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diff --git a/docs/docsite/rst/playbook_guide/playbooks_lookups.rst b/docs/docsite/rst/playbook_guide/playbooks_lookups.rst new file mode 100644 index 0000000..785f150 --- /dev/null +++ b/docs/docsite/rst/playbook_guide/playbooks_lookups.rst @@ -0,0 +1,39 @@ +.. _playbooks_lookups: + +******* +Lookups +******* + +Lookup plugins retrieve data from outside sources such as files, databases, key/value stores, APIs, and other services. Like all templating, lookups execute and are evaluated on the Ansible control machine. Ansible makes the data returned by a lookup plugin available using the standard templating system. Before Ansible 2.5, lookups were mostly used indirectly in ``with_<lookup>`` constructs for looping. Starting with Ansible 2.5, lookups are used more explicitly as part of Jinja2 expressions fed into the ``loop`` keyword. + +.. _lookups_and_variables: + +Using lookups in variables +========================== + +You can populate variables using lookups. Ansible evaluates the value each time it is executed in a task (or template). + +.. code-block:: yaml+jinja + + vars: + motd_value: "{{ lookup('file', '/etc/motd') }}" + tasks: + - debug: + msg: "motd value is {{ motd_value }}" + +For more details and a list of lookup plugins in ansible-core, see :ref:`plugins_lookup`. You may also find lookup plugins in collections. You can review a list of lookup plugins installed on your control machine with the command ``ansible-doc -l -t lookup``. + +.. seealso:: + + :ref:`working_with_playbooks` + An introduction to playbooks + :ref:`playbooks_conditionals` + Conditional statements in playbooks + :ref:`playbooks_variables` + All about variables + :ref:`playbooks_loops` + Looping in playbooks + `User Mailing List <https://groups.google.com/group/ansible-devel>`_ + Have a question? Stop by the google group! + :ref:`communication_irc` + How to join Ansible chat channels |