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---
module: set_fact
short_description: Set host variable(s) and fact(s).
version_added: "1.2"
description:
- This action allows setting variables associated to the current host.
- These variables will be available to subsequent plays during an ansible-playbook run via the host they were set on.
- Set C(cacheable) to C(true) to save variables across executions using a fact cache.
Variables will keep the set_fact precedence for the current run, but will used 'cached fact' precedence for subsequent ones.
- Per the standard Ansible variable precedence rules, other types of variables have a higher priority, so this value may be overridden.
options:
key_value:
description:
- "The C(set_fact) module takes C(key=value) pairs or C(key: value) (YAML notation) as variables to set in the playbook scope.
The 'key' is the resulting variable name and the value is, of course, the value of said variable."
- You can create multiple variables at once, by supplying multiple pairs, but do NOT mix notations.
required: true
cacheable:
description:
- This boolean converts the variable into an actual 'fact' which will also be added to the fact cache.
It does not enable fact caching across runs, it just means it will work with it if already 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.
U(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 persistence via the facts cache plugin.
This creates a possibly confusing interaction with C(meta: clear_facts) as it will remove the 'ansible_fact' but not the host variable."
type: bool
default: no
version_added: "2.4"
extends_documentation_fragment:
- action_common_attributes
- action_common_attributes.conn
- action_common_attributes.flow
- action_core
attributes:
action:
details: While the action plugin does do some of the work it relies on the core engine to actually create the variables, that part cannot be overriden
support: partial
bypass_host_loop:
support: none
bypass_task_loop:
support: none
check_mode:
support: full
core:
details: While parts of this action are implemented in core, other parts are still available as normal plugins and can be partially overridden
support: partial
delegation:
details:
- while variable assignment can be delegated to a different host the execution context is always the current inventory_hostname
- connection variables, if set at all, would reflect the host it would target, even if we are not connecting at all in this case
support: partial
diff_mode:
support: none
notes:
- Because of the nature of tasks, set_fact will produce 'static' values for a variable.
Unlike normal 'lazy' variables, the value gets evaluated and templated on assignment.
- Some boolean values (yes, no, true, false) will always be converted to boolean type,
unless C(DEFAULT_JINJA2_NATIVE) is enabled. This is done so the C(var=value) booleans,
otherwise it would only be able to create strings, but it also prevents using those values to create YAML strings.
Using the setting will restrict k=v to strings, but will allow you to specify string or boolean in YAML.
- "To create lists/arrays or dictionary/hashes use YAML notation C(var: [val1, val2])."
- Since 'cacheable' is now a module param, 'cacheable' is no longer a valid fact name.
seealso:
- module: ansible.builtin.include_vars
- ref: ansible_variable_precedence
description: More information related to variable precedence and which type of variable wins over others.
author:
- Dag Wieers (@dagwieers)
a*
- name: Setting host facts using key=value pairs, this format can only create strings or booleans
ansible.builtin.set_fact: one_fact="something" other_fact="{{ local_var }}"
- name: Setting host facts using complex arguments
ansible.builtin.set_fact:
one_fact: something
other_fact: "{{ local_var * 2 }}"
another_fact: "{{ some_registered_var.results | map(attribute='ansible_facts.some_fact') | list }}"
- name: Setting facts so that they will be persisted in the fact cache
ansible.builtin.set_fact:
one_fact: something
other_fact: "{{ local_var * 2 }}"
cacheable: yes
- name: Creating list and dictionary variables
ansible.builtin.set_fact:
one_dict:
something: here
other: there
one_list:
- a
- b
- c
# 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:
- name: Setting booleans using complex argument style
ansible.builtin.set_fact:
one_fact: yes
other_fact: no
- name: Creating list and dictionary variables using 'shorthand' YAML
ansible.builtin.set_fact:
two_dict: {'something': here2, 'other': somewhere}
two_list: [1,2,3]
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