Restarting HTTPD service in idempotence nature in Ansible

By default, the restarted argument in the service module is not idempotent so whenever any change occurs or not occurs it always executes which is extra process consumes RAM and CPU.

So to make it idempotent there is a keyword called handlers and notify in Ansible which helps to make it idempotent.

- hosts: webserver
  vars_files:
        - "/root/webserverws_ansible/variables.yml"
  tasks:
   - name: Installing httpd package
     package:
        name: httpd
        state: present
- name: Creating Webserver Directory
     file:
        path: "{{webdir}}"
        state: directory
- name: Copying Website Content
     copy:
        src: "{{ webcontent }}"
        dest: "{{ webdir }}"
- name: Changing Configuration File
     template:
        src: "{{ confsrc }}"
        dest: "{{ confdest }}"
     notify: Restarting httpd services
- name: Configuring Firewall
     firewalld:
        port: "8080/tcp"
        state: enabled
        permanent: yes
        immediate: yes
handlers:
    - name: Restarting httpd services
       service:
         name: httpd
         state: restarted

handlers are like functions in other programming languages when they are called they execute in the above playbook we have put the task of Restarting httpd services in the handlers. notify are like a function call here it works like when it detects any changes in the task it executes task inside the handlers else it never executes for this we have to write keyword notify then the name of the task. Here in this playbook we call Restarting httpd services from the module of Changing Configuration File it will detect the changes that occur in the configuration file and will execute handler when it occurs and not execute when changes not occur.

Thanks for Reading