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set_fact – Set host facts from a task

Synopsis
Parameters
Notes
See Also
Examples
Status

Synopsis

This module allows setting new variables.
Variables are set on a host-by-host basis just like facts discovered by the setup module.
These variables will be available to subsequent plays during an ansible-playbook run.
Set cacheable to yes to save variables across executions using a fact cache. Variables created with set_fact have different precedence depending on whether they are or are not cached.
Per the standard Ansible variable precedence rules, many other types of variables have a higher priority, so this value may be overridden.
This module is also supported for Windows targets.

Parameters

Parameter	Choices/Defaults	Comments
cacheable boolean added in 2.4	Choices: no ← yes	This boolean converts the variable into an actual 'fact' which will also be added to the fact cache, if fact caching is enabled. Normally this module creates 'host level variables' and has much higher precedence, this option changes the nature and precedence (by 7 steps) of the variable created. https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable This actually creates 2 copies of the variable, a normal 'set_fact' host variable with high precedence and a lower 'ansible_fact' one that is available for persistance via the facts cache plugin. This creates a possibly confusing interaction with `meta: clear_facts` as it will remove the 'ansible_fact' but not the host variable.
key_value - / required		The `set_fact` module takes key=value pairs as variables to set in the playbook scope. Or alternatively, accepts complex arguments using the `args:` statement.

Notes

Note

The var=value notation can only create strings or booleans. If you want to create lists/arrays or dictionary/hashes use var: [val1, val2].
Since ‘cacheable’ is now a module param, ‘cacheable’ is no longer a valid fact name as of Ansible 2.4.
This module is also supported for Windows targets.

Examples

# Example setting host facts using key=value pairs, note that this always creates strings or booleans
- set_fact: one_fact="something" other_fact="{{ local_var }}"

# Example setting host facts using complex arguments
- set_fact:
     one_fact: something
     other_fact: "{{ local_var * 2 }}"
     another_fact: "{{ some_registered_var.results | map(attribute='ansible_facts.some_fact') | list }}"

# Example setting facts so that they will be persisted in the fact cache
- set_fact:
    one_fact: something
    other_fact: "{{ local_var * 2 }}"
    cacheable: yes

# As of Ansible 1.8, Ansible will convert boolean strings ('true', 'false', 'yes', 'no')
# to proper boolean values when using the key=value syntax, however it is still
# recommended that booleans be set using the complex argument style:
- set_fact:
    one_fact: yes
    other_fact: no

Status

This module is guaranteed to have backward compatible interface changes going forward. [stableinterface]
This module is maintained by the Ansible Core Team. [core]

Red Hat Support

More information about Red Hat’s support of this module is available from this Red Hat Knowledge Base article.

Authors

Dag Wieers (@dagwieers)

Hint

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© 2012–2018 Michael DeHaan
© 2018–2019 Red Hat, Inc.
Licensed under the GNU General Public License version 3.
https://docs.ansible.com/ansible/2.9/modules/set_fact_module.html