Ansible - run_once parameter

The run_once parameter can be used to run a task one time. This is typically used when you are doing something on the control node (that's your Ansible server). In this example, the set_fact module and the lookup plugin are used to store the contents of the foo.txt file into a variable named foo, and run_once is used to ensure this task is only ran one time.

- set_fact:
    foo: "{{ lookup('file', 'foo.txt') }}"
    run_once: true

 



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