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Update info on python support (#38855)

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* Update the documentation to list Python 3 as official
* Add some reference targets for inventory variables so we can link to docs
* Add a platform FAQ section
  Populate it with

  * virtualenv info (previously on the python3 support page)
  * BSD (Link to the working with BSD page)
  * Solaris (Document how to work around the non-POSIX shell on some
    Solaris hosts)

  Fixes #21594

* Fix some refs in the release_and_maintenance document

* Fix unindent error in module template

Fix for the module/plugin template unintentionally unindented inside of
a raw block, leading to errors like:

ERROR: docs/docsite/rst/modules/redshift_facts_module.rst:289:0: Explicit markup ends without a blank line; unexpected unindent.

* Make wording for Solaris troubleshooting better.
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Toshio Kuratomi 2018-04-18 13:04:47 -07:00 • committed by GitHub
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59
docs/docsite/rst/installation_guide/intro_installation.rst
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@ -43,9 +43,6 @@ Control Machine Requirements
Currently Ansible can be run from any machine with Python 2 (versions 2.6 or 2.7) or Python 3 (versions 3.5 and higher) installed (Windows isn't supported for the control machine).
.. note::
Ansible 2.2 introduces a tech preview of support for Python 3 (versions 3.5 and higher). 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::
@ -64,40 +61,36 @@ 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
:file:`ansible.cfg`. You also need Python 2.6 or later.
:file:`ansible.cfg`. You also need Python 2 (version 2.6 or later) or Python 3 (version 3.5 or
later).
.. 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.)
* 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 use the :ref:`yum` or :ref`dnf` module in Ansible to install this package on remote systems
that do not have it.
.. note::
* By default, Ansible uses the python interpreter located at :file:`/usr/bin/python` to run its
modules. However, some Linux distributions may only have a Python 3 interpreter installed to
:file:`/usr/bin/python3` by default. On those systems, you may see an error like::
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.
"module_stdout": "/bin/sh: /usr/bin/python: No such file or directory\r\n"
.. note::
you can either set the :ref:`ansible_python_interpreter` inventory variable (see
:ref:`inventory`) to point at your interpreter or you can install a Python 2 interpreter for
modules to use. You will still need to set :ref:`ansible_python_interpreter` if the Python
2 interpreter is not installed to :command:`/usr/bin/python`.
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>`_.
* Ansible's "raw" module (for executing commands in a quick and dirty way) and the script module
don't even need Python installed. So technically, you can use Ansible to install a compatible
version of Python using the :ref:`raw` module, which then allows you to use everything else.
For example, if you need to bootstrap Python 2 onto a RHEL-based system, you can install it
via
By default, Ansible uses Python 2 in order to maintain compatibility with older distributions
such as 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 :ref:`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.
.. code-block:: shell
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.
ansible myhost --sudo -m raw -a "yum install -y python2"
.. _installing_the_control_machine:
@ -204,8 +197,9 @@ To install the newest version, you may need to unmask the ansible package prior
.. 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.
The current default Python slot on Gentoo is version 3.4. Ansible needs Python-3.5 or higher so
you will need to `:ref:`bootstrap <managed_node_requirements>` a compatible version onto the
machines.
Latest Releases Via pkg (FreeBSD)
+++++++++++++++++++++++++++++++++
@ -254,11 +248,6 @@ The AUR has a PKGBUILD for pulling directly from Github called `ansible-git <htt
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