1、举例：
---
- name: create user
  hosts: webserver
  remote_user: root

  tasks:
     - name: creat users
       user: name=test1 uid=36 system=yes
     - name: create group
       group: name=httpd system=yes
模块也可以写成如下格式：
  tasks:
     - name: creat users
       user: 
         name: test1 
         uid: 36 
         system: yes
     - name: create group
       group: 
          name: httpd 
          system: yes
当写成如上格式，引用变量时，变量需要加双引号
  tasks:
     - name: creat users
       user: 
         name: "{{ name1 }}"
         uid: "{{ uid1 }}"


2、举例：
---
- name: install service
  hosts: webserver
  remote_user: root

  tasks:
     - name: install httpd
       yum: name=httpd state=present
     - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
     - name: start service
       service: name=httpd state=started enabled=yes

解析：
     - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
【如上，当一个任务name下有相同的模块时，yml只会识别一个，故需要再写一个任务name】
    - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
    - name: copy conf file2
       cpoy: src=files/http.conf dest=/etc/httpd/conf
亦或：
     tasks:
       - copy: **
       - copy: **
用"-" 开头就表示是name任务级别了，即两个copy模块就是两个不同的任务了；此时不要写- name: ** 因为写了- name: **
就必须是 - name: **   这种格式，- name下一定得接上模块内容。
          copy: **
亦或：
     tasks:
       - name: **
         module1: **
       - copy: **
       - copy: **
解释：- name: ** 到module1 表示一个任务的结束了，另起一行的"-"开头的 - copy表示另一个任务了

notify和handlers的使用

3、举例：当配置文件更改后重新执行脚本，name服务本身是启动的，故不会再起，这样配置文件未生效，所以标记当配置文件
更改并执行后，就执行重启服务的动作。
---
- name: install service
  hosts: webserver
  remote_user: root

  tasks:
     - name: install httpd
       yum: name=httpd state=present
     - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
       notify:  restart service   【注意：当copy的动作执行后就会下发一个通知，由notity下发通知，通知给handlers的name】
     - name: start service
       service: name=httpd state=started enabled=yes
   handlers:              【handlers和tasks同级别】
      - name: restart service
         service: name=httpd state=restarted

@2、【notify也可同时通知多个handlers的name:】
---
- name: install service
  hosts: webserver
  remote_user: root

  tasks:
     - name: install httpd
       yum: name=httpd state=present
     - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
       notify:  
         - restart service
         - ping service 
     - name: start service
       service: name=httpd state=started enabled=yes
   handlers:             
      - name: restart service
         service: name=httpd state=restarted
      - name: ping service
         ping：

tags的使用

4、举例：
---
- name: install service
  hosts: webserver
  remote_user: root

  tasks:
     - name: install httpd
       yum: name=httpd state=present
     - name: copy conf file
       cpoy: src=files/httpd.conf dest=/etc/httpd/conf
       tags: copy_conf
     - name: start service
       service: name=httpd state=started enabled=yes
       tags: services

ansible-palybook -t copy_conf file.yml  【-t 指定tags名称，调用tags标记的任务执行，所以这里只会执行copy conf file一个name任务】
【注：多个任务可以共用一个标签tags】