ansible-playbook 之handlers和notify（三）

一 、handlers和notify结合触发条件

handlers（触发器）: 定义一些task列表，与之前剧本中task没有关系，只有资源发送变化才会采取一定的操作

notify:notify中调用handler中定义的操作

二、修改配置文件，重启服务

1、yum安装httpd

[ ~]# tree ansible/
ansible/
├── files
│   └── httpd.conf
├── file.yaml
└── httpd.yaml

[ ansible]# cat httpd.yaml 
---
- hosts: date
  remote_user: root
  
  tasks:
    - name: install httpd package
      yum: name=httpd
    - name: copy conf file
      copy: src=files/httpd.conf dest=/etc/httpd/conf backup=yes
    - name: start service
      service: name=httpd state=started enabled=yes

2、修改配置文件端口8081，在次执行，httpd服务没有重启

[ ansible]# cat httpd.yaml 
---
- hosts: date
  remote_user: root
  
  tasks:
    - name: install httpd package
      yum: name=httpd
    - name: copy conf file
      copy: src=files/httpd.conf dest=/etc/httpd/conf backup=yes
      notify: restart service
    - name: start service
      service: name=httpd state=started enabled=yes

  handlers:
    - name: restart service
      service: name=httpd state=restarted

 三、定义多个notify