ansible/docs/docsite/rst/reference_appendices/special_variables.rst

.. _special_variables:

Special Variables
=================

Magic variables
---------------
These variables cannot be set directly by the user; Ansible will always override them to reflect internal state.

.. glossary::

    ansible_check_mode
        Boolean that indicates if we are in check mode or not

    ansible_config_file
        The full path of used Ansible configuration file

    ansible_dependent_role_names
        The names of the roles currently imported into the current play as dependencies of other plays

    ansible_diff_mode
        Boolean that indicates if we are in diff mode or not

    ansible_forks
        Integer reflecting the number of maximum forks available to this run

    ansible_inventory_sources
        List of sources used as inventory

    ansible_limit
        Contents of the ``--limit`` CLI option for the current execution of Ansible

    ansible_loop
        A dictionary/map containing extended loop information when enabled through ``loop_control.extended``

    ansible_loop_var
        The name of the value provided to ``loop_control.loop_var``. Added in ``2.8``

    ansible_index_var
        The name of the value provided to ``loop_control.index_var``. Added in ``2.9``

    ansible_parent_role_names
        When the current role is being executed by means of an :ref:`include_role <include_role_module>` or :ref:`import_role <import_role_module>` action, this variable contains a list of all parent roles, with the most recent role (in other words, the role that included/imported this role) being the first item in the list.
        When multiple inclusions occur, this list lists the *last* role (in other words, the role that included this role) as the *first* item in the list. It is also possible that a specific role exists more than once in this list.

        For example: When role **A** includes role **B**, inside role B, ``ansible_parent_role_names`` will equal to ``['A']``. If role **B** then includes role **C**, the list becomes ``['B', 'A']``.

    ansible_parent_role_paths
        When the current role is being executed by means of an :ref:`include_role <include_role_module>` or :ref:`import_role <import_role_module>` action, this variable contains a list of all parent roles paths, with the most recent role (in other words, the role that included/imported this role) being the first item in the list.
        Please refer to ``ansible_parent_role_names`` for the order of items in this list.

    ansible_play_batch
        List of active hosts in the current play run limited by the serial, aka 'batch'. Failed/Unreachable hosts are not considered 'active'.

    ansible_play_hosts
        List of hosts in the current play run, not limited by the serial. Failed/Unreachable hosts are excluded from this list.

    ansible_play_hosts_all
        List of all the hosts that were targeted by the play

    ansible_play_role_names
        The names of the roles currently imported into the current play. This list does **not** contain the role names that are
        implicitly included through dependencies.

    ansible_playbook_python
        The path to the python interpreter being used by Ansible on the controller

    ansible_role_names
        The names of the roles currently imported into the current play, or roles referenced as dependencies of the roles
        imported into the current play.

    ansible_role_name
        The fully qualified collection role name, in the format of ``namespace.collection.role_name``

    ansible_collection_name
        The name of the collection the task that is executing is a part of. In the format of ``namespace.collection``

    ansible_run_tags
        Contents of the ``--tags`` CLI option, which specifies which tags will be included for the current run. Note that if ``--tags`` is not passed, this variable will default to ``["all"]``.

    ansible_search_path
        Current search path for action plugins and lookups, in other words, where we search for relative paths when you do ``template: src=myfile``

    ansible_skip_tags
        Contents of the ``--skip-tags`` CLI option, which specifies which tags will be skipped for the current run.

    ansible_verbosity
        Current verbosity setting for Ansible

    ansible_version
       Dictionary/map that contains information about the current running version of ansible, it has the following keys: full, major, minor, revision and string.

    group_names
        List of groups the current host is part of

    groups
        A dictionary/map with all the groups in inventory and each group has the list of hosts that belong to it

    hostvars
        A dictionary/map with all the hosts in inventory and variables assigned to them

    inventory_hostname
        The inventory name for the 'current' host being iterated over in the play

    inventory_hostname_short
        The short version of `inventory_hostname`

    inventory_dir
        The directory of the inventory source in which the `inventory_hostname` was first defined

    inventory_file
        The file name of the inventory source in which the `inventory_hostname` was first defined

    omit
        Special variable that allows you to 'omit' an option in a task, for example ``- user: name=bob home={{ bobs_home|default(omit) }}``

    play_hosts
        Deprecated, the same as ansible_play_batch

    ansible_play_name
        The name of the currently executed play. Added in ``2.8``. (`name` attribute of the play, not file name of the playbook.)

    playbook_dir
        The path to the directory of the current playbook being executed.  NOTE: This might be different than directory of the playbook passed to the ``ansible-playbook`` command line when a playbook contains a ``import_playbook`` statement. 

    role_name
        The name of the role currently being executed.

    role_names
        Deprecated, the same as ansible_play_role_names

    role_path
        The path to the dir of the currently running role

Facts
-----
These are variables that contain information pertinent to the current host (`inventory_hostname`). They are only available if gathered first. See :ref:`vars_and_facts` for more information.

.. glossary::

    ansible_facts
        Contains any facts gathered or cached for the `inventory_hostname`
        Facts are normally gathered by the :ref:`setup <setup_module>` module automatically in a play, but any module can return facts.

    ansible_local
        Contains any 'local facts' gathered or cached for the `inventory_hostname`.
        The keys available depend on the custom facts created.
        See the :ref:`setup <setup_module>` module and :ref:`local_facts` for more details.

.. _connection_variables:

Connection variables
---------------------
Connection variables are normally used to set the specifics on how to execute actions on a target. Most of them correspond to connection plugins, but not all are specific to them; other plugins like shell, terminal and become are normally involved.
Only the common ones are described as each connection/become/shell/etc plugin can define its own overrides and specific variables.
See :ref:`general_precedence_rules` for how connection variables interact with :ref:`configuration settings<ansible_configuration_settings>`, :ref:`command-line options<command_line_tools>`, and :ref:`playbook keywords<playbook_keywords>`.

.. glossary::

    ansible_become_user
        The user Ansible 'becomes' after using privilege escalation. This must be available to the 'login user'.

    ansible_connection
        The connection plugin actually used for the task on the target host.

    ansible_host
        The ip/name of the target host to use instead of `inventory_hostname`.

    ansible_python_interpreter
        The path to the Python executable Ansible should use on the target host.

    ansible_user
        The user Ansible 'logs in' as.