18a4cd3985
* draft implicit localhost docs * updated per feedback * corrected docs to follow desired behaviour * Edits
31 lines
1.8 KiB
ReStructuredText
31 lines
1.8 KiB
ReStructuredText
.. _implicit_localhost:
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Implicit 'localhost'
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====================
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When you try to reference a ``localhost`` and you don't have it defined in inventory, Ansible will create an implicit one for you.::
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- hosts: all
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tasks:
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- name: check that i have log file for all hosts on my local machine
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stat: path=/var/log/hosts/{{inventory_hostname}}.log
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delegate_to: localhost
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In a case like this (or ``local_action``) when Ansible needs to contact a 'localhost' but you did not supply one, we create one for you. This host is defined with specific connection variables equivalent to this in an inventory::
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...
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hosts:
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localhost:
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vars:
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ansible_connection: local
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ansible_python_interpreter: "{{ansible_playbook_python}}"
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This ensures that the proper connection and Python are used to execute your tasks locally.
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You can override the built-in implicit version by creating a ``localhost`` host entry in your inventory. At that point, all implicit behaviors are ignored; the ``localhost`` in inventory is treated just like any other host. Group and host vars will appy, including connection vars, which includes the ``ansible_python_interpreter`` setting. This will also affect ``delegate_to: localhost`` and ``local_action``, the latter being an alias to the former.
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.. note::
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- This host is not targetable via any group, however it will use vars from ``host_vars`` and from the 'all' group.
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- This implicit host also gets triggered by using ``127.0.0.1`` or ``::1`` as they are the IPv4 and IPv6 representations of 'localhost'.
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- Even though there are many ways to create it, there will only ever be ONE implicit localhost, using the name first used to create it.
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- Having ``connection: local`` does NOT trigger an implicit localhost, you are just changing the connection for the ``inventory_hostname``.
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