主机安装ansible，使用命令查询playbook语法范例
命令 ansible-doc [模块名]

示例：

~]# ansible-doc file

输入：/EXAMPLES
- name: Change file ownership, group and permissions
  file:
    path: /etc/foo.conf
    owner: foo
    group: foo
    mode: '0644'

- name: Give insecure permissions to an existing file
  file:
    path: /work
    owner: root
    group: root
    mode: '1777'

- name: Create a symbolic link
  file:
    src: /file/to/link/to
    dest: /path/to/symlink
    owner: foo
    group: foo
    state: link

- name: Create two hard links
  file:
    src: '/tmp/{{ item.src }}'
    dest: '{{ item.dest }}'
    state: hard
  loop:
    - { src: x, dest: y }
    - { src: z, dest: k }

- name: Touch a file, using symbolic modes to set the permissions (equivalent to 0644)
  file:
    path: /etc/foo.conf
    state: touch
    mode: u=rw,g=r,o=r

- name: Touch the same file, but add/remove some permissions
  file: