7bf-b5b4-4ede-a8de-a4368750c653",
"rel": "bookmark"
}
]
},
"rax_key_name": null,
"rax_links": [
{
"href": "https://ord.servers.api.rackspacecloud.com/v2/111111/servers/099a447b-a644-471f-87b9-a7f580eb0c2a",
"rel": "self"
},
{
"href": "https://ord.servers.api.rackspacecloud.com/111111/servers/099a447b-a644-471f-87b9-a7f580eb0c2a",
"rel": "bookmark"
}
],
"rax_metadata": {
"foo": "bar"
},
"rax_name": "test",
"rax_name_attr": "name",
"rax_networks": {
"private": [
"192.0.2.2"
],
"public": [
"198.51.100.1",
"2001:DB8::2342"
]
},
"rax_os-dcf_diskconfig": "AUTO",
"rax_os-ext-sts_power_state": 1,
"rax_os-ext-sts_task_state": null,
"rax_os-ext-sts_vm_state": "active",
"rax_progress": 100,
"rax_status": "ACTIVE",
"rax_tenant_id": "111111",
"rax_updated": "2013-11-14T20:49:27Z",
"rax_user_id": "22222"
},
"changed": false
}
Use Cases
`````````
This section covers some additional usage examples built around a specific use case.
.. _network_and_server:
Network and Server
++++++++++++++++++
Create an isolated cloud network and build a server
.. code-block:: yaml
- name: Build Servers on an Isolated Network
hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Network create request
local_action:
module: rax_network
credentials: ~/.raxpub
label: my-net
cidr: 192.168.3.0/24
region: IAD
state: present
- name: Server create request
local_action:
module: rax
credentials: ~/.raxpub
name: web%04d.example.org
flavor: 2
image: ubuntu-1204-lts-precise-pangolin
disk_config: manual
networks:
- public
- my-net
region: IAD
state: present
count: 5
exact_count: yes
group: web
wait: yes
wait_timeout: 360
register: rax
.. _complete_environment:
Complete Environment
++++++++++++++++++++
Build a complete webserver environment with servers, custom networks and load balancers, install nginx and create a custom index.html
.. code-block:: yaml
---
- name: Build environment
hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Load Balancer create request
local_action:
module: rax_clb
credentials: ~/.raxpub
name: my-lb
port: 80
protocol: HTTP
algorithm: ROUND_ROBIN
type: PUBLIC
timeout: 30
region: IAD
wait: yes
state: present
meta:
app: my-cool-app
register: clb
- name: Network create request
local_action:
module: rax_network
credentials: ~/.raxpub
label: my-net
cidr: 192.168.3.0/24
state: present
region: IAD
register: network
- name: Server create request
local_action:
module: rax
credentials: ~/.raxpub
name: web%04d.example.org
flavor: performance1-1
image: ubuntu-1204-lts-precise-pangolin
disk_config: manual
networks:
- public
- private
- my-net
region: IAD
state: present
count: 5
exact_count: yes
group: web
wait: yes
register: rax
- name: Add servers to web host group
local_action:
module: add_host
hostname: "{{ item.name }}"
ansible_host: "{{ item.rax_accessipv4 }}"
ansible_ssh_pass: "{{ item.rax_adminpass }}"
ansible_user: root
groups: web
with_items: "{{ rax.success }}"
when: rax.action == 'create'
- name: Add servers to Load balancer
local_action:
module: rax_clb_nodes
credentials: ~/.raxpub
load_balancer_id: "{{ clb.balancer.id }}"
address: "{{ item.rax_networks.private|first }}"
port: 80
condition: enabled
type: primary
wait: yes
region: IAD
with_items: "{{ rax.success }}"
when: rax.action == 'create'
- name: Configure servers
hosts: web
handlers:
- name: restart nginx
service: name=nginx state=restarted
tasks:
- name: Install nginx
apt: pkg=nginx state=latest update_cache=yes cache_valid_time=86400
notify:
- restart nginx
- name: Ensure nginx starts on boot
service: name=nginx state=started enabled=yes
- name: Create custom index.html
copy: content="{{ inventory_hostname }}" dest=/usr/share/nginx/www/index.html
owner=root group=root mode=0644
.. _rackconnect_and_manged_cloud:
RackConnect and Managed Cloud
+++++++++++++++++++++++++++++
When using RackConnect version 2 or Rackspace Managed Cloud there are Rackspace automation tasks that are executed on the servers you create after they are successfully built. If your automation executes before the RackConnect or Managed Cloud automation, you can cause failures and un-usable servers.
These examples show creating servers, and ensuring that the Rackspace automation has completed before Ansible continues onwards.
For simplicity, these examples are joined, however both are only needed when using RackConnect. When only using Managed Cloud, the RackConnect portion can be ignored.
The RackConnect portions only apply to RackConnect version 2.
.. _using_a_control_machine:
Using a Control Machine
***********************
.. code-block:: yaml
- name: Create an exact count of servers
hosts: localhost
connection: local
gather_facts: False
tasks:
- name: Server build requests
local_action:
module: rax
credentials: ~/.raxpub
name: web%03d.example.org
flavor: performance1-1
image: ubuntu-1204-lts-precise-pangolin
disk_config: manual
region: DFW
state: present
count: 1
exact_count: yes
group: web
wait: yes
register: rax
- name: Add servers to in memory groups
local_action:
module: add_host
hostname: "{{ item.name }}"
ansible_host: "{{ item.rax_accessipv4 }}"
ansible_ssh_pass: "{{ item.rax_adminpass }}"
ansible_user: root
rax_id: "{{ item.rax_id }}"
groups: web,new_web
with_items: "{{ rax.success }}"
when: rax.action == 'create'
- name: Wait for rackconnect and managed cloud automation to complete
hosts: new_web
gather_facts: false
tasks:
- name: Wait for rackconnnect automation to complete
local_action:
module: rax_facts
credentials: ~/.raxpub
id: "{{ rax_id }}"
region: DFW
register: rax_facts
until: rax_facts.ansible_facts['rax_metadata']['rackconnect_automation_status']|default('') == 'DEPLOYED'
retries: 30
delay: 10
- name: Wait for managed cloud automation to complete
local_action:
module: rax_facts
credentials: ~/.raxpub
id: "{{ rax_id }}"
region: DFW
register: rax_facts
until: rax_facts.ansible_facts['rax_metadata']['rax_service_level_automation']|default('') == 'Complete'
retries: 30
delay: 10
- name: Update new_web hosts with IP that RackConnect assigns
hosts: new_web
gather_facts: false
tasks:
- name: Get facts about servers
local_action:
module: rax_facts
name: "{{ inventory_hostname }}"
region: DFW
- name: Map some facts
set_fact:
ansible_host: "{{ rax_accessipv4 }}"
- name: Base Configure Servers
hosts: web
roles:
- role: users
- role: openssh
opensshd_PermitRootLogin: "no"
- role: ntp
.. _using_ansible_pull:
Using Ansible Pull
******************
.. code-block:: yaml
---
- name: Ensure Rackconnect and Managed Cloud Automation is complete
hosts: all
connection: local
tasks:
- name: Check for completed bootstrap
stat:
path: /etc/bootstrap_complete
register: bootstrap
- name: Get region
command: xenstore-read vm-data/provider_data/region
register: rax_region
when: bootstrap.stat.exists != True
- name: Wait for rackconnect automation to complete
uri:
url: "https://{{ rax_region.stdout|trim }}.api.rackconnect.rackspace.com/v1/automation_status?format=json"
return_content: yes
register: automation_status
when: bootstrap.stat.exists != True
until: automation_status['automation_status']|default('') == 'DEPLOYED'
retries: 30
delay: 10
- name: Wait for managed cloud automation to complete
wait_for:
path: /tmp/rs_managed_cloud_automation_complete
delay: 10
when: bootstrap.stat.exists != True
- name: Set bootstrap completed
file:
path: /etc/bootstrap_complete
state: touch
owner: root
group: root
mode: 0400
- name: Base Configure Servers
hosts: all
connection: local
roles:
- role: users
- role: openssh
opensshd_PermitRootLogin: "no"
- role: ntp
.. _using_ansible_pull_with_xenstore:
Using Ansible Pull with XenStore
********************************
.. code-block:: yaml
---
- name: Ensure Rackconnect and Managed Cloud Automation is complete
hosts: all
connection: local
tasks:
- name: Check for completed bootstrap
stat:
path: /etc/bootstrap_complete
register: bootstrap
- name: Wait for rackconnect_automation_status xenstore key to exist
command: xenstore-exists vm-data/user-metadata/rackconnect_automation_status
register: rcas_exists
when: bootstrap.stat.exists != True
failed_when: rcas_exists.rc|int > 1
until: rcas_exists.rc|int == 0
retries: 30
delay: 10
- name: Wait for rackconnect automation to complete
command: xenstore-read vm-data/user-metadata/rackconnect_automation_status
register: rcas
when: bootstrap.stat.exists != True
until: rcas.stdout|replace('"', '') == 'DEPLOYED'
retries: 30
delay: 10
- name: Wait for rax_service_level_automation xenstore key to exist
command: xenstore-exists vm-data/user-metadata/rax_service_level_automation
register: rsla_exists
when: bootstrap.stat.exists != True
failed_when: rsla_exists.rc|int > 1
until: rsla_exists.rc|int == 0
retries: 30
delay: 10
- name: Wait for managed cloud automation to complete
command: xenstore-read vm-data/user-metadata/rackconnect_automation_status
register: rsla
when: bootstrap.stat.exists != True
until: rsla.stdout|replace('"', '') == 'DEPLOYED'
retries: 30
delay: 10
- name: Set bootstrap completed
file:
path: /etc/bootstrap_complete
state: touch
owner: root
group: root
mode: 0400
- name: Base Configure Servers
hosts: all
connection: local
roles:
- role: users
- role: openssh
opensshd_PermitRootLogin: "no"
- role: ntp
.. _advanced_usage:
Advanced Usage
``````````````
.. _awx_autoscale:
Autoscaling with Tower
++++++++++++++++++++++
:doc:`tower` also contains a very nice feature for auto-scaling use cases.
In this mode, a simple curl script can call a defined URL and the server will "dial out" to the requester
and configure an instance that is spinning up. This can be a great way to reconfigure ephemeral nodes.
See the Tower documentation for more details.
A benefit of using the callback in Tower over pull mode is that job results are still centrally recorded
and less information has to be shared with remote hosts.
.. _pending_information:
Orchestration in the Rackspace Cloud
++++++++++++++++++++++++++++++++++++
Ansible is a powerful orchestration tool, and rax modules allow you the opportunity to orchestrate complex tasks, deployments, and configurations. The key here is to automate provisioning of infrastructure, like any other piece of software in an environment. Complex deployments might have previously required manual manipulation of load balancers, or manual provisioning of servers. Utilizing the rax modules included with Ansible, one can make the deployment of additional nodes contingent on the current number of running nodes, or the configuration of a clustered application dependent on the number of nodes with common metadata. One could automate the following scenarios, for example:
* Servers that are removed from a Cloud Load Balancer one-by-one, updated, verified, and returned to the load balancer pool
* Expansion of an already-online environment, where nodes are provisioned, bootstrapped, configured, and software installed
* A procedure where app log files are uploaded to a central location, like Cloud Files, before a node is decommissioned
* Servers and load balancers that have DNS records created and destroyed on creation and decommissioning, respectively

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Continuous Delivery and Rolling Upgrades
========================================
.. _lamp_introduction:
Introduction
````````````
Continuous Delivery is the concept of frequently delivering updates to your software application.
The idea is that by updating more often, you do not have to wait for a specific timed period, and your organization
gets better at the process of responding to change.
Some Ansible users are deploying updates to their end users on an hourly or even more frequent basis -- sometimes every time
there is an approved code change. To achieve this, you need tools to be able to quickly apply those updates in a zero-downtime way.
This document describes in detail how to achieve this goal, using one of Ansible's most complete example
playbooks as a template: lamp_haproxy. This example uses a lot of Ansible features: roles, templates,
and group variables, and it also comes with an orchestration playbook that can do zero-downtime
rolling upgrades of the web application stack.
.. note::
`Click here for the latest playbooks for this example
<https://github.com/ansible/ansible-examples/tree/master/lamp_haproxy>`_.
The playbooks deploy Apache, PHP, MySQL, Nagios, and HAProxy to a CentOS-based set of servers.
We're not going to cover how to run these playbooks here. Read the included README in the github project along with the
example for that information. Instead, we're going to take a close look at every part of the playbook and describe what it does.
.. _lamp_deployment:
Site Deployment
```````````````
Let's start with ``site.yml``. This is our site-wide deployment playbook. It can be used to initially deploy the site, as well
as push updates to all of the servers::
---
# This playbook deploys the whole application stack in this site.
# Apply common configuration to all hosts
- hosts: all
roles:
- common
# Configure and deploy database servers.
- hosts: dbservers
roles:
- db
# Configure and deploy the web servers. Note that we include two roles
# here, the 'base-apache' role which simply sets up Apache, and 'web'
# which includes our example web application.
- hosts: webservers
roles:
- base-apache
- web
# Configure and deploy the load balancer(s).
- hosts: lbservers
roles:
- haproxy
# Configure and deploy the Nagios monitoring node(s).
- hosts: monitoring
roles:
- base-apache
- nagios
.. note::
If you're not familiar with terms like playbooks and plays, you should review :doc:`playbooks`.
In this playbook we have 5 plays. The first one targets ``all`` hosts and applies the ``common`` role to all of the hosts.
This is for site-wide things like yum repository configuration, firewall configuration, and anything else that needs to apply to all of the servers.
The next four plays run against specific host groups and apply specific roles to those servers.
Along with the roles for Nagios monitoring, the database, and the web application, we've implemented a
``base-apache`` role that installs and configures a basic Apache setup. This is used by both the
sample web application and the Nagios hosts.
.. _lamp_roles:
Reusable Content: Roles
```````````````````````
By now you should have a bit of understanding about roles and how they work in Ansible. Roles are a way to organize
content: tasks, handlers, templates, and files, into reusable components.
This example has six roles: ``common``, ``base-apache``, ``db``, ``haproxy``, ``nagios``, and ``web``. How you organize
your roles is up to you and your application, but most sites will have one or more common roles that are applied to
all systems, and then a series of application-specific roles that install and configure particular parts of the site.
Roles can have variables and dependencies, and you can pass in parameters to roles to modify their behavior.
You can read more about roles in the :doc:`playbooks_roles` section.
.. _lamp_group_variables:
Configuration: Group Variables
``````````````````````````````
Group variables are variables that are applied to groups of servers. They can be used in templates and in
playbooks to customize behavior and to provide easily-changed settings and parameters. They are stored in
a directory called ``group_vars`` in the same location as your inventory.
Here is lamp_haproxy's ``group_vars/all`` file. As you might expect, these variables are applied to all of the machines in your inventory::
---
httpd_port: 80
ntpserver: 192.0.2.23
This is a YAML file, and you can create lists and dictionaries for more complex variable structures.
In this case, we are just setting two variables, one for the port for the web server, and one for the
NTP server that our machines should use for time synchronization.
Here's another group variables file. This is ``group_vars/dbservers`` which applies to the hosts in the ``dbservers`` group::
---
mysqlservice: mysqld
mysql_port: 3306
dbuser: root
dbname: foodb
upassword: usersecret
If you look in the example, there are group variables for the ``webservers`` group and the ``lbservers`` group, similarly.
These variables are used in a variety of places. You can use them in playbooks, like this, in ``roles/db/tasks/main.yml``::
- name: Create Application Database
mysql_db: name={{ dbname }} state=present
- name: Create Application DB User
mysql_user: name={{ dbuser }} password={{ upassword }}
priv=*.*:ALL host='%' state=present
You can also use these variables in templates, like this, in ``roles/common/templates/ntp.conf.j2``::
driftfile /var/lib/ntp/drift
restrict 127.0.0.1
restrict -6 ::1
server {{ ntpserver }}
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
You can see that the variable substitution syntax of {{ and }} is the same for both templates and variables. The syntax
inside the curly braces is Jinja2, and you can do all sorts of operations and apply different filters to the
data inside. In templates, you can also use for loops and if statements to handle more complex situations,
like this, in ``roles/common/templates/iptables.j2``::
{% if inventory_hostname in groups['dbservers'] %}
-A INPUT -p tcp --dport 3306 -j ACCEPT
{% endif %}
This is testing to see if the inventory name of the machine we're currently operating on (``inventory_hostname``)
exists in the inventory group ``dbservers``. If so, that machine will get an iptables ACCEPT line for port 3306.
Here's another example, from the same template::
{% for host in groups['monitoring'] %}
-A INPUT -p tcp -s {{ hostvars[host].ansible_default_ipv4.address }} --dport 5666 -j ACCEPT
{% endfor %}
This loops over all of the hosts in the group called ``monitoring``, and adds an ACCEPT line for
each monitoring hosts' default IPV4 address to the current machine's iptables configuration, so that Nagios can monitor those hosts.
You can learn a lot more about Jinja2 and its capabilities `here <http://jinja.pocoo.org/docs/>`_, and you
can read more about Ansible variables in general in the :doc:`playbooks_variables` section.
.. _lamp_rolling_upgrade:
The Rolling Upgrade
```````````````````
Now you have a fully-deployed site with web servers, a load balancer, and monitoring. How do you update it? This is where Ansible's
orchestration features come into play. While some applications use the term 'orchestration' to mean basic ordering or command-blasting, Ansible
refers to orchestration as 'conducting machines like an orchestra', and has a pretty sophisticated engine for it.
Ansible has the capability to do operations on multi-tier applications in a coordinated way, making it easy to orchestrate a sophisticated zero-downtime rolling upgrade of our web application. This is implemented in a separate playbook, called ``rolling_update.yml``.
Looking at the playbook, you can see it is made up of two plays. The first play is very simple and looks like this::
- hosts: monitoring
tasks: []
What's going on here, and why are there no tasks? You might know that Ansible gathers "facts" from the servers before operating upon them. These facts are useful for all sorts of things: networking information, OS/distribution versions, etc. In our case, we need to know something about all of the monitoring servers in our environment before we perform the update, so this simple play forces a fact-gathering step on our monitoring servers. You will see this pattern sometimes, and it's a useful trick to know.
The next part is the update play. The first part looks like this::
- hosts: webservers
user: root
serial: 1
This is just a normal play definition, operating on the ``webservers`` group. The ``serial`` keyword tells Ansible how many servers to operate on at once. If it's not specified, Ansible will parallelize these operations up to the default "forks" limit specified in the configuration file. But for a zero-downtime rolling upgrade, you may not want to operate on that many hosts at once. If you had just a handful of webservers, you may want to set ``serial`` to 1, for one host at a time. If you have 100, maybe you could set ``serial`` to 10, for ten at a time.
Here is the next part of the update play::
pre_tasks:
- name: disable nagios alerts for this host webserver service
nagios: action=disable_alerts host={{ inventory_hostname }} services=webserver
delegate_to: "{{ item }}"
with_items: "{{ groups.monitoring }}"
- name: disable the server in haproxy
shell: echo "disable server myapplb/{{ inventory_hostname }}" | socat stdio /var/lib/haproxy/stats
delegate_to: "{{ item }}"
with_items: "{{ groups.lbservers }}"
The ``pre_tasks`` keyword just lets you list tasks to run before the roles are called. This will make more sense in a minute. If you look at the names of these tasks, you can see that we are disabling Nagios alerts and then removing the webserver that we are currently updating from the HAProxy load balancing pool.
The ``delegate_to`` and ``with_items`` arguments, used together, cause Ansible to loop over each monitoring server and load balancer, and perform that operation (delegate that operation) on the monitoring or load balancing server, "on behalf" of the webserver. In programming terms, the outer loop is the list of web servers, and the inner loop is the list of monitoring servers.
Note that the HAProxy step looks a little complicated. We're using HAProxy in this example because it's freely available, though if you have (for instance) an F5 or Netscaler in your infrastructure (or maybe you have an AWS Elastic IP setup?), you can use modules included in core Ansible to communicate with them instead. You might also wish to use other monitoring modules instead of nagios, but this just shows the main goal of the 'pre tasks' section -- take the server out of monitoring, and take it out of rotation.
The next step simply re-applies the proper roles to the web servers. This will cause any configuration management declarations in ``web`` and ``base-apache`` roles to be applied to the web servers, including an update of the web application code itself. We don't have to do it this way--we could instead just purely update the web application, but this is a good example of how roles can be used to reuse tasks::
roles:
- common
- base-apache
- web
Finally, in the ``post_tasks`` section, we reverse the changes to the Nagios configuration and put the web server back in the load balancing pool::
post_tasks:
- name: Enable the server in haproxy
shell: echo "enable server myapplb/{{ inventory_hostname }}" | socat stdio /var/lib/haproxy/stats
delegate_to: "{{ item }}"
with_items: "{{ groups.lbservers }}"
- name: re-enable nagios alerts
nagios: action=enable_alerts host={{ inventory_hostname }} services=webserver
delegate_to: "{{ item }}"
with_items: "{{ groups.monitoring }}"
Again, if you were using a Netscaler or F5 or Elastic Load Balancer, you would just substitute in the appropriate modules instead.
.. _lamp_end_notes:
Managing Other Load Balancers
`````````````````````````````
In this example, we use the simple HAProxy load balancer to front-end the web servers. It's easy to configure and easy to manage. As we have mentioned, Ansible has built-in support for a variety of other load balancers like Citrix NetScaler, F5 BigIP, Amazon Elastic Load Balancers, and more. See the :doc:`modules` documentation for more information.
For other load balancers, you may need to send shell commands to them (like we do for HAProxy above), or call an API, if your load balancer exposes one. For the load balancers for which Ansible has modules, you may want to run them as a ``local_action`` if they contact an API. You can read more about local actions in the :doc:`playbooks_delegation` section. Should you develop anything interesting for some hardware where there is not a core module, it might make for a good module for core inclusion!
.. _lamp_end_to_end:
Continuous Delivery End-To-End
``````````````````````````````
Now that you have an automated way to deploy updates to your application, how do you tie it all together? A lot of organizations use a continuous integration tool like `Jenkins <http://jenkins-ci.org/>`_ or `Atlassian Bamboo <https://www.atlassian.com/software/bamboo>`_ to tie the development, test, release, and deploy steps together. You may also want to use a tool like `Gerrit <https://code.google.com/p/gerrit/>`_ to add a code review step to commits to either the application code itself, or to your Ansible playbooks, or both.
Depending on your environment, you might be deploying continuously to a test environment, running an integration test battery against that environment, and then deploying automatically into production. Or you could keep it simple and just use the rolling-update for on-demand deployment into test or production specifically. This is all up to you.
For integration with Continuous Integration systems, you can easily trigger playbook runs using the ``ansible-playbook`` command line tool, or, if you're using :doc:`tower`, the ``tower-cli`` or the built-in REST API. (The tower-cli command 'joblaunch' will spawn a remote job over the REST API and is pretty slick).
This should give you a good idea of how to structure a multi-tier application with Ansible, and orchestrate operations upon that app, with the eventual goal of continuous delivery to your customers. You could extend the idea of the rolling upgrade to lots of different parts of the app; maybe add front-end web servers along with application servers, for instance, or replace the SQL database with something like MongoDB or Riak. Ansible gives you the capability to easily manage complicated environments and automate common operations.
.. seealso::
`lamp_haproxy example <https://github.com/ansible/ansible-examples/tree/master/lamp_haproxy>`_
The lamp_haproxy example discussed here.
:doc:`playbooks`
An introduction to playbooks
:doc:`playbooks_roles`
An introduction to playbook roles
:doc:`playbooks_variables`
An introduction to Ansible variables
`Ansible.com: Continuous Delivery <http://www.ansible.com/ansible-continuous-delivery>`_
An introduction to Continuous Delivery with Ansible

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Using Vagrant and Ansible
=========================
.. _vagrant_intro:
Introduction
````````````
`Vagrant <http://vagrantup.com/>`_ is a tool to manage virtual machine
environments, and allows you to configure and use reproducible work
environments on top of various virtualization and cloud platforms.
It also has integration with Ansible as a provisioner for these virtual
machines, and the two tools work together well.
This guide will describe how to use Vagrant 1.7+ and Ansible together.
If you're not familiar with Vagrant, you should visit `the documentation
<http://docs.vagrantup.com/v2/>`_.
This guide assumes that you already have Ansible installed and working.
Running from a Git checkout is fine. Follow the :doc:`intro_installation`
guide for more information.
.. _vagrant_setup:
Vagrant Setup
`````````````
The first step once you've installed Vagrant is to create a ``Vagrantfile``
and customize it to suit your needs. This is covered in detail in the Vagrant
documentation, but here is a quick example that includes a section to use the
Ansible provisioner to manage a single machine:
.. code-block:: ruby
# This guide is optimized for Vagrant 1.7 and above.
# Although versions 1.6.x should behave very similarly, it is recommended
# to upgrade instead of disabling the requirement below.
Vagrant.require_version ">= 1.7.0"
Vagrant.configure(2) do |config|
config.vm.box = "ubuntu/trusty64"
# Disable the new default behavior introduced in Vagrant 1.7, to
# ensure that all Vagrant machines will use the same SSH key pair.
# See https://github.com/mitchellh/vagrant/issues/5005
config.ssh.insert_key = false
config.vm.provision "ansible" do |ansible|
ansible.verbose = "v"
ansible.playbook = "playbook.yml"
end
end
Notice the ``config.vm.provision`` section that refers to an Ansible playbook
called ``playbook.yml`` in the same directory as the ``Vagrantfile``. Vagrant
runs the provisioner once the virtual machine has booted and is ready for SSH
access.
There are a lot of Ansible options you can configure in your ``Vagrantfile``.
Visit the `Ansible Provisioner documentation
<http://docs.vagrantup.com/v2/provisioning/ansible.html>`_ for more
information.
.. code-block:: bash
$ vagrant up
This will start the VM, and run the provisioning playbook (on the first VM
startup).
To re-run a playbook on an existing VM, just run:
.. code-block:: bash
$ vagrant provision
This will re-run the playbook against the existing VM.
Note that having the ``ansible.verbose`` option enabled will instruct Vagrant
to show the full ``ansible-playbook`` command used behind the scene, as
illustrated by this example:
.. code-block:: bash
$ PYTHONUNBUFFERED=1 ANSIBLE_FORCE_COLOR=true ANSIBLE_HOST_KEY_CHECKING=false ANSIBLE_SSH_ARGS='-o UserKnownHostsFile=/dev/null -o ControlMaster=auto -o ControlPersist=60s' ansible-playbook --private-key=/home/someone/.vagrant.d/insecure_private_key --user=vagrant --connection=ssh --limit='machine1' --inventory-file=/home/someone/coding-in-a-project/.vagrant/provisioners/ansible/inventory/vagrant_ansible_inventory playbook.yml
This information can be quite useful to debug integration issues and can also
be used to manually execute Ansible from a shell, as explained in the next
section.
.. _running_ansible:
Running Ansible Manually
````````````````````````
Sometimes you may want to run Ansible manually against the machines. This is
faster than kicking ``vagrant provision`` and pretty easy to do.
With our ``Vagrantfile`` example, Vagrant automatically creates an Ansible
inventory file in ``.vagrant/provisioners/ansible/inventory/vagrant_ansible_inventory``.
This inventory is configured according to the SSH tunnel that Vagrant
automatically creates. A typical automatically-created inventory file for a
single machine environment may look something like this:
.. code-block:: none
# Generated by Vagrant
default ansible_ssh_host=127.0.0.1 ansible_ssh_port=2222
If you want to run Ansible manually, you will want to make sure to pass
``ansible`` or ``ansible-playbook`` commands the correct arguments, at least
for the *username*, the *SSH private key* and the *inventory*.
Here is an example using the Vagrant global insecure key (``config.ssh.insert_key``
must be set to ``false`` in your ``Vagrantfile``):
.. code-block:: bash
$ ansible-playbook --private-key=~/.vagrant.d/insecure_private_key -u vagrant -i .vagrant/provisioners/ansible/inventory/vagrant_ansible_inventory playbook.yml
Here is a second example using the random private key that Vagrant 1.7+
automatically configures for each new VM (each key is stored in a path like
``.vagrant/machines/[machine name]/[provider]/private_key``):
.. code-block:: bash
$ ansible-playbook --private-key=.vagrant/machines/default/virtualbox/private_key -u vagrant -i .vagrant/provisioners/ansible/inventory/vagrant_ansible_inventory playbook.yml
Advanced Usages
```````````````
The "Tips and Tricks" chapter of the `Ansible Provisioner documentation
<http://docs.vagrantup.com/v2/provisioning/ansible.html>`_ provides detailed information about more advanced Ansible features like:
- how to parallely execute a playbook in a multi-machine environment
- how to integrate a local ``ansible.cfg`` configuration file
.. seealso::
`Vagrant Home <http://www.vagrantup.com/>`_
The Vagrant homepage with downloads
`Vagrant Documentation <http://docs.vagrantup.com/v2/>`_
Vagrant Documentation
`Ansible Provisioner <http://docs.vagrantup.com/v2/provisioning/ansible.html>`_
The Vagrant documentation for the Ansible provisioner
`Vagrant Issue Tracker <https://github.com/mitchellh/vagrant/issues?q=is%3Aopen+is%3Aissue+label%3Aprovisioners%2Fansible>`_
The open issues for the Ansible provisioner in the Vagrant project
:doc:`playbooks`
An introduction to playbooks

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Detailed Guides
```````````````
This section is new and evolving. The idea here is to explore particular use cases in greater depth and provide a more "top down" explanation of some basic features.
.. toctree::
:maxdepth: 1
guide_aws
guide_azure
guide_rax
guide_gce
guide_cloudstack
guide_vagrant
guide_rolling_upgrade
guide_docker
Pending topics may include: Docker, Jenkins, Google Compute Engine, Linode/DigitalOcean, Continuous Deployment, and more.

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Ansible Documentation
=====================
About Ansible
`````````````
Welcome to the Ansible documentation!
Ansible is an IT automation tool. It can configure systems, deploy software, and orchestrate more advanced IT tasks
such as continuous deployments or zero downtime rolling updates.
Ansible's main goals are simplicity and ease-of-use. It also has a strong focus on security and reliability, featuring a minimum of moving parts, usage of OpenSSH for transport (with an accelerated socket mode and pull modes as alternatives), and a language that is designed around auditability by humans--even those not familiar with the program.
We believe simplicity is relevant to all sizes of environments, so we design for busy users of all types: developers, sysadmins, release engineers, IT managers, and everyone in between. Ansible is appropriate for managing all environments, from small setups with a handful of instances to enterprise environments with many thousands of instances.
Ansible manages machines in an agent-less manner. There is never a question of how to
upgrade remote daemons or the problem of not being able to manage systems because daemons are uninstalled. Because OpenSSH is one of the most peer-reviewed open source components, security exposure is greatly reduced. Ansible is decentralized--it relies on your existing OS credentials to control access to remote machines. If needed, Ansible can easily connect with Kerberos, LDAP, and other centralized authentication management systems.
This documentation covers the current released version of Ansible (|version|) and also some development version features (|versiondev|). For recent features, we note in each section the version of Ansible where the feature was added.
Ansible, Inc. releases a new major release of Ansible approximately every two months. The core application evolves somewhat conservatively, valuing simplicity in language design and setup. However, the community around new modules and plugins being developed and contributed moves very quickly, typically adding 20 or so new modules in each release.
.. _an_introduction:
.. toctree::
:maxdepth: 1
intro
quickstart
playbooks
playbooks_special_topics
modules
modules_by_category
guides
dev_guide/index
tower
community
galaxy
test_strategies
faq
glossary
YAMLSyntax
porting_guide_2.0
python_3_support

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Introduction
============
Before we dive into the really fun parts -- playbooks, configuration management, deployment, and orchestration -- we'll learn how to get Ansible installed and cover some basic concepts. We'll also go over how to execute ad-hoc commands in parallel across your nodes using /usr/bin/ansible, and see what sort of modules are available in Ansible's core (you can also write your own, which is covered later).
.. toctree::
:maxdepth: 1
intro_installation
intro_getting_started
intro_inventory
intro_dynamic_inventory
intro_patterns
intro_adhoc
intro_configuration
intro_bsd
intro_windows
intro_networking

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Introduction To Ad-Hoc Commands
===============================
.. contents:: Topics
.. highlight:: bash
The following examples show how to use `/usr/bin/ansible` for running
ad hoc tasks.
What's an ad-hoc command?
An ad-hoc command is something that you might type in to do something really
quick, but don't want to save for later.
This is a good place to start to understand the basics of what Ansible can do
prior to learning the playbooks language -- ad-hoc commands can also be used
to do quick things that you might not necessarily want to write a full playbook for.
Generally speaking, the true power of Ansible lies in playbooks.
Why would you use ad-hoc tasks versus playbooks?
For instance, if you wanted to power off all of your lab for Christmas vacation,
you could execute a quick one-liner in Ansible without writing a playbook.
For configuration management and deployments, though, you'll want to pick up on
using '/usr/bin/ansible-playbook' -- the concepts you will learn here will
port over directly to the playbook language.
(See :doc:`playbooks` for more information about those)
If you haven't read :doc:`intro_inventory` already, please look that over a bit first
and then we'll get going.
.. _parallelism_and_shell_commands:
Parallelism and Shell Commands
``````````````````````````````
Arbitrary example.
Let's use Ansible's command line tool to reboot all web servers in Atlanta, 10 at a time. First, let's
set up SSH-agent so it can remember our credentials::
$ ssh-agent bash
$ ssh-add ~/.ssh/id_rsa
If you don't want to use ssh-agent and want to instead SSH with a
password instead of keys, you can with ``--ask-pass`` (``-k``), but
it's much better to just use ssh-agent.
Now to run the command on all servers in a group, in this case,
*atlanta*, in 10 parallel forks::
$ ansible atlanta -a "/sbin/reboot" -f 10
/usr/bin/ansible will default to running from your user account. If you do not like this
behavior, pass in "-u username". If you want to run commands as a different user, it looks like this::
$ ansible atlanta -a "/usr/bin/foo" -u username
Often you'll not want to just do things from your user account. If you want to run commands through privilege escalation::
$ ansible atlanta -a "/usr/bin/foo" -u username --become [--ask-become-pass]
Use ``--ask-become-pass`` (``-K``) if you are not using a passwordless privilege escalation method (sudo/su/pfexec/doas/etc).
This will interactively prompt you for the password to use.
Use of a passwordless setup makes things easier to automate, but it's not required.
It is also possible to become a user other than root using
``--become-user``::
$ ansible atlanta -a "/usr/bin/foo" -u username --become-user otheruser [--ask-become-pass]
.. note::
Rarely, some users have security rules where they constrain their sudo/pbrun/doas environment to running specific command paths only.
This does not work with ansible's no-bootstrapping philosophy and hundreds of different modules.
If doing this, use Ansible from a special account that does not have this constraint.
One way of doing this without sharing access to unauthorized users would be gating Ansible with :doc:`tower`, which
can hold on to an SSH credential and let members of certain organizations use it on their behalf without having direct access.
Ok, so those are basics. If you didn't read about patterns and groups yet, go back and read :doc:`intro_patterns`.
The ``-f 10`` in the above specifies the usage of 10 simultaneous
processes to use. You can also set this in :doc:`intro_configuration` to avoid setting it again. The default is actually 5, which
is really small and conservative. You are probably going to want to talk to a lot more simultaneous hosts so feel free
to crank this up. If you have more hosts than the value set for the fork count, Ansible will talk to them, but it will
take a little longer. Feel free to push this value as high as your system can handle!
You can also select what Ansible "module" you want to run. Normally commands also take a ``-m`` for module name, but
the default module name is 'command', so we didn't need to
specify that all of the time. We'll use ``-m`` in later examples to
run some other :doc:`modules`.
.. note::
The :ref:`command` module does not support extended shell syntax like piping and redirects (although
shell variables will always work). If your command requires shell-specific syntax, use the `shell` module
instead. Read more about the differences on the :doc:`modules` page.
Using the :ref:`shell` module looks like this::
$ ansible raleigh -m shell -a 'echo $TERM'
When running any command with the Ansible *ad hoc* CLI (as opposed to
:doc:`Playbooks <playbooks>`), pay particular attention to shell quoting rules, so
the local shell doesn't eat a variable before it gets passed to Ansible.
For example, using double rather than single quotes in the above example would
evaluate the variable on the box you were on.
So far we've been demoing simple command execution, but most Ansible modules are not simple imperative scripts. Instead, they use a declarative model,
calculating and executing the actions required to reach a specified final state.
Furthermore, they achieve a form of idempotence by checking the current state
before they begin, and if the current state matches the specified final state,
doing nothing.
However, we also recognize that running arbitrary commands can be valuable, so Ansible easily supports both.
.. _file_transfer:
File Transfer
`````````````
Here's another use case for the `/usr/bin/ansible` command line. Ansible can SCP lots of files to multiple machines in parallel.
To transfer a file directly to many servers::
$ ansible atlanta -m copy -a "src=/etc/hosts dest=/tmp/hosts"
If you use playbooks, you can also take advantage of the ``template`` module,
which takes this another step further. (See module and playbook documentation).
The ``file`` module allows changing ownership and permissions on files. These
same options can be passed directly to the ``copy`` module as well::
$ ansible webservers -m file -a "dest=/srv/foo/a.txt mode=600"
$ ansible webservers -m file -a "dest=/srv/foo/b.txt mode=600 owner=mdehaan group=mdehaan"
The ``file`` module can also create directories, similar to ``mkdir -p``::
$ ansible webservers -m file -a "dest=/path/to/c mode=755 owner=mdehaan group=mdehaan state=directory"
As well as delete directories (recursively) and delete files::
$ ansible webservers -m file -a "dest=/path/to/c state=absent"
.. _managing_packages:
Managing Packages
`````````````````
There are modules available for yum and apt. Here are some examples
with yum.
Ensure a package is installed, but don't update it::
$ ansible webservers -m yum -a "name=acme state=present"
Ensure a package is installed to a specific version::
$ ansible webservers -m yum -a "name=acme-1.5 state=present"
Ensure a package is at the latest version::
$ ansible webservers -m yum -a "name=acme state=latest"
Ensure a package is not installed::
$ ansible webservers -m yum -a "name=acme state=absent"
Ansible has modules for managing packages under many platforms. If there isn't
a module for your package manager, you can install packages using the
command module or (better!) contribute a module for your package manager.
Stop by the mailing list for info/details.
.. _users_and_groups:
Users and Groups
````````````````
The 'user' module allows easy creation and manipulation of
existing user accounts, as well as removal of user accounts that may
exist::
$ ansible all -m user -a "name=foo password=<crypted password here>"
$ ansible all -m user -a "name=foo state=absent"
See the :doc:`modules` section for details on all of the available options, including
how to manipulate groups and group membership.
.. _from_source_control:
Deploying From Source Control
`````````````````````````````
Deploy your webapp straight from git::
$ ansible webservers -m git -a "repo=git://foo.example.org/repo.git dest=/srv/myapp version=HEAD"
Since Ansible modules can notify change handlers it is possible to
tell Ansible to run specific tasks when the code is updated, such as
deploying Perl/Python/PHP/Ruby directly from git and then restarting
apache.
.. _managing_services:
Managing Services
`````````````````
Ensure a service is started on all webservers::
$ ansible webservers -m service -a "name=httpd state=started"
Alternatively, restart a service on all webservers::
$ ansible webservers -m service -a "name=httpd state=restarted"
Ensure a service is stopped::
$ ansible webservers -m service -a "name=httpd state=stopped"
.. _time_limited_background_operations:
Time Limited Background Operations
``````````````````````````````````
Long running operations can be run in the background, and it is possible to
check their status later. For example, to execute ``long_running_operation``
asynchronously in the background, with a timeout of 3600 seconds (``-B``),
and without polling (``-P``)::
$ ansible all -B 3600 -P 0 -a "/usr/bin/long_running_operation --do-stuff"
If you do decide you want to check on the job status later, you can use the
async_status module, passing it the job id that was returned when you ran
the original job in the background::
$ ansible web1.example.com -m async_status -a "jid=488359678239.2844"
Polling is built-in and looks like this::
$ ansible all -B 1800 -P 60 -a "/usr/bin/long_running_operation --do-stuff"
The above example says "run for 30 minutes max (``-B`` 30*60=1800),
poll for status (``-P``) every 60 seconds".
Poll mode is smart so all jobs will be started before polling will begin on any machine.
Be sure to use a high enough ``--forks`` value if you want to get all of your jobs started
very quickly. After the time limit (in seconds) runs out (``-B``), the process on
the remote nodes will be terminated.
Typically you'll only be backgrounding long-running
shell commands or software upgrades. Backgrounding the copy module does not do a background file transfer. :doc:`Playbooks <playbooks>` also support polling, and have a simplified syntax for this.
.. _checking_facts:
Gathering Facts
```````````````
Facts are described in the playbooks section and represent discovered variables about a
system. These can be used to implement conditional execution of tasks but also just to get ad-hoc information about your system. You can see all facts via::
$ ansible all -m setup
It's also possible to filter this output to just export certain facts, see the "setup" module documentation for details.
Read more about facts at :doc:`playbooks_variables` once you're ready to read up on :doc:`Playbooks <playbooks>`.
.. seealso::
:doc:`intro_configuration`
All about the Ansible config file
:doc:`modules`
A list of available modules
:doc:`playbooks`
Using Ansible for configuration management & deployment
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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BSD Support
===========
.. contents:: Topics
.. _working_with_bsd:
Working with BSD
````````````````
Ansible manages Linux/Unix machines using SSH by default. BSD machines are no exception, however this document covers some of the differences you may encounter with Ansible when working with BSD variants.
Typically, Ansible will try to default to using OpenSSH as a connection method. This is suitable when using SSH keys to authenticate, but when using SSH passwords, Ansible relies on sshpass. Most
versions of sshpass do not deal particularly well with BSD login prompts, so when using SSH passwords against BSD machines, it is recommended to change the transport method to paramiko. You can do this in ansible.cfg globally or you can set it as an inventory/group/host variable. For example::
[freebsd]
mybsdhost1 ansible_connection=paramiko
Ansible is agentless by default, however certain software is required on the target machines. Using Python 2.4 on the agents requires an additional py-simplejson package/library to be installed, however this library is already included in Python 2.5 and above.
Operating without Python is possible with the ``raw`` module. Although this module can be used to bootstrap Ansible and install Python on BSD variants (see below), it is very limited and the use of Python is required to make full use of Ansible's features.
.. _bootstrap_bsd:
Bootstrapping BSD
`````````````````
As mentioned above, you can bootstrap Ansible with the ``raw`` module and remotely install Python on targets. The following example installs Python 2.7 which includes the json library required for full functionality of Ansible.
On your control machine you can simply execute the following for most versions of FreeBSD::
ansible -m raw -a “pkg install -y python27” mybsdhost1
Once this is done you can now use other Ansible modules apart from the ``raw`` module.
.. note::
This example used pkg as used on FreeBSD, however you should be able to substitute the appropriate package tool for your BSD; the package name may also differ. Refer to the package list or documentation of the BSD variant you are using for the exact Python package name you intend to install.
.. _python_location:
Setting the Python interpreter
``````````````````````````````
To support a variety of Unix/Linux operating systems and distributions, Ansible cannot always rely on the existing environment or ``env`` variables to locate the correct Python binary. By default, modules point at ``/usr/bin/python`` as this is the most common location. On BSD variants, this path may differ, so it is advised to inform Ansible of the binary's location, through the ``ansible_python_interpreter`` inventory variable. For example::
[freebsd:vars]
ansible_python_interpreter=/usr/local/bin/python2.7
If you use additional plugins beyond those bundled with Ansible, you can set similar variables for ``bash``, ``perl`` or ``ruby``, depending on how the plugin is written. For example::
[freebsd:vars]
ansible_python_interpreter=/usr/local/bin/python
ansible_perl_interpreter=/usr/bin/perl5
Which modules are available?
````````````````````````````
The majority of the core Ansible modules are written for a combination of Linux/Unix machines and other generic services, so most should function well on the BSDs with the obvious exception of those that are aimed at Linux-only technologies (such as LVG).
Using BSD as the control machine
````````````````````````````````
Using BSD as the control machine is as simple as installing the Ansible package for your BSD variant or by following the ``pip`` or 'from source' instructions.
.. _bsd_facts:
BSD Facts
`````````
Ansible gathers facts from the BSDs in a similar manner to Linux machines, but since the data, names and structures can vary for network, disks and other devices, one should expect the output to be slightly different yet still familiar to a BSD administrator.
.. _bsd_contributions:
BSD Efforts and Contributions
`````````````````````````````
BSD support is important to us at Ansible. Even though the majority of our contributors use and target Linux we have an active BSD community and strive to be as BSD friendly as possible.
Please feel free to report any issues or incompatibilities you discover with BSD; pull requests with an included fix are also welcome!
.. seealso::
:doc:`intro_adhoc`
Examples of basic commands
:doc:`playbooks`
Learning ansible's configuration management language
:doc:`developing_modules`
How to write modules
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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.. _dynamic_inventory:
Dynamic Inventory
=================
.. contents:: Topics
Often a user of a configuration management system will want to keep inventory
in a different software system. Ansible provides a basic text-based system as described in
:doc:`intro_inventory` but what if you want to use something else?
Frequent examples include pulling inventory from a cloud provider, LDAP, `Cobbler <http://cobbler.github.com>`_,
or a piece of expensive enterprisey CMDB software.
Ansible easily supports all of these options via an external inventory system. The contrib/inventory directory contains some of these already -- including options for EC2/Eucalyptus, Rackspace Cloud, and OpenStack, examples of some of which will be detailed below.
:doc:`tower` also provides a database to store inventory results that is both web and REST Accessible. Tower syncs with all Ansible dynamic inventory sources you might be using, and also includes a graphical inventory editor. By having a database record of all of your hosts, it's easy to correlate past event history and see which ones have had failures on their last playbook runs.
For information about writing your own dynamic inventory source, see :doc:`dev_guide/developing_inventory`.
.. _cobbler_example:
Example: The Cobbler External Inventory Script
``````````````````````````````````````````````
It is expected that many Ansible users with a reasonable amount of physical hardware may also be `Cobbler <http://cobbler.github.com>`_ users. (note: Cobbler was originally written by Michael DeHaan and is now led by James Cammarata, who also works for Ansible, Inc).
While primarily used to kickoff OS installations and manage DHCP and DNS, Cobbler has a generic
layer that allows it to represent data for multiple configuration management systems (even at the same time), and has
been referred to as a 'lightweight CMDB' by some admins.
To tie Ansible's inventory to Cobbler (optional), copy `this script <https://raw.github.com/ansible/ansible/devel/contrib/inventory/cobbler.py>`_ to ``/etc/ansible`` and ``chmod +x`` the file. cobblerd will now need
to be running when you are using Ansible and you'll need to use Ansible's ``-i`` command line option (e.g. ``-i /etc/ansible/cobbler.py``).
This particular script will communicate with Cobbler using Cobbler's XMLRPC API.
Also a ``cobbler.ini`` file should be added to ``/etc/ansible`` so Ansible knows where the Cobbler server is and some cache improvements can be used. For example::
[cobbler]
# Set Cobbler's hostname or IP address
host = http://127.0.0.1/cobbler_api
# API calls to Cobbler can be slow. For this reason, we cache the results of an API
# call. Set this to the path you want cache files to be written to. Two files
# will be written to this directory:
# - ansible-cobbler.cache
# - ansible-cobbler.index
cache_path = /tmp
# The number of seconds a cache file is considered valid. After this many
# seconds, a new API call will be made, and the cache file will be updated.
cache_max_age = 900
First test the script by running ``/etc/ansible/cobbler.py`` directly. You should see some JSON data output, but it may not have anything in it just yet.
Let's explore what this does. In Cobbler, assume a scenario somewhat like the following::
cobbler profile add --name=webserver --distro=CentOS6-x86_64
cobbler profile edit --name=webserver --mgmt-classes="webserver" --ksmeta="a=2 b=3"
cobbler system edit --name=foo --dns-name="foo.example.com" --mgmt-classes="atlanta" --ksmeta="c=4"
cobbler system edit --name=bar --dns-name="bar.example.com" --mgmt-classes="atlanta" --ksmeta="c=5"
In the example above, the system 'foo.example.com' will be addressable by ansible directly, but will also be addressable when using the group names 'webserver' or 'atlanta'. Since Ansible uses SSH, we'll try to contact system foo over 'foo.example.com', only, never just 'foo'. Similarly, if you try "ansible foo" it wouldn't find the system... but "ansible 'foo*'" would, because the system DNS name starts with 'foo'.
The script doesn't just provide host and group info. In addition, as a bonus, when the 'setup' module is run (which happens automatically when using playbooks), the variables 'a', 'b', and 'c' will all be auto-populated in the templates::
# file: /srv/motd.j2
Welcome, I am templated with a value of a={{ a }}, b={{ b }}, and c={{ c }}
Which could be executed just like this::
ansible webserver -m setup
ansible webserver -m template -a "src=/tmp/motd.j2 dest=/etc/motd"
.. note::
The name 'webserver' came from Cobbler, as did the variables for
the config file. You can still pass in your own variables like
normal in Ansible, but variables from the external inventory script
will override any that have the same name.
So, with the template above (``motd.j2``), this would result in the following data being written to ``/etc/motd`` for system 'foo'::
Welcome, I am templated with a value of a=2, b=3, and c=4
And on system 'bar' (bar.example.com)::
Welcome, I am templated with a value of a=2, b=3, and c=5
And technically, though there is no major good reason to do it, this also works too::
ansible webserver -m shell -a "echo {{ a }}"
So in other words, you can use those variables in arguments/actions as well.
.. _aws_example:
Example: AWS EC2 External Inventory Script
``````````````````````````````````````````
If you use Amazon Web Services EC2, maintaining an inventory file might not be the best approach, because hosts may come and go over time, be managed by external applications, or you might even be using AWS autoscaling. For this reason, you can use the `EC2 external inventory <https://raw.github.com/ansible/ansible/devel/contrib/inventory/ec2.py>`_ script.
You can use this script in one of two ways. The easiest is to use Ansible's ``-i`` command line option and specify the path to the script after
marking it executable::
ansible -i ec2.py -u ubuntu us-east-1d -m ping
The second option is to copy the script to `/etc/ansible/hosts` and `chmod +x` it. You will also need to copy the `ec2.ini <https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/ec2.ini>`_ file to `/etc/ansible/ec2.ini`. Then you can run ansible as you would normally.
To successfully make an API call to AWS, you will need to configure Boto (the Python interface to AWS). There are a `variety of methods <http://docs.pythonboto.org/en/latest/boto_config_tut.html>`_ available, but the simplest is just to export two environment variables::
export AWS_ACCESS_KEY_ID='AK123'
export AWS_SECRET_ACCESS_KEY='abc123'
You can test the script by itself to make sure your config is correct::
cd contrib/inventory
./ec2.py --list
After a few moments, you should see your entire EC2 inventory across all regions in JSON.
If you use Boto profiles to manage multiple AWS accounts, you can pass ``--profile PROFILE`` name to the ``ec2.py`` script. An example profile might be::
[profile dev]
aws_access_key_id = <dev access key>
aws_secret_access_key = <dev secret key>
[profile prod]
aws_access_key_id = <prod access key>
aws_secret_access_key = <prod secret key>
You can then run ``ec2.py --profile prod`` to get the inventory for the prod account, although this option is not supported by ``ansible-playbook``.
You can also use the ``AWS_PROFILE`` variable - for example: ``AWS_PROFILE=prod ansible-playbook -i ec2.py myplaybook.yml``
Since each region requires its own API call, if you are only using a small set of regions, you can edit the ``ec2.ini`` file and comment out the regions you are not using.
There are other config options in ``ec2.ini``, including cache control and destination variables. By default, the ``ec2.ini`` file is configured for **all Amazon cloud services**, but you can comment out any features that aren't applicable. For example, if you don't have ``RDS`` or ``elasticache``, you can set them to ``False`` ::
[ec2]
...
# To exclude RDS instances from the inventory, uncomment and set to False.
rds = False
# To exclude ElastiCache instances from the inventory, uncomment and set to False.
elasticache = False
...
At their heart, inventory files are simply a mapping from some name to a destination address. The default ``ec2.ini`` settings are configured for running Ansible from outside EC2 (from your laptop for example) -- and this is not the most efficient way to manage EC2.
If you are running Ansible from within EC2, internal DNS names and IP addresses may make more sense than public DNS names. In this case, you can modify the ``destination_variable`` in ``ec2.ini`` to be the private DNS name of an instance. This is particularly important when running Ansible within a private subnet inside a VPC, where the only way to access an instance is via its private IP address. For VPC instances, `vpc_destination_variable` in ``ec2.ini`` provides a means of using which ever `boto.ec2.instance variable <http://docs.pythonboto.org/en/latest/ref/ec2.html#module-boto.ec2.instance>`_ makes the most sense for your use case.
The EC2 external inventory provides mappings to instances from several groups:
Global
All instances are in group ``ec2``.
Instance ID
These are groups of one since instance IDs are unique.
e.g.
``i-00112233``
``i-a1b1c1d1``
Region
A group of all instances in an AWS region.
e.g.
``us-east-1``
``us-west-2``
Availability Zone
A group of all instances in an availability zone.
e.g.
``us-east-1a``
``us-east-1b``
Security Group
Instances belong to one or more security groups. A group is created for each security group, with all characters except alphanumerics, converted to underscores (_). Each group is prefixed by ``security_group_``. Currently, dashes (-) are also converted to underscores (_). You can change using the replace_dash_in_groups setting in ec2.ini (this has changed across several versions so check the ec2.ini for details).
e.g.
``security_group_default``
``security_group_webservers``
``security_group_Pete_s_Fancy_Group``
Tags
Each instance can have a variety of key/value pairs associated with it called Tags. The most common tag key is 'Name', though anything is possible. Each key/value pair is its own group of instances, again with special characters converted to underscores, in the format ``tag_KEY_VALUE``
e.g.
``tag_Name_Web`` can be used as is
``tag_Name_redis-master-001`` becomes ``tag_Name_redis_master_001``
``tag_aws_cloudformation_logical-id_WebServerGroup`` becomes ``tag_aws_cloudformation_logical_id_WebServerGroup``
When the Ansible is interacting with a specific server, the EC2 inventory script is called again with the ``--host HOST`` option. This looks up the HOST in the index cache to get the instance ID, and then makes an API call to AWS to get information about that specific instance. It then makes information about that instance available as variables to your playbooks. Each variable is prefixed by ``ec2_``. Here are some of the variables available:
- ec2_architecture
- ec2_description
- ec2_dns_name
- ec2_id
- ec2_image_id
- ec2_instance_type
- ec2_ip_address
- ec2_kernel
- ec2_key_name
- ec2_launch_time
- ec2_monitored
- ec2_ownerId
- ec2_placement
- ec2_platform
- ec2_previous_state
- ec2_private_dns_name
- ec2_private_ip_address
- ec2_public_dns_name
- ec2_ramdisk
- ec2_region
- ec2_root_device_name
- ec2_root_device_type
- ec2_security_group_ids
- ec2_security_group_names
- ec2_spot_instance_request_id
- ec2_state
- ec2_state_code
- ec2_state_reason
- ec2_status
- ec2_subnet_id
- ec2_tag_Name
- ec2_tenancy
- ec2_virtualization_type
- ec2_vpc_id
Both ``ec2_security_group_ids`` and ``ec2_security_group_names`` are comma-separated lists of all security groups. Each EC2 tag is a variable in the format ``ec2_tag_KEY``.
To see the complete list of variables available for an instance, run the script by itself::
cd contrib/inventory
./ec2.py --host ec2-12-12-12-12.compute-1.amazonaws.com
Note that the AWS inventory script will cache results to avoid repeated API calls, and this cache setting is configurable in ec2.ini. To
explicitly clear the cache, you can run the ec2.py script with the ``--refresh-cache`` parameter::
./ec2.py --refresh-cache
.. _openstack_example:
Example: OpenStack External Inventory Script
````````````````````````````````````````````
If you use an OpenStack based cloud, instead of manually maintaining your own inventory file, you can use the openstack.py dynamic inventory to pull information about your compute instances directly from OpenStack.
You can download the latest version of the OpenStack inventory script at: https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/openstack.py
You can use the inventory script explicitly (by passing the `-i openstack.py` argument to Ansible) or implicitly (by placing the script at `/etc/ansible/hosts`).
Explicit use of inventory script
++++++++++++++++++++++++++++++++
Download the latest version of the OpenStack dynamic inventory script and make it executable::
wget https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/openstack.py
chmod +x openstack.py
Source an OpenStack RC file::
source openstack.rc
.. note::
An OpenStack RC file contains the environment variables required by the client tools to establish a connection with the cloud provider, such as the authentication URL, user name, password and region name. For more information on how to download, create or source an OpenStack RC file, please refer to `Set environment variables using the OpenStack RC file <http://docs.openstack.org/cli-reference/common/cli_set_environment_variables_using_openstack_rc.html>`_.
You can confirm the file has been successfully sourced by running a simple command, such as `nova list` and ensuring it return no errors.
.. note::
The OpenStack command line clients are required to run the `nova list` command. For more information on how to install them, please refer to `Install the OpenStack command-line clients <http://docs.openstack.org/cli-reference/common/cli_install_openstack_command_line_clients.html>`_.
You can test the OpenStack dynamic inventory script manually to confirm it is working as expected::
./openstack.py --list
After a few moments you should see some JSON output with information about your compute instances.
Once you confirm the dynamic inventory script is working as expected, you can tell Ansible to use the `openstack.py` script as an inventory file, as illustrated below::
ansible -i openstack.py all -m ping
Implicit use of inventory script
++++++++++++++++++++++++++++++++
Download the latest version of the OpenStack dynamic inventory script, make it executable and copy it to `/etc/ansible/hosts`::
wget https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/openstack.py
chmod +x openstack.py
sudo cp openstack.py /etc/ansible/hosts
Download the sample configuration file, modify it to suit your needs and copy it to `/etc/ansible/openstack.yml`::
wget https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/openstack.yml
vi openstack.yml
sudo cp openstack.yml /etc/ansible/
You can test the OpenStack dynamic inventory script manually to confirm it is working as expected::
/etc/ansible/hosts --list
After a few moments you should see some JSON output with information about your compute instances.
Refresh the cache
+++++++++++++++++
Note that the OpenStack dynamic inventory script will cache results to avoid repeated API calls. To explicitly clear the cache, you can run the openstack.py (or hosts) script with the ``--refresh`` parameter::
./openstack.py --refresh --list
.. _other_inventory_scripts:
Other inventory scripts
```````````````````````
In addition to Cobbler and EC2, inventory scripts are also available for::
BSD Jails
DigitalOcean
Google Compute Engine
Linode
OpenShift
OpenStack Nova
Ovirt
SpaceWalk
Vagrant (not to be confused with the provisioner in vagrant, which is preferred)
Zabbix
Sections on how to use these in more detail will be added over time, but by looking at the "contrib/inventory" directory of the Ansible checkout
it should be very obvious how to use them. The process for the AWS inventory script is the same.
If you develop an interesting inventory script that might be general purpose, please submit a pull request -- we'd likely be glad
to include it in the project.
.. _using_multiple_sources:
Using Inventory Directories and Multiple Inventory Sources
``````````````````````````````````````````````````````````
If the location given to ``-i`` in Ansible is a directory (or as so configured in ``ansible.cfg``), Ansible can use multiple inventory sources
at the same time. When doing so, it is possible to mix both dynamic and statically managed inventory sources in the same ansible run. Instant
hybrid cloud!
In an inventory directory, executable files will be treated as dynamic inventory sources and most other files as static sources. Files which end with any of the following will be ignored::
~, .orig, .bak, .ini, .retry, .pyc, .pyo
You can replace this list with your own selection by configuring an ``inventory_ignore_extensions`` list in ansible.cfg, or setting the ANSIBLE_INVENTORY_IGNORE environment variable. The value in either case should be a comma-separated list of patterns, as shown above.
Any ``group_vars`` and ``host_vars`` subdirectories in an inventory directory will be interpreted as expected, making inventory directories a powerful way to organize different sets of configurations.
.. _static_groups_of_dynamic:
Static Groups of Dynamic Groups
```````````````````````````````
When defining groups of groups in the static inventory file, the child groups
must also be defined in the static inventory file, or ansible will return an
error. If you want to define a static group of dynamic child groups, define
the dynamic groups as empty in the static inventory file. For example::
[tag_Name_staging_foo]
[tag_Name_staging_bar]
[staging:children]
tag_Name_staging_foo
tag_Name_staging_bar
.. seealso::
:doc:`intro_inventory`
All about static inventory files
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Getting Started
===============
.. contents:: Topics
.. _gs_about:
Foreword
````````
Now that you've read :doc:`intro_installation` and installed Ansible, it's time to dig in and get
started with some commands.
What we are showing first are not the powerful configuration/deployment/orchestration features of Ansible.
These features are handled by playbooks which are covered in a separate section.
This section is about how to initially get going. Once you have these concepts down, read :doc:`intro_adhoc` for some more
detail, and then you'll be ready to dive into playbooks and explore the most interesting parts!
.. _remote_connection_information:
Remote Connection Information
`````````````````````````````
Before we get started, it's important to understand how Ansible communicates with remote
machines over SSH.
By default, Ansible 1.3 and later will try to use native
OpenSSH for remote communication when possible. This enables ControlPersist (a performance feature), Kerberos, and options in ``~/.ssh/config`` such as Jump Host setup. However, when using Enterprise Linux 6 operating systems as the control machine (Red Hat Enterprise Linux and derivatives such as CentOS), the version of OpenSSH may be too old to support ControlPersist. On these operating systems, Ansible will fallback into using a high-quality Python implementation of
OpenSSH called 'paramiko'. If you wish to use features like Kerberized SSH and more, consider using Fedora, OS X, or Ubuntu as your control machine until a newer version of OpenSSH is available for your platform -- or engage 'accelerated mode' in Ansible. See :doc:`playbooks_acceleration`.
In releases up to and including Ansible 1.2, the default was strictly paramiko. Native SSH had to be explicitly selected with the ``-c`` ssh option or set in the configuration file.
Occasionally you'll encounter a device that doesn't support SFTP. This is rare, but should it occur, you can switch to SCP mode in :doc:`intro_configuration`.
When speaking with remote machines, Ansible by default assumes you are using SSH keys. SSH keys are encouraged but password authentication can also be used where needed by supplying the option ``--ask-pass``. If using sudo features and when sudo requires a password, also supply ``--ask-become-pass`` (previously ``--ask-sudo-pass`` which has been deprecated).
While it may be common sense, it is worth sharing: Any management system benefits from being run near the machines being managed. If you are running Ansible in a cloud, consider running it from a machine inside that cloud. In most cases this will work better than on the open Internet.
As an advanced topic, Ansible doesn't just have to connect remotely over SSH. The transports are pluggable, and there are options for managing things locally, as well as managing chroot, lxc, and jail containers. A mode called 'ansible-pull' can also invert the system and have systems 'phone home' via scheduled git checkouts to pull configuration directives from a central repository.
.. _your_first_commands:
Your first commands
```````````````````
Now that you've installed Ansible, it's time to get started with some basics.
Edit (or create) ``/etc/ansible/hosts`` and put one or more remote systems in it. Your
public SSH key should be located in ``authorized_keys`` on those systems::
192.0.2.50
aserver.example.org
bserver.example.org
This is an inventory file, which is also explained in greater depth here: :doc:`intro_inventory`.
We'll assume you are using SSH keys for authentication. To set up SSH agent to avoid retyping passwords, you can
do:
.. code-block:: bash
$ ssh-agent bash
$ ssh-add ~/.ssh/id_rsa
(Depending on your setup, you may wish to use Ansible's ``--private-key`` option to specify a pem file instead)
Now ping all your nodes:
.. code-block:: bash
$ ansible all -m ping
Ansible will attempt to remote connect to the machines using your current
user name, just like SSH would. To override the remote user name, just use the '-u' parameter.
If you would like to access sudo mode, there are also flags to do that:
.. code-block:: bash
# as bruce
$ ansible all -m ping -u bruce
# as bruce, sudoing to root
$ ansible all -m ping -u bruce --sudo
# as bruce, sudoing to batman
$ ansible all -m ping -u bruce --sudo --sudo-user batman
# With latest version of ansible `sudo` is deprecated so use become
# as bruce, sudoing to root
$ ansible all -m ping -u bruce -b
# as bruce, sudoing to batman
$ ansible all -m ping -u bruce -b --become-user batman
(The sudo implementation is changeable in Ansible's configuration file if you happen to want to use a sudo
replacement. Flags passed to sudo (like -H) can also be set there.)
Now run a live command on all of your nodes:
.. code-block:: bash
$ ansible all -a "/bin/echo hello"
Congratulations! You've just contacted your nodes with Ansible. It's
soon going to be time to: read about some more real-world cases in :doc:`intro_adhoc`,
explore what you can do with different modules, and to learn about the Ansible
:doc:`playbooks` language. Ansible is not just about running commands, it
also has powerful configuration management and deployment features. There's more to
explore, but you already have a fully working infrastructure!
.. _a_note_about_host_key_checking:
Host Key Checking
`````````````````
Ansible 1.2.1 and later have host key checking enabled by default.
If a host is reinstalled and has a different key in 'known_hosts', this will result in an error message until corrected. If a host is not initially in 'known_hosts' this will result in prompting for confirmation of the key, which results in an interactive experience if using Ansible, from say, cron. You might not want this.
If you understand the implications and wish to disable this behavior, you can do so by editing ``/etc/ansible/ansible.cfg`` or ``~/.ansible.cfg``::
[defaults]
host_key_checking = False
Alternatively this can be set by an environment variable:
.. code-block:: bash
$ export ANSIBLE_HOST_KEY_CHECKING=False
Also note that host key checking in paramiko mode is reasonably slow, therefore switching to 'ssh' is also recommended when using this feature.
.. _a_note_about_logging:
Ansible will log some information about module arguments on the remote system in the remote syslog, unless a task or play is marked with a "no_log: True" attribute. This is explained later.
To enable basic logging on the control machine see :doc:`intro_configuration` document and set the 'log_path' configuration file setting. Enterprise users may also be interested in :doc:`tower`. Tower provides a very robust database logging feature where it is possible to drill down and see history based on hosts, projects, and particular inventories over time -- explorable both graphically and through a REST API.
.. seealso::
:doc:`intro_inventory`
More information about inventory
:doc:`intro_adhoc`
Examples of basic commands
:doc:`playbooks`
Learning Ansible's configuration management language
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Installation
============
.. contents:: Topics
.. _getting_ansible:
Getting Ansible
```````````````
You may also wish to follow the `GitHub project <https://github.com/ansible/ansible>`_ if
you have a GitHub account. This is also where we keep the issue tracker for sharing
bugs and feature ideas.
.. _what_will_be_installed:
Basics / What Will Be Installed
```````````````````````````````
Ansible by default manages machines over the SSH protocol.
Once Ansible is installed, it will not add a database, and there will be no daemons to start or keep running. You only need to install it on one machine (which could easily be a laptop) and it can manage an entire fleet of remote machines from that central point. When Ansible manages remote machines, it does not leave software installed or running on them, so there's no real question about how to upgrade Ansible when moving to a new version.
.. _what_version:
What Version To Pick?
`````````````````````
Because it runs so easily from source and does not require any installation of software on remote
machines, many users will actually track the development version.
Ansible's release cycles are usually about four months long. Due to this short release cycle,
minor bugs will generally be fixed in the next release versus maintaining backports on the stable branch.
Major bugs will still have maintenance releases when needed, though these are infrequent.
If you are wishing to run the latest released version of Ansible and you are running Red Hat Enterprise Linux (TM), CentOS, Fedora, Debian, or Ubuntu, we recommend using the OS package manager.
For other installation options, we recommend installing via "pip", which is the Python package manager, though other options are also available.
If you wish to track the development release to use and test the latest features, we will share
information about running from source. It's not necessary to install the program to run from source.
.. _control_machine_requirements:
Control Machine Requirements
````````````````````````````
Currently Ansible can be run from any machine with Python 2.6 or 2.7 installed (Windows isn't supported for the control machine).
.. note::
Ansible 2.2 introduces a tech preview of support for Python 3. For more information, see `Python 3 Support <http://docs.ansible.com/ansible/python_3_support.html>`_.
This includes Red Hat, Debian, CentOS, OS X, any of the BSDs, and so on.
.. note::
As of version 2.0, Ansible uses a few more file handles to manage its forks. Mac OS X by default is configured for a small amount of file handles, so if you want to use 15 or more forks you'll need to raise the ulimit with ``sudo launchctl limit maxfiles unlimited``. This command can also fix any "Too many open files" error.
.. warning::
Please note that some modules and plugins have additional requirements. For modules these need to be satisfied on the 'target' machine and should be listed in the module specific docs.
.. _managed_node_requirements:
Managed Node Requirements
`````````````````````````
On the managed nodes, you need a way to communicate, which is normally ssh. By default this uses sftp. If that's not available, you can switch to scp in ansible.cfg.
You also need Python 2.4 or later. If you are running less than Python 2.5 on the remotes, you will also need:
* ``python-simplejson``
.. note::
Ansible's "raw" module (for executing commands in a quick and dirty
way) and the script module don't even need that. So technically, you can use
Ansible to install python-simplejson using the raw module, which
then allows you to use everything else. (That's jumping ahead
though.)
.. note::
If you have SELinux enabled on remote nodes, you will also want to install
libselinux-python on them before using any copy/file/template related functions in
Ansible. You can of course still use the yum module in Ansible to install this package on
remote systems that do not have it.
.. note::
Ansible 2.2 introduces a tech preview of support for Python 3. For more information, see `Python 3 Support <http://docs.ansible.com/ansible/python_3_support.html>`_.
By default, Ansible uses Python 2 in order to maintain compatibility with older distributions
such as RHEL 5 and RHEL 6. However, some Linux distributions (Gentoo, Arch) may not have a
Python 2.X interpreter installed by default. On those systems, you should install one, and set
the 'ansible_python_interpreter' variable in inventory (see :doc:`intro_inventory`) to point at your 2.X Python. Distributions
like Red Hat Enterprise Linux, CentOS, Fedora, and Ubuntu all have a 2.X interpreter installed
by default and this does not apply to those distributions. This is also true of nearly all
Unix systems.
If you need to bootstrap these remote systems by installing Python 2.X,
using the 'raw' module will be able to do it remotely. For example,
``ansible myhost --sudo -m raw -a "yum install -y python2 python-simplejson"``
would install Python 2.X and the simplejson module needed to run ansible and its modules.
.. _installing_the_control_machine:
Installing the Control Machine
``````````````````````````````
.. _from_yum:
Latest Release Via Yum
++++++++++++++++++++++
RPMs are available from yum for `EPEL
<http://fedoraproject.org/wiki/EPEL>`_ 6, 7, and currently supported
Fedora distributions.
Ansible itself can manage earlier operating
systems that contain Python 2.4 or higher (so also EL5).
Fedora users can install Ansible directly, though if you are using RHEL or CentOS and have not already done so, `configure EPEL <http://fedoraproject.org/wiki/EPEL>`_
.. code-block:: bash
# install the epel-release RPM if needed on CentOS, RHEL, or Scientific Linux
$ sudo yum install ansible
You can also build an RPM yourself. From the root of a checkout or tarball, use the ``make rpm`` command to build an RPM you can distribute and install. Make sure you have ``rpm-build``, ``make``, ``asciidoc``, ``git``, ``python-setuptools`` and ``python2-devel`` installed.
.. code-block:: bash
$ git clone git://github.com/ansible/ansible.git --recursive
$ cd ./ansible
$ make rpm
$ sudo rpm -Uvh ./rpm-build/ansible-*.noarch.rpm
.. _from_apt:
Latest Releases Via Apt (Ubuntu)
++++++++++++++++++++++++++++++++
Ubuntu builds are available `in a PPA here <https://launchpad.net/~ansible/+archive/ansible>`_.
To configure the PPA on your machine and install ansible run these commands:
.. code-block:: bash
$ sudo apt-get install software-properties-common
$ sudo apt-add-repository ppa:ansible/ansible
$ sudo apt-get update
$ sudo apt-get install ansible
.. note:: For the older version 1.9 we use this ppa:ansible/ansible-1.9
.. note:: On older Ubuntu distributions, "software-properties-common" is called "python-software-properties".
Debian/Ubuntu packages can also be built from the source checkout, run:
.. code-block:: bash
$ make deb
You may also wish to run from source to get the latest, which is covered above.
Latest Releases Via Apt (Debian)
++++++++++++++++++++++++++++++++
Debian users may leverage the same source as the Ubuntu PPA.
Add the following line to /etc/apt/sources.list:
.. code-block:: bash
deb http://ppa.launchpad.net/ansible/ansible/ubuntu trusty main
Then run these commands:
.. code-block:: bash
$ sudo apt-get update
$ sudo apt-get install ansible
.. note:: This method has been verified with the Trusty sources in Debian Jessie and Stretch but may not be supported in earlier versions.
Latest Releases Via Portage (Gentoo)
++++++++++++++++++++++++++++++++++++
.. code-block:: bash
$ emerge -av app-admin/ansible
To install the newest version, you may need to unmask the ansible package prior to emerging:
.. code-block:: bash
$ echo 'app-admin/ansible' >> /etc/portage/package.accept_keywords
.. note::
If you have Python 3 as a default Python slot on your Gentoo nodes (default setting), then you
must set ``ansible_python_interpreter = /usr/bin/python2`` in your group or inventory variables.
Latest Releases Via pkg (FreeBSD)
+++++++++++++++++++++++++++++++++
.. code-block:: bash
$ sudo pkg install ansible
You may also wish to install from ports, run:
.. code-block:: bash
$ sudo make -C /usr/ports/sysutils/ansible install
.. _on_macos:
Latest Releases on Mac OSX
++++++++++++++++++++++++++++++++++++++
The preferred way to install ansible on a Mac is via pip.
The instructions can be found in `Latest Releases Via Pip`_ section.
.. _from_pkgutil:
Latest Releases Via OpenCSW (Solaris)
+++++++++++++++++++++++++++++++++++++
Ansible is available for Solaris as `SysV package from OpenCSW <https://www.opencsw.org/packages/ansible/>`_.
.. code-block:: bash
# pkgadd -d http://get.opencsw.org/now
# /opt/csw/bin/pkgutil -i ansible
.. _from_pacman:
Latest Releases Via Pacman (Arch Linux)
+++++++++++++++++++++++++++++++++++++++
Ansible is available in the Community repository::
$ pacman -S ansible
The AUR has a PKGBUILD for pulling directly from Github called `ansible-git <https://aur.archlinux.org/packages/ansible-git>`_.
Also see the `Ansible <https://wiki.archlinux.org/index.php/Ansible>`_ page on the ArchWiki.
.. note::
If you have Python 3 as a default Python slot on your Arch nodes (default setting), then you
must set ``ansible_python_interpreter = /usr/bin/python2`` in your group or inventory variables.
.. _from_pip:
Latest Releases Via Pip
+++++++++++++++++++++++
Ansible can be installed via "pip", the Python package manager. If 'pip' isn't already available in
your version of Python, you can get pip by::
$ sudo easy_install pip
Then install Ansible with [1]_::
$ sudo pip install ansible
Or if you are looking for the latest development version::
pip install git+git://github.com/ansible/ansible.git@devel
If you are installing on OS X Mavericks, you may encounter some noise from your compiler. A workaround is to do the following::
$ sudo CFLAGS=-Qunused-arguments CPPFLAGS=-Qunused-arguments pip install ansible
Readers that use virtualenv can also install Ansible under virtualenv, though we'd recommend to not worry about it and just install Ansible globally. Do not use easy_install to install ansible directly.
.. _tagged_releases:
Tarballs of Tagged Releases
+++++++++++++++++++++++++++
Packaging Ansible or wanting to build a local package yourself, but don't want to do a git checkout? Tarballs of releases are available on the `Ansible downloads <http://releases.ansible.com/ansible>`_ page.
These releases are also tagged in the `git repository <https://github.com/ansible/ansible/releases>`_ with the release version.
.. _from_source:
Running From Source
+++++++++++++++++++
Ansible is easy to run from a checkout - root permissions are not required
to use it and there is no software to actually install. No daemons
or database setup are required. Because of this, many users in our community use the
development version of Ansible all of the time so they can take advantage of new features
when they are implemented and easily contribute to the project. Because there is
nothing to install, following the development version is significantly easier than most
open source projects.
.. note::
If you are intending to use Tower as the Control Machine, do not use a source install. Please use OS package manager (like ``apt/yum``) or ``pip`` to install a stable version.
To install from source.
.. code-block:: bash
$ git clone git://github.com/ansible/ansible.git --recursive
$ cd ./ansible
Using Bash:
.. code-block:: bash
$ source ./hacking/env-setup
Using Fish::
$ . ./hacking/env-setup.fish
If you want to suppress spurious warnings/errors, use::
$ source ./hacking/env-setup -q
If you don't have pip installed in your version of Python, install pip::
$ sudo easy_install pip
Ansible also uses the following Python modules that need to be installed [1]_::
$ sudo pip install paramiko PyYAML Jinja2 httplib2 six
Note when updating ansible, be sure to not only update the source tree, but also the "submodules" in git
which point at Ansible's own modules (not the same kind of modules, alas).
.. code-block:: bash
$ git pull --rebase
$ git submodule update --init --recursive
Once running the env-setup script you'll be running from checkout and the default inventory file
will be /etc/ansible/hosts. You can optionally specify an inventory file (see :doc:`intro_inventory`)
other than /etc/ansible/hosts:
.. code-block:: bash
$ echo "127.0.0.1" > ~/ansible_hosts
$ export ANSIBLE_INVENTORY=~/ansible_hosts
.. note::
ANSIBLE_INVENTORY is available starting at 1.9 and substitutes the deprecated ANSIBLE_HOSTS
You can read more about the inventory file in later parts of the manual.
Now let's test things with a ping command:
.. code-block:: bash
$ ansible all -m ping --ask-pass
You can also use "sudo make install".
.. seealso::
:doc:`intro_adhoc`
Examples of basic commands
:doc:`playbooks`
Learning ansible's configuration management language
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel
.. [1] If you have issues with the "pycrypto" package install on Mac OSX, which is included as a dependency for paramiko, then you may need to try "CC=clang sudo -E pip install pycrypto".

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.. _inventory:
Inventory
=========
.. contents:: Topics
Ansible works against multiple systems in your infrastructure at the
same time. It does this by selecting portions of systems listed in
Ansible's inventory file, which defaults to being saved in
the location ``/etc/ansible/hosts``. You can specify a different inventory file using the
``-i <path>`` option on the command line.
Not only is this inventory configurable, but you can also use
multiple inventory files at the same time (explained below) and also
pull inventory from dynamic or cloud sources, as described in :doc:`intro_dynamic_inventory`.
.. _inventoryformat:
Hosts and Groups
++++++++++++++++
The format for ``/etc/ansible/hosts`` is an INI-like format and looks like this::
mail.example.com
[webservers]
foo.example.com
bar.example.com
[dbservers]
one.example.com
two.example.com
three.example.com
The headings in brackets are group names, which are used in classifying systems
and deciding what systems you are controlling at what times and for what purpose.
It is ok to put systems in more than one group, for instance a server could be both a webserver and a dbserver.
If you do, note that variables will come from all of the groups they are a member of. Variable precedence is detailed in a later chapter.
If you have hosts that run on non-standard SSH ports you can put the port number
after the hostname with a colon. Ports listed in your SSH config file won't be used with the `paramiko`
connection but will be used with the `openssh` connection.
To make things explicit, it is suggested that you set them if things are not running on the default port::
badwolf.example.com:5309
Suppose you have just static IPs and want to set up some aliases that live in your host file, or you are connecting through tunnels. You can also describe hosts like this::
jumper ansible_port=5555 ansible_host=192.0.2.50
In the above example, trying to ansible against the host alias "jumper" (which may not even be a real hostname) will contact 192.0.2.50 on port 5555. Note that this is using a feature of the inventory file to define some special variables. Generally speaking this is not the best
way to define variables that describe your system policy, but we'll share suggestions on doing this later. We're just getting started.
Adding a lot of hosts? If you have a lot of hosts following similar patterns you can do this rather than listing each hostname::
[webservers]
www[01:50].example.com
For numeric patterns, leading zeros can be included or removed, as desired. Ranges are inclusive. You can also define alphabetic ranges::
[databases]
db-[a:f].example.com
.. include:: ../rst_common/ansible_ssh_changes_note.rst
You can also select the connection type and user on a per host basis:
::
[targets]
localhost ansible_connection=local
other1.example.com ansible_connection=ssh ansible_user=mpdehaan
other2.example.com ansible_connection=ssh ansible_user=mdehaan
As mentioned above, setting these in the inventory file is only a shorthand, and we'll discuss how to store them in individual files
in the 'host_vars' directory a bit later on.
.. _host_variables:
Host Variables
++++++++++++++
As alluded to above, it is easy to assign variables to hosts that will be used later in playbooks::
[atlanta]
host1 http_port=80 maxRequestsPerChild=808
host2 http_port=303 maxRequestsPerChild=909
.. _group_variables:
Group Variables
+++++++++++++++
Variables can also be applied to an entire group at once::
[atlanta]
host1
host2
[atlanta:vars]
ntp_server=ntp.atlanta.example.com
proxy=proxy.atlanta.example.com
.. _subgroups:
Groups of Groups, and Group Variables
+++++++++++++++++++++++++++++++++++++
It is also possible to make groups of groups using the ``:children`` suffix. Just like above, you can apply variables using ``:vars``::
[atlanta]
host1
host2
[raleigh]
host2
host3
[southeast:children]
atlanta
raleigh
[southeast:vars]
some_server=foo.southeast.example.com
halon_system_timeout=30
self_destruct_countdown=60
escape_pods=2
[usa:children]
southeast
northeast
southwest
northwest
If you need to store lists or hash data, or prefer to keep host and group specific variables
separate from the inventory file, see the next section.
.. _splitting_out_vars:
Splitting Out Host and Group Specific Data
++++++++++++++++++++++++++++++++++++++++++
The preferred practice in Ansible is actually not to store variables in the main inventory file.
In addition to storing variables directly in the INI file, host
and group variables can be stored in individual files relative to the
inventory file.
These variable files are in YAML format. Valid file extensions include '.yml', '.yaml', '.json',
or no file extension. See :doc:`YAMLSyntax` if you are new to YAML.
Assuming the inventory file path is::
/etc/ansible/hosts
If the host is named 'foosball', and in groups 'raleigh' and 'webservers', variables
in YAML files at the following locations will be made available to the host::
/etc/ansible/group_vars/raleigh # can optionally end in '.yml', '.yaml', or '.json'
/etc/ansible/group_vars/webservers
/etc/ansible/host_vars/foosball
For instance, suppose you have hosts grouped by datacenter, and each datacenter
uses some different servers. The data in the groupfile '/etc/ansible/group_vars/raleigh' for
the 'raleigh' group might look like::
---
ntp_server: acme.example.org
database_server: storage.example.org
It is ok if these files do not exist, as this is an optional feature.
As an advanced use-case, you can create *directories* named after your groups or hosts, and
Ansible will read all the files in these directories. An example with the 'raleigh' group::
/etc/ansible/group_vars/raleigh/db_settings
/etc/ansible/group_vars/raleigh/cluster_settings
All hosts that are in the 'raleigh' group will have the variables defined in these files
available to them. This can be very useful to keep your variables organized when a single
file starts to be too big, or when you want to use :doc:`Ansible Vault<playbooks_vault>` on a part of a group's
variables. Note that this only works on Ansible 1.4 or later.
Tip: In Ansible 1.2 or later the ``group_vars/`` and ``host_vars/`` directories can exist in
the playbook directory OR the inventory directory. If both paths exist, variables in the playbook
directory will override variables set in the inventory directory.
Tip: Keeping your inventory file and variables in a git repo (or other version control)
is an excellent way to track changes to your inventory and host variables.
.. _behavioral_parameters:
List of Behavioral Inventory Parameters
+++++++++++++++++++++++++++++++++++++++
As alluded to above, setting the following variables controls how ansible interacts with remote hosts.
Host connection:
ansible_connection
Connection type to the host. This can be the name of any of ansible's connection plugins. SSH protocol types are ``smart``, ``ssh`` or ``paramiko``. The default is smart. Non-SSH based types are described in the next section.
.. include:: ../rst_common/ansible_ssh_changes_note.rst
SSH connection:
ansible_host
The name of the host to connect to, if different from the alias you wish to give to it.
ansible_port
The ssh port number, if not 22
ansible_user
The default ssh user name to use.
ansible_ssh_pass
The ssh password to use (never store this variable in plain text; always use a vault. See :ref:`best_practices_for_variables_and_vaults`)
ansible_ssh_private_key_file
Private key file used by ssh. Useful if using multiple keys and you don't want to use SSH agent.
ansible_ssh_common_args
This setting is always appended to the default command line for :command:`sftp`, :command:`scp`,
and :command:`ssh`. Useful to configure a ``ProxyCommand`` for a certain host (or
group).
ansible_sftp_extra_args
This setting is always appended to the default :command:`sftp` command line.
ansible_scp_extra_args
This setting is always appended to the default :command:`scp` command line.
ansible_ssh_extra_args
This setting is always appended to the default :command:`ssh` command line.
ansible_ssh_pipelining
Determines whether or not to use SSH pipelining. This can override the ``pipelining`` setting in :file:`ansible.cfg`.
.. versionadded:: 2.2
ansible_ssh_executable
This setting overrides the default behavior to use the system :command:`ssh`. This can override the ``ssh_executable`` setting in :file:`ansible.cfg`.
Privilege escalation (see :doc:`Ansible Privilege Escalation<become>` for further details):
ansible_become
Equivalent to ``ansible_sudo`` or ``ansible_su``, allows to force privilege escalation
ansible_become_method
Allows to set privilege escalation method
ansible_become_user
Equivalent to ``ansible_sudo_user`` or ``ansible_su_user``, allows to set the user you become through privilege escalation
ansible_become_pass
Equivalent to ``ansible_sudo_pass`` or ``ansible_su_pass``, allows you to set the privilege escalation password (never store this variable in plain text; always use a vault. See :ref:`best_practices_for_variables_and_vaults`)
Remote host environment parameters:
ansible_shell_type
The shell type of the target system. You should not use this setting unless you have set the ``ansible_shell_executable`` to a non-Bourne (sh) compatible shell.
By default commands are formatted using ``sh``-style syntax.
Setting this to ``csh`` or ``fish`` will cause commands executed on target systems to follow those shell's syntax instead.
ansible_python_interpreter
The target host python path. This is useful for systems with more
than one Python or not located at :command:`/usr/bin/python` such as \*BSD, or where :command:`/usr/bin/python`
is not a 2.X series Python. We do not use the :command:`/usr/bin/env` mechanism as that requires the remote user's
path to be set right and also assumes the :program:`python` executable is named python, where the executable might
be named something like :program:`python2.6`.
ansible_*_interpreter
Works for anything such as ruby or perl and works just like ``ansible_python_interpreter``.
This replaces shebang of modules which will run on that host.
.. versionadded:: 2.1
ansible_shell_executable
This sets the shell the ansible controller will use on the target machine,
overrides ``executable`` in :file:`ansible.cfg` which defaults to
:command:`/bin/sh`. You should really only change it if is not possible
to use :command:`/bin/sh` (i.e. :command:`/bin/sh` is not installed on the target
machine or cannot be run from sudo.).
Examples from a host file::
some_host ansible_port=2222 ansible_user=manager
aws_host ansible_ssh_private_key_file=/home/example/.ssh/aws.pem
freebsd_host ansible_python_interpreter=/usr/local/bin/python
ruby_module_host ansible_ruby_interpreter=/usr/bin/ruby.1.9.3
Non-SSH connection types
++++++++++++++++++++++++
As stated in the previous section, Ansible executes playbooks over SSH but it is not limited to this connection type.
With the host specific parameter ``ansible_connection=<connector>``, the connection type can be changed.
The following non-SSH based connectors are available:
**local**
This connector can be used to deploy the playbook to the control machine itself.
**docker**
This connector deploys the playbook directly into Docker containers using the local Docker client. The following parameters are processed by this connector:
ansible_host
The name of the Docker container to connect to.
ansible_user
The user name to operate within the container. The user must exist inside the container.
ansible_become
If set to ``true`` the ``become_user`` will be used to operate within the container.
ansible_docker_extra_args
Could be a string with any additional arguments understood by Docker, which are not command specific. This parameter is mainly used to configure a remote Docker daemon to use.
Here is an example of how to instantly deploy to created containers::
- name: create jenkins container
docker:
name: my_jenkins
image: jenkins
- name: add container to inventory
add_host:
name: my_jenkins
ansible_connection: docker
ansible_docker_extra_args: "--tlsverify --tlscacert=/path/to/ca.pem --tlscert=/path/to/client-cert.pem --tlskey=/path/to/client-key.pem -H=tcp://myserver.net:4243"
ansible_user: jenkins
changed_when: false
- name: create directory for ssh keys
delegate_to: my_jenkins
file:
path: "/var/jenkins_home/.ssh/jupiter"
state: directory
.. seealso::
:doc:`intro_dynamic_inventory`
Pulling inventory from dynamic sources, such as cloud providers
:doc:`intro_adhoc`
Examples of basic commands
:doc:`playbooks`
Learning Ansibles configuration, deployment, and orchestration language.
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Networking Support
==================
.. contents:: Topics
.. _working_with_networking_devices:
Working with Networking Devices
```````````````````````````````
Starting with Ansible version 2.1, you can now use the familiar Ansible models of playbook authoring and module development to manage heterogenous networking devices. Ansible supports a growing number of network devices using both CLI over SSH and API (when available) transports.
.. _networking_installation:
Network Automation Installation
```````````````````````````````
* Install the `latest Ansible network release <http://docs.ansible.com/ansible/intro_installation.html>`_.
* Get the `playbooks for testing <https://github.com/ansible/test-network-modules>`_ Ansible core network modules.
.. _networking_module_index:
Available Networking Modules
````````````````````````````
Most standard Ansible modules are designed to work with Linux/Unix or Windows machines and will not work with networking devices. Some modules (including "slurp", "raw", and "setup") are platform-agnostic and will work with networking devices.
To see what modules are available for networking devices, please browse the `"networking" section of the Ansible module index <http://docs.ansible.com/ansible/list_of_network_modules.html#>`_.
.. _understanding_provider_arguments:
Connecting to Networking Devices
````````````````````````````````
All core networking modules implement a *provider* argument, which is a collection of arguments used to define the characteristics of how to connect to the device. This section will assist in understanding how the provider argument is used.
Each core network module supports an underlying operating system and transport. The operating system is a one-to-one match with the module, and the transport maintains a one-to-many relationship to the operating system as appropriate. Some network operating systems only have a single transport option.
Each core network module supports some basic arguments for configuring the transport:
* host - defines the hostname or IP address of the remote host
* port - defines the port to connect to
* username - defines the username to use to authenticate the connection
* password - defines the password to use to authenticate the connection
* transport - defines the type of connection transport to build
* authorize - enables privilege escalation for devices that require it
* auth_pass - defines the password, if needed, for privilege escalation
Individual modules can set defaults for these arguments to common values that match device default configuration settings. For instance, the default value for transport is universally 'cli'. Some modules support other values such as EOS (eapi) and NXOS (nxapi), while some only support 'cli'. All arguments are fully documented for each module.
By allowing individual tasks to set the transport arguments independently, modules that use different transport mechanisms and authentication credentials can be combined as necessary.
One downside to this approach is that every task needs to include the required arguments. This is where the provider argument comes into play. The provider argument accepts keyword arguments and passes them through to the task to assign connection and authentication parameters.
The following two config modules are essentially identical (using nxos_config) as an example but it applies to all core networking modules::
---
nxos_config:
src: config.j2
host: "{{ inventory_hostname }}"
username: "{{ ansible_ssh_user }}"
password: "{{ ansible_ssh_pass }}"
transport: cli
---
vars:
cli:
host: "{{ inventory_hostname }}"
username: "{{ ansible_ssh_user }}"
password: "{{ ansible_ssh_pass }} "
transport: cli
nxos_config:
src: config.j2
provider: "{{ cli }}"
Given the above two examples that are equivalent, the arguments can also be used to establish precedence and defaults. Consider the following example::
---
vars:
cli:
host: "{{ inventory_hostname }}"
username: operator
password: secret
transport: cli
tasks:
- nxos_config:
src: config.j2
provider: "{{ cli }}"
username: admin
password: admin
In this example, the values of admin for username and admin for password will override the values of operator in cli['username'] and secret in cli['password'])
This is true for all values in the provider including transport. So you could have a singular task that is now supported over CLI or NXAPI (assuming the configuration is value). ::
---
vars:
cli:
host: "{{ inventory_hostname }}"
username: operator
password: secret
transport: cli
tasks:
- nxos_config:
src: config.j2
provider: "{{ cli }}"
transport: nxapi
If all values are provided via the provider argument, the rules for requirements are still honored for the module. For instance, take the following scenario::
---
vars:
conn:
password: cisco_pass
transport: cli
tasks:
- nxos_config:
src: config.j2
provider: "{{ conn }}"
Running the above task will cause an error to be generated with a message that required parameters are missing. ::
"msg": "missing required arguments: username,host"
Overall, this provides a very granular level of control over how credentials are used with modules. It provides the playbook designer maximum control for changing context during a playbook run as needed.
.. _networking_environment_variables:
Networking Environment Variables
````````````````````````````````
The following environment variables are available to Ansible networking modules:
username ANSIBLE_NET_USERNAME
password ANSIBLE_NET_PASSWORD
ssh_keyfile ANSIBLE_NET_SSH_KEYFILE
authorize ANSIBLE_NET_AUTHORIZE
auth_pass ANSIBLE_NET_AUTH_PASS
Variables are evaulated in the following order, listed from lowest to highest priority:
* Default
* Environment
* Provider
* Task arguments
.. _networking_module_conditionals:
Conditionals in Networking Modules
``````````````````````````````````
Ansible allows you to use conditionals to control the flow of your playbooks. Ansible networking command modules use the following unique conditional statements.
* eq - Equal
* neq - Not equal
* gt - Greater than
* ge - Greater than or equal
* lt - Less than
* le - Less than or equal
* contains - Object contains specified item
Conditional statements evalute the results from the commands that are
executed remotely on the device. Once the task executes the command
set, the waitfor argument can be used to evalute the results before
returning control to the Ansible playbook.
For example::
---
- name: wait for interface to be admin enabled
eos_command:
commands:
- show interface Ethernet4 | json
waitfor:
- "result[0].interfaces.Ethernet4.interfaceStatus eq connected"
In the above example task, the command :code:`show interface Ethernet4 | json`
is executed on the remote device and the results are evaluated. If
the path
:code:`(result[0].interfaces.Ethernet4.interfaceStatus)` is not equal to
"connected", then the command is retried. This process continues
until either the condition is satisfied or the number of retries has
expired (by default, this is 10 retries at 1 second intervals).
The commands module can also evaluate more than one set of command
results in an interface. For instance::
---
- name: wait for interfaces to be admin enabled
eos_command:
commands:
- show interface Ethernet4 | json
- show interface Ethernet5 | json
waitfor:
- "result[0].interfaces.Ethernet4.interfaceStatus eq connected"
- "result[1].interfaces.Ethernet4.interfaceStatus eq connected"
In the above example, two commands are executed on the
remote device, and the results are evaluated. By specifying the result
index value (0 or 1), the correct result output is checked against the
conditional.
The waitfor argument must always start with result and then the
command index in [], where 0 is the first command in the commands list,
1 is the second command, 2 is the third and so on.

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Patterns
++++++++
.. contents:: Topics
Patterns in Ansible are how we decide which hosts to manage. This can mean what hosts to communicate with, but in terms
of :doc:`playbooks` it actually means what hosts to apply a particular configuration or IT process to.
We'll go over how to use the command line in :doc:`intro_adhoc` section, however, basically it looks like this::
ansible <pattern_goes_here> -m <module_name> -a <arguments>
Such as::
ansible webservers -m service -a "name=httpd state=restarted"
A pattern usually refers to a set of groups (which are sets of hosts) -- in the above case, machines in the "webservers" group.
Anyway, to use Ansible, you'll first need to know how to tell Ansible which hosts in your inventory to talk to.
This is done by designating particular host names or groups of hosts.
The following patterns are equivalent and target all hosts in the inventory::
all
*
It is also possible to address a specific host or set of hosts by name::
one.example.com
one.example.com:two.example.com
192.0.2.50
192.0.2.*
The following patterns address one or more groups. Groups separated by a colon indicate an "OR" configuration.
This means the host may be in either one group or the other::
webservers
webservers:dbservers
You can exclude groups as well, for instance, all machines must be in the group webservers but not in the group phoenix::
webservers:!phoenix
You can also specify the intersection of two groups. This would mean the hosts must be in the group webservers and
the host must also be in the group staging::
webservers:&staging
You can do combinations::
webservers:dbservers:&staging:!phoenix
The above configuration means "all machines in the groups 'webservers' and 'dbservers' are to be managed if they are in
the group 'staging' also, but the machines are not to be managed if they are in the group 'phoenix' ... whew!
You can also use variables if you want to pass some group specifiers via the "-e" argument to ansible-playbook, but this
is uncommonly used::
webservers:!{{excluded}}:&{{required}}
You also don't have to manage by strictly defined groups. Individual host names, IPs and groups, can also be referenced using
wildcards::
*.example.com
*.com
It's also ok to mix wildcard patterns and groups at the same time::
one*.com:dbservers
You can select a host or subset of hosts from a group by their position. For example, given the following group::
[webservers]
cobweb
webbing
weber
You can refer to hosts within the group by adding a subscript to the group name::
webservers[0] # == cobweb
webservers[-1] # == weber
webservers[0:1] # == webservers[0],webservers[1]
# == cobweb,webbing
webservers[1:] # == webbing,weber
Most people don't specify patterns as regular expressions, but you can. Just start the pattern with a '~'::
~(web|db).*\.example\.com
While we're jumping a bit ahead, additionally, you can add an exclusion criteria just by supplying the ``--limit`` flag to /usr/bin/ansible or /usr/bin/ansible-playbook::
ansible-playbook site.yml --limit datacenter2
And if you want to read the list of hosts from a file, prefix the file name with '@'. Since Ansible 1.2::
ansible-playbook site.yml --limit @retry_hosts.txt
Easy enough. See :doc:`intro_adhoc` and then :doc:`playbooks` for how to apply this knowledge.
.. note:: With the exception of version 1.9, you can use ',' instead of ':' as a host list separator. The ',' is preferred specially when dealing with ranges and ipv6.
.. note:: As of 2.0 the ';' is deprecated as a host list separator.
.. seealso::
:doc:`intro_adhoc`
Examples of basic commands
:doc:`playbooks`
Learning ansible's configuration management language
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Windows Support
===============
.. contents:: Topics
.. _windows_how_does_it_work:
Windows: How Does It Work
`````````````````````````
As you may have already read, Ansible manages Linux/Unix machines using SSH by default.
Starting in version 1.7, Ansible also contains support for managing Windows machines. This uses
native PowerShell remoting, rather than SSH.
Ansible will still be run from a Linux control machine, and uses the "winrm" Python module to talk to remote hosts.
No additional software needs to be installed on the remote machines for Ansible to manage them, it still maintains the agentless properties that make it popular on Linux/Unix.
Note that it is expected you have a basic understanding of Ansible prior to jumping into this section, so if you haven't written a Linux playbook first, it might be worthwhile to dig in there first.
.. _windows_installing:
Installing on the Control Machine
`````````````````````````````````
On a Linux control machine::
pip install "pywinrm>=0.1.1"
Note:: on distributions with multiple python versions, use pip2 or pip2.x, where x matches the python minor version Ansible is running under.
Active Directory Support
++++++++++++++++++++++++
If you wish to connect to domain accounts published through Active Directory (as opposed to local accounts created on the remote host), you will need to install the "python-kerberos" module on the Ansible control host (and the MIT krb5 libraries it depends on). The Ansible control host also requires a properly configured computer account in Active Directory.
Installing python-kerberos dependencies
---------------------------------------
.. code-block:: bash
# Via Yum
yum -y install python-devel krb5-devel krb5-libs krb5-workstation
# Via Apt (Ubuntu)
sudo apt-get install python-dev libkrb5-dev krb5-user
# Via Portage (Gentoo)
emerge -av app-crypt/mit-krb5
emerge -av dev-python/setuptools
# Via pkg (FreeBSD)
sudo pkg install security/krb5
# Via OpenCSW (Solaris)
pkgadd -d http://get.opencsw.org/now
/opt/csw/bin/pkgutil -U
/opt/csw/bin/pkgutil -y -i libkrb5_3
# Via Pacman (Arch Linux)
pacman -S krb5
Installing python-kerberos
--------------------------
Once you've installed the necessary dependencies, the python-kerberos wrapper can be installed via pip:
.. code-block:: bash
pip install kerberos requests_kerberos
Kerberos is installed and configured by default on OS X and many Linux distributions. If your control machine has not already done this for you, you will need to.
Configuring Kerberos
--------------------
Edit your /etc/krb5.conf (which should be installed as a result of installing packages above) and add the following information for each domain you need to connect to:
In the section that starts with
.. code-block:: bash
[realms]
add the full domain name and the fully qualified domain names of your primary and secondary Active Directory domain controllers. It should look something like this:
.. code-block:: bash
[realms]
MY.DOMAIN.COM = {
kdc = domain-controller1.my.domain.com
kdc = domain-controller2.my.domain.com
}
and in the [domain_realm] section add a line like the following for each domain you want to access:
.. code-block:: bash
[domain_realm]
.my.domain.com = MY.DOMAIN.COM
You may wish to configure other settings here, such as the default domain.
Testing a kerberos connection
-----------------------------
If you have installed krb5-workstation (yum) or krb5-user (apt-get) you can use the following command to test that you can be authorised by your domain controller.
.. code-block:: bash
kinit user@MY.DOMAIN.COM
Note that the domain part has to be fully qualified and must be in upper case.
To see what tickets if any you have acquired, use the command klist
.. code-block:: bash
klist
Troubleshooting kerberos connections
------------------------------------
If you unable to connect using kerberos, check the following:
Ensure that forward and reverse DNS lookups are working properly on your domain.
To test this, ping the windows host you want to control by name then use the ip address returned with nslookup. You should get the same name back from DNS when you use nslookup on the ip address.
If you get different hostnames back than the name you originally pinged, speak to your active directory administrator and get them to check that DNS Scavenging is enabled and that DNS and DHCP are updating each other.
Ensure that the Ansible controller has a properly configured computer account in the domain.
Check your Ansible controller's clock is synchronised with your domain controller. Kerberos is time sensitive and a little clock drift can cause tickets not be granted.
Check you are using the real fully qualified domain name for the domain. Sometimes domains are commonly known to users by aliases. To check this run:
.. code-block:: bash
kinit -C user@MY.DOMAIN.COM
klist
If the domain name returned by klist is different from the domain name you requested, you are requesting using an alias, and you need to update your krb5.conf so you are using the fully qualified domain name, not its alias.
.. _windows_inventory:
Inventory
`````````
Ansible's windows support relies on a few standard variables to indicate the username, password, and connection type (windows) of the remote hosts. These variables are most easily set up in inventory. This is used instead of SSH-keys or passwords as normally fed into Ansible::
[windows]
winserver1.example.com
winserver2.example.com
.. include:: ../rst_common/ansible_ssh_changes_note.rst
In group_vars/windows.yml, define the following inventory variables::
# it is suggested that these be encrypted with ansible-vault:
# ansible-vault edit group_vars/windows.yml
ansible_user: Administrator
ansible_password: SecretPasswordGoesHere
ansible_port: 5986
ansible_connection: winrm
# The following is necessary for Python 2.7.9+ (or any older Python that has backported SSLContext, eg, Python 2.7.5 on RHEL7) when using default WinRM self-signed certificates:
ansible_winrm_server_cert_validation: ignore
Attention for the older style variables (``ansible_ssh_*``): ansible_ssh_password doesn't exist, should be ansible_ssh_pass.
Although Ansible is mostly an SSH-oriented system, Windows management will not happen over SSH (`yet <http://blogs.msdn.com/b/powershell/archive/2015/06/03/looking-forward-microsoft-support-for-secure-shell-ssh.aspx>`).
If you have installed the ``kerberos`` module and ``ansible_user`` contains ``@`` (e.g. ``username@realm``), Ansible will first attempt Kerberos authentication. *This method uses the principal you are authenticated to Kerberos with on the control machine and not* ``ansible_user``. If that fails, either because you are not signed into Kerberos on the control machine or because the corresponding domain account on the remote host is not available, then Ansible will fall back to "plain" username/password authentication.
When using your playbook, don't forget to specify --ask-vault-pass to provide the password to unlock the file.
Test your configuration like so, by trying to contact your Windows nodes. Note this is not an ICMP ping, but tests the Ansible
communication channel that leverages Windows remoting::
ansible windows [-i inventory] -m win_ping --ask-vault-pass
If you haven't done anything to prep your systems yet, this won't work yet. This is covered in a later
section about how to enable PowerShell remoting - and if necessary - how to upgrade PowerShell to
a version that is 3 or higher.
You'll run this command again later though, to make sure everything is working.
Since 2.0, the following custom inventory variables are also supported for additional configuration of WinRM connections::
* ``ansible_winrm_scheme``: Specify the connection scheme (``http`` or ``https``) to use for the WinRM connection. Ansible uses ``https`` by default unless the port is 5985.
* ``ansible_winrm_path``: Specify an alternate path to the WinRM endpoint. Ansible uses ``/wsman`` by default.
* ``ansible_winrm_realm``: Specify the realm to use for Kerberos authentication. If the username contains ``@``, Ansible will use the part of the username after ``@`` by default.
* ``ansible_winrm_transport``: Specify one or more transports as a comma-separated list. By default, Ansible will use ``kerberos,plaintext`` if the ``kerberos`` module is installed and a realm is defined, otherwise ``plaintext``.
* ``ansible_winrm_server_cert_validation``: Specify the server certificate validation mode (``ignore`` or ``validate``). Ansible defaults to ``validate`` on Python 2.7.9 and higher, which will result in certificate validation errors against the Windows self-signed certificates. Unless verifiable certificates have been configured on the WinRM listeners, this should be set to ``ignore``
* ``ansible_winrm_*``: Any additional keyword arguments supported by ``winrm.Protocol`` may be provided.
.. _windows_system_prep:
Windows System Prep
```````````````````
In order for Ansible to manage your windows machines, you will have to enable and configure PowerShell remoting.
To automate the setup of WinRM, you can run `this PowerShell script <https://github.com/ansible/ansible/blob/devel/examples/scripts/ConfigureRemotingForAnsible.ps1>`_ on the remote machine.
The example script accepts a few arguments which Admins may choose to use to modify the default setup slightly, which might be appropriate in some cases.
Pass the -CertValidityDays option to customize the expiration date of the generated certificate.
powershell.exe -File ConfigureRemotingForAnsible.ps1 -CertValidityDays 100
Pass the -SkipNetworkProfileCheck switch to configure winrm to listen on PUBLIC zone interfaces. (Without this option, the script will fail if any network interface on device is in PUBLIC zone)
powershell.exe -File ConfigureRemotingForAnsible.ps1 -SkipNetworkProfileCheck
Pass the -ForceNewSSLCert switch to force a new SSL certificate to be attached to an already existing winrm listener. (Avoids SSL winrm errors on syspreped Windows images after the CN changes)
powershell.exe -File ConfigureRemotingForAnsible.ps1 -ForceNewSSLCert
.. note::
On Windows 7 and Server 2008 R2 machines, due to a bug in Windows
Management Framework 3.0, it may be necessary to install this
hotfix http://support.microsoft.com/kb/2842230 to avoid receiving
out of memory and stack overflow exceptions. Newly-installed Server 2008
R2 systems which are not fully up to date with windows updates are known
to have this issue.
Windows 8.1 and Server 2012 R2 are not affected by this issue as they
come with Windows Management Framework 4.0.
.. _getting_to_powershell_three_or_higher:
Getting to PowerShell 3.0 or higher
```````````````````````````````````
PowerShell 3.0 or higher is needed for most provided Ansible modules for Windows, and is also required to run the above setup script. Note that PowerShell 3.0 is only supported on Windows 7 SP1, Windows Server 2008 SP1, and later releases of Windows.
Looking at an Ansible checkout, copy the `examples/scripts/upgrade_to_ps3.ps1 <https://github.com/cchurch/ansible/blob/devel/examples/scripts/upgrade_to_ps3.ps1>`_ script onto the remote host and run a PowerShell console as an administrator. You will now be running PowerShell 3 and can try connectivity again using the win_ping technique referenced above.
.. _what_windows_modules_are_available:
What modules are available
``````````````````````````
Most of the Ansible modules in core Ansible are written for a combination of Linux/Unix machines and arbitrary web services, though there are various
Windows-only modules. These are listed in the `"windows" subcategory of the Ansible module index <http://docs.ansible.com/list_of_windows_modules.html>`_.
In addition, the following core modules work with Windows:
assemble
fetch
raw
script
slurp
template
add_host
assert
debug
fail
group_by
include_vars
meta
pause
set_fact
Browse this index to see what is available.
In many cases, it may not be necessary to even write or use an Ansible module.
In particular, the "script" module can be used to run arbitrary PowerShell scripts, allowing Windows administrators familiar with PowerShell a very native way to do things, as in the following playbook::
- hosts: windows
tasks:
- script: foo.ps1 --argument --other-argument
Note:: There are a few other Ansible modules that don't start with "win" that also function with Windows, including "fetch", "slurp", "raw", and "setup" (which is how fact gathering works).
.. _developers_developers_developers:
Developers: Supported modules and how it works
``````````````````````````````````````````````
Developing Ansible modules are covered in a `later section of the documentation <http://docs.ansible.com/developing_modules.html>`_, with a focus on Linux/Unix.
What if you want to write Windows modules for Ansible though?
For Windows, Ansible modules are implemented in PowerShell. Skim those Linux/Unix module development chapters before proceeding. Windows modules in the core and extras repo live in a "windows/" subdir. Custom modules can go directly into the Ansible "library/" directories or those added in ansible.cfg. Documentation lives in a `.py` file with the same name. For example, if a module is named "win_ping", there will be embedded documentation in the "win_ping.py" file, and the actual PowerShell code will live in a "win_ping.ps1" file. Take a look at the sources and this will make more sense.
Modules (ps1 files) should start as follows::
#!powershell
# <license>
# WANT_JSON
# POWERSHELL_COMMON
# code goes here, reading in stdin as JSON and outputting JSON
The above magic is necessary to tell Ansible to mix in some common code and also know how to push modules out. The common code contains some nice wrappers around working with hash data structures and emitting JSON results, and possibly a few more useful things. Regular Ansible has this same concept for reusing Python code - this is just the windows equivalent.
What modules you see in windows/ are just a start. Additional modules may be submitted as pull requests to github.
.. _windows_and_linux_control_machine:
Reminder: You Must Have a Linux Control Machine
```````````````````````````````````````````````
Note running Ansible from a Windows control machine is NOT a goal of the project. Refrain from asking for this feature,
as it limits what technologies, features, and code we can use in the main project in the future. A Linux control machine
will be required to manage Windows hosts.
Cygwin is not supported, so please do not ask questions about Ansible running from Cygwin.
.. _windows_facts:
Windows Facts
`````````````
Just as with Linux/Unix, facts can be gathered for windows hosts, which will return things such as the operating system version. To see what variables are available about a windows host, run the following::
ansible winhost.example.com -m setup
Note that this command invocation is exactly the same as the Linux/Unix equivalent.
.. _windows_playbook_example:
Windows Playbook Examples
`````````````````````````
Look to the list of windows modules for most of what is possible, though also some modules like "raw" and "script" also work on Windows, as do "fetch" and "slurp".
Here is an example of pushing and running a PowerShell script::
- name: test script module
hosts: windows
tasks:
- name: run test script
script: files/test_script.ps1
Running individual commands uses the 'raw' module, as opposed to the shell or command module as is common on Linux/Unix operating systems::
- name: test raw module
hosts: windows
tasks:
- name: run ipconfig
raw: ipconfig
register: ipconfig
- debug: var=ipconfig
Running common DOS commands like 'del", 'move', or 'copy" is unlikely to work on a remote Windows Server using Powershell, but they can work by prefacing the commands with "CMD /C" and enclosing the command in double quotes as in this example::
- name: another raw module example
hosts: windows
tasks:
- name: Move file on remote Windows Server from one location to another
raw: CMD /C "MOVE /Y C:\teststuff\myfile.conf C:\builds\smtp.conf"
You may wind up with a more readable playbook by using the PowerShell equivalents of DOS commands. For example, to achieve the same effect as the example above, you could use::
- name: another raw module example demonstrating powershell one liner
hosts: windows
tasks:
- name: Move file on remote Windows Server from one location to another
raw: Move-Item C:\teststuff\myfile.conf C:\builds\smtp.conf
Bear in mind that using C(raw) will always report "changed", and it is your responsiblity to ensure PowerShell will need to handle idempotency as appropriate (the move examples above are inherently not idempotent), so where possible use (or write) a module.
Here's an example of how to use the win_stat module to test for file existence. Note that the data returned by the win_stat module is slightly different than what is provided by the Linux equivalent::
- name: test stat module
hosts: windows
tasks:
- name: test stat module on file
win_stat: path="C:/Windows/win.ini"
register: stat_file
- debug: var=stat_file
- name: check stat_file result
assert:
that:
- "stat_file.stat.exists"
- "not stat_file.stat.isdir"
- "stat_file.stat.size > 0"
- "stat_file.stat.md5"
Again, recall that the Windows modules are all listed in the Windows category of modules, with the exception that the "raw", "script", "slurp" and "fetch" modules are also available. These modules do not start with a "win" prefix.
.. _windows_contributions:
Windows Contributions
`````````````````````
Windows support in Ansible is still relatively new, and contributions are quite welcome, whether this is in the
form of new modules, tweaks to existing modules, documentation, or something else. Please stop by the ansible-devel mailing list if you would like to get involved and say hi.
.. seealso::
:doc:`developing_modules`
How to write modules
:doc:`playbooks`
Learning Ansible's configuration management language
`List of Windows Modules <http://docs.ansible.com/list_of_windows_modules.html>`_
Windows specific module list, all implemented in PowerShell
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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About Modules
=============
.. toctree::
:maxdepth: 1
modules_intro
modules_core
modules_extra
common_return_values
Ansible ships with a number of modules (called the 'module library')
that can be executed directly on remote hosts or through :doc:`Playbooks <playbooks>`.
Users can also write their own modules. These modules can control system resources,
like services, packages, or files (anything really), or handle executing system commands.
.. seealso::
:doc:`intro_adhoc`
Examples of using modules in /usr/bin/ansible
:doc:`playbooks`
Examples of using modules with /usr/bin/ansible-playbook
:doc:`developing_modules`
How to write your own modules
:doc:`developing_api`
Examples of using modules with the Python API
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Core Modules
------------
These are modules that the core ansible team maintains and will always ship with ansible itself.
They will also receive slightly higher priority for all requests than those in the "extras" repos.
The source of these modules is hosted on GitHub in the `ansible <https://github.com/ansible/ansible/tree/devel/lib/ansible/modules>`_ repo.
If you believe you have found a bug in a core module and are already running the latest stable or development version of Ansible, first look in the `issue tracker at github.com/ansible/ansible <http://github.com/ansible/ansible/issues>`_ to see if a bug has already been filed. If not, we would be grateful if you would file one.
Should you have a question rather than a bug report, inquiries are welcome on the `ansible-project google group <https://groups.google.com/forum/#!forum/ansible-project>`_ or on Ansible's "#ansible" channel, located on irc.freenode.net. Development oriented topics should instead use the similar `ansible-devel google group <https://groups.google.com/forum/#!forum/ansible-devel>`_.
Documentation updates for these modules can also be edited directly in the module itself and by submitting a pull request to the module source code, just look for the "DOCUMENTATION" block in the source tree.

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Extras Modules
--------------
These modules are currently shipped with Ansible, but might be shipped separately in the future. They are also mostly maintained by the community.
Non-core modules are still fully usable, but may receive slightly lower response rates for issues and pull requests.
Popular "extras" modules may be promoted to core modules over time.
The source for these modules is hosted on GitHub in the `ansible <https://github.com/ansible/ansible/tree/devel/lib/ansible/modules>`_ repo.
If you believe you have found a bug in an extras module and are already running the latest stable or development version of Ansible,
first look in the `issue tracker at github.com/ansible/ansible <http://github.com/ansible/ansible/issues>`_
to see if a bug has already been filed. If not, we would be grateful if you could file one.
Should you have a question rather than a bug report, inquiries are welcome on the `ansible-project google group <https://groups.google.com/forum/#!forum/ansible-project>`_
or on Ansible's "#ansible" channel, located on irc.freenode.net.
Development oriented topics should instead use the similar `ansible-devel google group <https://groups.google.com/forum/#!forum/ansible-devel>`_.
Documentation updates for this module can also be edited directly in the module and by submitting a pull request to the module source code, just look for the "DOCUMENTATION" block in the source tree.
For help in developing on modules, should you be so inclined, please read :doc:`community`, :doc:`developing_test_pr` and :doc:`developing_modules`.

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Introduction
============
Modules (also referred to as "task plugins" or "library plugins") are the ones that do
the actual work in ansible, they are what gets executed in each playbook task.
But you can also run a single one using the 'ansible' command.
Let's review how we execute three different modules from the command line::
ansible webservers -m service -a "name=httpd state=started"
ansible webservers -m ping
ansible webservers -m command -a "/sbin/reboot -t now"
Each module supports taking arguments. Nearly all modules take ``key=value``
arguments, space delimited. Some modules take no arguments, and the command/shell modules simply
take the string of the command you want to run.
From playbooks, Ansible modules are executed in a very similar way::
- name: reboot the servers
action: command /sbin/reboot -t now
Which can be abbreviated to::
- name: reboot the servers
command: /sbin/reboot -t now
Another way to pass arguments to a module is using yaml syntax also called 'complex args' ::
- name: restart webserver
service:
name: httpd
state: restarted
All modules technically return JSON format data, though if you are using the command line or playbooks, you don't really need to know much about
that. If you're writing your own module, you care, and this means you do not have to write modules in any particular language -- you get to choose.
Modules should be idempotent, and should avoid making any changes if
they detect that the current state matches the desired final state. When using
Ansible playbooks, these modules can trigger 'change events' in the form of
notifying 'handlers' to run additional tasks.
Documentation for each module can be accessed from the command line with the ansible-doc tool::
ansible-doc yum
A list of all installed modules is also available::
ansible-doc -l
.. seealso::
:doc:`intro_adhoc`
Examples of using modules in /usr/bin/ansible
:doc:`playbooks`
Examples of using modules with /usr/bin/ansible-playbook
:doc:`developing_modules`
How to write your own modules
:doc:`developing_api`
Examples of using modules with the Python API
`Mailing List <http://groups.google.com/group/ansible-project>`_
Questions? Help? Ideas? Stop by the list on Google Groups
`irc.freenode.net <http://irc.freenode.net>`_
#ansible IRC chat channel

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Playbooks
`````````
Playbooks are Ansible's configuration, deployment, and orchestration language. They can describe a policy you want your remote systems to enforce, or a set of steps in a general IT process.
If Ansible modules are the tools in your workshop, playbooks are your instruction manuals, and your inventory of hosts are your raw material.
At a basic level, playbooks can be used to manage configurations of and deployments to remote machines. At a more advanced level, they can sequence multi-tier rollouts involving rolling updates, and can delegate actions to other hosts, interacting with monitoring servers and load balancers along the way.
While there's a lot of information here, there's no need to learn everything at once. You can start small and pick up more features
over time as you need them.
Playbooks are designed to be human-readable and are developed in a basic text language. There are multiple
ways to organize playbooks and the files they include, and we'll offer up some suggestions on that and making the most out of Ansible.
It is recommended to look at `Example Playbooks <https://github.com/ansible/ansible-examples>`_ while reading along with the playbook documentation. These illustrate best practices as well as how to put many of the various concepts together.
.. toctree::
:maxdepth: 1
playbooks_intro
playbooks_roles
playbooks_variables
playbooks_filters
playbooks_tests
playbooks_conditionals
playbooks_loops
playbooks_blocks
playbooks_strategies
playbooks_best_practices

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Accelerated Mode
================
.. versionadded:: 1.3
.. note::
Accelerated mode is deprecated. Consider using SSH with ControlPersist and pipelining enabled instead. This feature will be removed in a future release. Deprecation warnings can be disabled by setting :code:`deprecation_warnings=False` in :code:`ansible.cfg`.
You Might Not Need This!
````````````````````````
Are you running Ansible 1.5 or later? If so, you may not need accelerated mode due to a new feature called "SSH pipelining" and should read the :ref:`pipelining` section of the documentation.
For users on 1.5 and later, accelerated mode only makes sense if you (A) are managing from an Enterprise Linux 6 or earlier host and still are on paramiko, or (B) can't enable TTYs with sudo as described in the pipelining docs.
If you can use pipelining, Ansible will reduce the amount of files transferred over the wire,
making everything much more efficient, and performance will be on par with accelerated mode in nearly all cases, possibly excluding very large file transfer. Because less moving parts are involved, pipelining is better than accelerated mode for nearly all use cases.
Accelerated moded remains around in support of EL6
control machines and other constrained environments.
Accelerated Mode Details
````````````````````````
While OpenSSH using the ControlPersist feature is quite fast and scalable, there is a certain small amount of overhead involved in
using SSH connections. While many people will not encounter a need, if you are running on a platform that doesn't have ControlPersist support (such as an EL6 control machine), you'll probably be even more interested in tuning options.
Accelerated mode is there to help connections work faster, but still uses SSH for initial secure key exchange. There is no
additional public key infrastructure to manage, and this does not require things like NTP or even DNS.
Accelerated mode can be anywhere from 2-6x faster than SSH with ControlPersist enabled, and 10x faster than paramiko.
Accelerated mode works by launching a temporary daemon over SSH. Once the daemon is running, Ansible will connect directly
to it via a socket connection. Ansible secures this communication by using a temporary AES key that is exchanged during
the SSH connection (this key is different for every host, and is also regenerated periodically).
By default, Ansible will use port 5099 for the accelerated connection, though this is configurable. Once running, the daemon will accept connections for 30 minutes, after which time it will terminate itself and need to be restarted over SSH.
In order to use accelerated mode, simply add `accelerate: true` to your play::
---
- hosts: all
accelerate: true
tasks:
- name: some task
command: echo {{ item }}
with_items:
- foo
- bar
- baz
If you wish to change the port Ansible will use for the accelerated connection, just add the `accelerate_port` option::
---
- hosts: all
accelerate: true
# default port is 5099
accelerate_port: 10000
The `accelerate_port` option can also be specified in the environment variable ACCELERATE_PORT, or in your `ansible.cfg` configuration::
[accelerate]
accelerate_port = 5099
As noted above, accelerated mode also supports running tasks via sudo, however there are two important caveats:
* You must remove requiretty from your sudoers options.
* Prompting for the sudo password is not yet supported, so the NOPASSWD option is required for sudo'ed commands.
As of Ansible version `1.6`, you can also allow the use of multiple keys for connections from multiple Ansible management nodes. To do so, add the following option
to your `ansible.cfg` configuration::
accelerate_multi_key = yes
When enabled, the daemon will open a UNIX socket file (by default `$ANSIBLE_REMOTE_TEMP/.ansible-accelerate/.local.socket`). New connections over SSH can
use this socket file to upload new keys to the daemon.

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