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- name: Force limit
  # 'all' is okay here, because the fail task will force the user to specify a limit on the command line, using -l or --limit
  hosts: 'all'

  - name: checking limit arg
      msg: "you must use -l or --limit - when you really want to use all hosts, use -l 'all'"
    when: ansible_limit is not defined
    run_once: true

See also[edit]