Ansible delegate and run_once

Question

i write one specific roles for local and dev environment that will drop and recreate the database from first server in dbserver group which mostly used as the master databas

Answer 1

If you need to delegate your task to the first server only and run it once no matter how many servers in the current play, use:

- name: drop database
  mysql_db: name={{ targetdbname }} state=absent
  when: targetdeploydb == "new"
  delegate_to: "{{ groups['dbserver'] | first }}"
  run_once: true