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# Callback Plugins

- Example callback plugins
- Enabling callback plugins
- Setting a callback plugin for `ansible-playbook`
- Setting a callback plugin for ad-hoc commands
- Plugin list

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, but can also be used to add additional output, integrate with other tools and marshall the events to a storage backend.

## Example callback plugins

The log_plays callback is an example of how to record playbook events to a log file, and the mail callback sends email on playbook failures.

The say callback responds with computer synthesized speech in relation to playbook events.

## Enabling callback plugins

You can activate a custom callback by either dropping it into a `callback_plugins` directory adjacent to your play, 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, profile_roles

## Setting a callback plugin for `ansible-playbook`

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 = dense

or for my custom callback:

    stdout_callback = mycallback

This only affects ansible-playbook by default.

## Setting a callback plugin for ad-hoc commands

The ansible ad hoc command specifically uses a different callback plugin for stdout, so there is an extra setting in ansible_configuration_settings you need to add to use the stdout callback defined above:

    [defaults]
    bin_ansible_callbacks=True

You can also set this as an environment variable:

    export ANSIBLE_LOAD_CALLBACK_PLUGINS=1

## Plugin list

You can use `ansible-doc -t callback -l` to see the list of available plugins. Use `ansible-doc -t callback <plugin name>` to see specific documents and examples.

See also

Action Plugins
  Ansible Action plugins
Cache Plugins
  Ansible cache plugins
Connection Plugins
  Ansible connection plugins
Inventory Plugins
  Ansible inventory plugins
Shell Plugins
  Ansible Shell plugins
Strategy Plugins
  Ansible Strategy plugins
Vars Plugins
  Ansible Vars plugins
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