官方提供@yunTaoScripts Handlers && jinja2 🔥🔥

• 实现配置文件变化了才触发操作，无变化则不触发操作。

Handlers

[root@server1 chap8]# cat handlers.yaml 
--- 
- hosts: xyt
  vars:
    http_port: 8001
  tasks:
  - name: install httpd
    yum: name=httpd state=installed
  - name: copy config file
    template: 
      src: ./httpd.conf.j2
      dest: /etc/httpd/conf/httpd.conf
    notify: restart httpd2              # 如果此部分重新执行就会触发notify。
  - name: start firewalld 
    firewalld: 
      port: "{{http_port}}/tcp"
      permanent: yes
      immediate: yes
      state: enabled
  - name: start httpd
    service: name=httpd state=started
  handlers:                             # 最后执行，不是触发的时候就执行。
  - name: restart httpd1
    service: name=httpd state=restarted
  - name: restart httpd2
    service: name=httpd state=restarted

• 查看模版文件

[root@server1 chap8]# head -n 5 httpd.conf.j2 
ServerRoot "/etc/httpd"
Listen {{http_port}}
ServerName {{ansible_fqdn}}:{{http_port}}
Include conf.modules.d/*.conf
User apache

jinja2

是个模版语言，具体使用方法可以参考下http://doc.yonyoucloud.com/doc/jinja2-docs-cn/index.html (opens new window)