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Chapter 11: Ansible Introduction

11.6 Handlers — restart only when needed

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In short: Handler runs at end of play if notified — so a no-change copy does not reload Nginx every time.

tasks:
  - name: Deploy nginx config snippet
    ansible.builtin.copy:
      src: files/badge-api.conf
      dest: /etc/nginx/conf.d/badge-api.conf
      mode: "0644"
    notify: Reload nginx

handlers:
  - name: Reload nginx
    ansible.builtin.service:
      name: nginx
      state: reloaded

Handler runs at end of play if notified — so a no-change copy does not reload Nginx every time.