when.yaml

---
- hosts: localhost
  #gather_facts: no
  become: yes
  tasks:
  - name: Install Apache HTTP server on RedHat Server
    yum: 
      name: httpd
      state: present
    when: ansible_os_family == "RedHat"
  - name: Install Apache HTTP server on Ubuntu server
    apt:
      name: apache2
      state: present
    when: ansible_os_family == "Debian"
  - name: Install Apache HTTP server on CentOS server
    yum: 
      name: httpd
      state: present
    when: 
      - ansible_facts['distribution'] == "CentOS"
      - ansible_facts['distribution_major_version'] == "6"
  - name: Shutdown CentOS 6 and Debian 7 Servers
    command: /sbin/shutdown -t now
    when: (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "6") or
          (ansible_facts['distribution'] == "Debian" and ansible_facts['distribution_major_version'] == "7")

#https://docs.ansible.com/ansible/latest/user_guide/playbooks_conditionals.html