Note_Tech

All technological notes.

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Ansible - Handler

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Handler

• handler
  • a special kind of task that runs only when it is explicitly notified by another task.
  • Handlers are typically used for actions that should happen only when a change occurs, such as restarting a service after a configuration file is updated.
  • help create dependency between tasks.
  • trigger the task by events/notification
• Example

- name: Deploy Application
  hosts: application_servers
  tasks:
    - name: Copy Application Code
      copy:
        src: app_code/
        dest: /opt/application/
      notify: Restart Application Service # notify the handler

  handlers:
    - name: Restart Application Service
      service:
        name: application_service
        state: restarted