ed5f0d5c45
* Add docs for inventory caching
* Fix subsection headers
* Fix top header
(cherry picked from commit c4d1f0d416)
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3.7 KiB
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130 lines
3.7 KiB
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.. contents:: Topics
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Cache Plugins
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=============
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Cache plugin implement a backend caching mechanism that allows Ansible to store gathered facts or inventory source data
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without the performance hit of retrieving them from source.
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The default cache plugin is the :doc:`memory <cache/memory>` plugin, which only caches the data for the current execution of Ansible. Other plugins with persistent storage are available to allow caching the data across runs.
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You can use a separate cache plugin for inventory and facts. If an inventory-specific cache plugin is not provided and inventory caching is enabled, the fact cache plugin is used for inventory.
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.. _enabling_cache:
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Enabling Fact Cache Plugins
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---------------------------
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Only one fact cache plugin can be active at a time.
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You can enable a cache plugin in the Ansible configuration, either via environment variable:
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.. code-block:: shell
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export ANSIBLE_CACHE_PLUGIN=jsonfile
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or in the ``ansible.cfg`` file:
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.. code-block:: ini
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[defaults]
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fact_caching=redis
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You will also need to configure other settings specific to each plugin. Consult the individual plugin documentation
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or the Ansible :ref:`configuration <ansible_configuration_settings>` for more details.
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A custom cache plugin is enabled by dropping it into a ``cache_plugins`` directory adjacent to your play, inside a role, or by putting it in one of the directory sources configured in :ref:`ansible.cfg <ansible_configuration_settings>`.
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Enabling Inventory Cache Plugins
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--------------------------------
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Inventory may be cached using a file-based cache plugin (like jsonfile). Check the specific inventory plugin to see if it supports caching.
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If an inventory-specific cache plugin is not specified Ansible will fall back to caching inventory with the fact cache plugin options.
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The inventory cache is disabled by default. You may enable it via environment variable:
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.. code-block:: shell
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export ANSIBLE_INVENTORY_CACHE=True
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or in the ``ansible.cfg`` file:
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.. code-block:: ini
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[inventory]
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cache=True
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or if the inventory plugin accepts a YAML configuration source, in the configuration file:
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.. code-block:: yaml
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# dev.aws_ec2.yaml
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plugin: aws_ec2
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cache: True
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Similarly with fact cache plugins, only one inventory cache plugin can be active at a time and may be set via environment variable:
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.. code-block:: shell
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export ANSIBLE_INVENTORY_CACHE_PLUGIN=jsonfile
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or in the ansible.cfg file:
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.. code-block:: ini
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[inventory]
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cache_plugin=jsonfile
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or if the inventory plugin accepts a YAML configuration source, in the configuration file:
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.. code-block:: yaml
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# dev.aws_ec2.yaml
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plugin: aws_ec2
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cache_plugin: jsonfile
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Consult the individual inventory plugin documentation or the Ansible :ref:`configuration <ansible_configuration_settings>` for more details.
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.. _using_cache:
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Using Cache Plugins
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-------------------
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Cache plugins are used automatically once they are enabled.
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.. _cache_plugin_list:
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Plugin List
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-----------
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You can use ``ansible-doc -t cache -l`` to see the list of available plugins.
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Use ``ansible-doc -t cache <plugin name>`` to see specific documentation and examples.
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.. toctree:: :maxdepth: 1
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:glob:
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cache/*
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.. seealso::
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:doc:`action`
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Ansible Action plugins
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:doc:`callback`
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Ansible callback plugins
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:doc:`connection`
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Ansible connection plugins
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:doc:`inventory`
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Ansible inventory plugins
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:doc:`shell`
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Ansible Shell plugins
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:doc:`strategy`
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Ansible Strategy plugins
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:doc:`vars`
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Ansible Vars plugins
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`User Mailing List <https://groups.google.com/forum/#!forum/ansible-devel>`_
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Have a question? Stop by the google group!
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`webchat.freenode.net <https://webchat.freenode.net>`_
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#ansible IRC chat channel
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