Example Ansible playbook that uses vars

example.yml

---
- name: install and start apache
  hosts: web
  become: yes
  vars:
    http_port: 80
  tasks:
    - name: httpd package is present
      yum:
        name: httpd
        state: latest

    - name: latest index.html file is present
      template:
        src: files/index.html
        dest: /var/www/html/
    
    - name: firewall allows http traffic
      firewalld:
        port: "{{ http_port }}/tcp"
        permanent: yes
        state: enabled

    - name: httpd is started
      service:
        name: httpd
        state: started