notifyとhandler

- hosts: web
  sudo: yes
  tasks:
    - name: install apache
      yum: name=httpd state=latest
    - name: start apache and enabled
      service: name=httpd state=started enabled=yes
    - name: change owner
      file: dest=/var/www/html owner=vagrant recurse=yes
    - name: copy zabbix.php
      copy: src=./zabbix.php dest=/var/www/html/zabbix.php owner=vagrant
    - name: install php packages
      yum: name={{item}} state=latest
      with_items:
        - php
        - php-dev
        - php-mbstring
        - php-mysql
      notify:
        - restart apache
  handlers: 
    - name: restart apache
      service: name=httpd state=restarted

なるほど～～