CentOS 7.x Running an ansible task only once

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Running a task only once per run

To run task only once per playbook run (ie not again and again for every host), use:

     run_once: true

Refer http://stackoverflow.com/questions/22070232/how-to-get-an-ansible-check-to-run-only-once-in-a-playbook

Running a task only once even among re-run of the same playbook

To run task only once even if playbook is re-run use creates option of shell module such as:

     shell: <thing to be done only once>; touch /root/thing_done
     args:
       creates: /root/thing_done

Refer http://stackoverflow.com/questions/26409164/ansible-ignore-the-run-once-configuration-on-task

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