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add systemd-nspawn connection driver

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This commit adds a connection driver built on top of systemd-nspawn.
This is similar to the existing `chroot` driver, except that nspawn
offers a variety of additional services. For example, it takes care of
automatically mounting `/proc` and `/sys` inside the chroot environment,
which will make a variety of tools work correctly that would otherwise
fail.

You can take advantage of other system-nspawn features to perform more
complicated tasks.  For example, on my x86_64 system I have a Raspberry
Pi disk image mounted on `/rpi`.  I can't use `chroot` with this because
the binaries contained in the image are for the wrong architecture.
However, I can use the systemd-nspawn `--bind` option to automatically
insert the appropriate qemu-arm binary into the container using an
inventory file like this:

    pi ansible_host=/rpi ansible_nspawn_extra_args='--bind /usr/bin/qemu-arm --bind /lib64'

See http://www.freedesktop.org/software/systemd/man/systemd-nspawn.html
for more information about systemd-nspawn itself.
This commit is contained in:
Lars Kellogg-Stedman 2016-02-05 11:01:38 -05:00 • committed by Brian Coca
parent 482f882798
commit 3597ca082b
3 changed files with 157 additions and 0 deletions
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lib/ansible/constants.py
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@ -346,6 +346,7 @@ PARAMIKO_LOOK_FOR_KEYS = get_config(p, 'paramiko_connection', 'look_for_
PERSISTENT_CONNECT_TIMEOUT = get_config(p, 'persistent_connection', 'connect_timeout', 'ANSIBLE_PERSISTENT_CONNECT_TIMEOUT', 30, value_type='integer')
PERSISTENT_CONNECT_RETRIES = get_config(p, 'persistent_connection', 'connect_retries', 'ANSIBLE_PERSISTENT_CONNECT_RETRIES', 10, value_type='integer')
PERSISTENT_CONNECT_INTERVAL = get_config(p, 'persistent_connection', 'connect_interval', 'ANSIBLE_PERSISTENT_CONNECT_INTERVAL', 1, value_type='integer')
ANSIBLE_NSPAWN_ARGS = get_config(p, 'nspawn_connection', 'nspawn_args', 'ANSIBLE_NSPAWN_ARGS', '-q')
# obsolete -- will be formally removed
ACCELERATE_PORT = get_config(p, 'accelerate', 'accelerate_port', 'ACCELERATE_PORT', 5099, value_type='integer')