cmueller/ansible
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Edited dynamic vs. static includes update

Browse source
This commit is contained in:
Scott Butler 2016-08-30 10:27:35 -07:00
parent 8f364b549b
commit 4ba90a3817
1 changed files with 13 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
docsite/rst/playbooks_roles.rst
View file

@ -146,16 +146,14 @@ inside another.
.. _dynamic_static:
Dynamic vs. Static Includes
Dynamic versus Static Includes
```````````````````````````
As of Ansible 2.0, the way include tasks are processed was changed. In 1.9.x and lower, includes acted
as a pre-processor statement and were read in during playbook parsing time. This created problems when
variables from sources such as inventory variables like group and host vars (which are not available during
Ansible 2.0 changes how include tasks are processed. In previous versions of Ansible, includes acted as a pre-processor statement and were read during playbook parsing time. This created problems with things like inventory variables (like group and host vars, which are not available during
the parsing time) were used in the included file name.
Ansible 2.0 instead made includes "dynamic", meaning they are not evaluated until the include task is
reached during the play execution. This changed allowed the reintroduction of loops on include statements,
Ansible 2.0 instead makes includes "dynamic", meaning they are not evaluated until the include task is
reached during the play execution. This change allows the reintroduction of loops on include statements,
such as the following::
- include: foo.yml param={{item}}
@ -173,11 +171,11 @@ It is also possible to use variables from any source with a dynamic include::
the ``linear`` strategy keeps the hosts in lock-step by alternating
which hosts are executing tasks while doing a ``noop`` for all other
hosts. For example, if you had hostA, hostB and hostC with the above
example, hostA would execute all of he tasks in hostA.yml while hostB
example, hostA would execute all of the tasks in hostA.yml while hostB
and hostC waited. It is generally better to do the above with the
``free`` strategy, which does not force hosts to execute in lock-step.
Having includes always be dynamic introduced some other limitations, due to the fact that the included
Dynamic includes introduced some other limitations due to the fact that the included
file is not read in until that task is reached during the execution of the play. When using dynamic includes,
it is important to keep these limitations in mind:
@ -187,23 +185,23 @@ it is important to keep these limitations in mind:
* Tasks which only exist inside a dynamic include will not show up in --list-tasks output.
.. note::
In Ansible 1.9.x and prior, an error would be raised if a tag name was
In Ansible 1.9.x and earlier, an error would be raised if a tag name was
used with ``--tags`` or ``--skip-tags``. This error was disabled in Ansible
2.0 to prevent incorrect failures with tags which only existed inside of
dynamic includes.
To work around these limitations, Ansible 2.1 introduced the ``static`` option for includes::
To work around these limitations, Ansible 2.1 introduces the ``static`` option for includes::
- include: foo.yml
static: <yes|no|true|false>
By default in Ansible 2.1 and higher, includes will automatically be treated as static rather than
By default in Ansible 2.1 and higher, includes are automatically treated as static rather than
dynamic when the include meets the following conditions:
* The include does not use any loops.
* The included file name does not use any variables.
* The ``static`` option is not explicitly disabled (ie. ``static: no``).
* The ansible.cfg options to force static includes (see below) are disabled.
* The include does not use any loops
* The included file name does not use any variables
* The ``static`` option is not explicitly disabled (ie. ``static: no``)
* The ansible.cfg options to force static includes (see below) are disabled
Two options are available in the ansible.cfg configuration for static includes: