Changed when

- name: Changed_when
  hosts: nodes
  become: true
  tasks:
    - name: Uptime
      shell: uptime
      register: uptime_message
      changed_when: "'Success' in uptime_message"

“uptime_message” ile gelen textin icinde “Success” string i varsa chaged yoksa chenaged olmuyor. Normalde uptime her saniye changed ama artik bu kural sebebiyle changed olmuyor.

failed when

   - name: Print message
      debug:
        msg: "{{ uptime_message }}"
      failed_when: not myvariable is defined 

gelen “uptime_message” string inin icinde myvariable yoksa veya null ise.