---
- hosts: clientes
  user: root

  tasks:

  - name: restart apache en debian
    service:
      name: apache2
      state: started
      enabled: yes
    when: ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'

  - name: restart httpd en centos
    service:
      name: httpd
      state: started
      enabled: yes
    when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
...