变量

• 字符串：使用单引号或者双引号
• 数字：整数、浮点数、。。
• 列表：[item1,item2,item3…]
• 元组：(item1,item2,item3,…)
• 字典：{k1:v1,k2:v2,k3:v3…}
• 布尔值：true/false

  算术运算：+ - / % // *

  比较操作：== != > <

  逻辑运算：and or not

  循环

  {% %}
  ……
  {% endfor %}
  示例：
  [root@node1 templates]# cat nginxconf.j2.bak
  {% for vhost in nginx_vhosts %}
  server {
  listen {{ vhost }}
  listen {{ vhost.listen }}
  }
  {% endfor %}
  worker_processes {{ ansible_processor_vcpus }};
  [root@node1 tmp]# cat nginxtemp.yam
  - hosts: mageduweb
  remote_user: root
  vars:
  nginx_vhosts: // nginx_vhosts:[web1,web2,web3]
  - web1
  listen: 80
  - web2
  listen: 81
  - web3
  listen: 82
  
  # nginx_vhosts:
  # - listen: 8080
  tasks:
  - name: template config to remote hosts
  template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf
  list1 = [1,2,3,4,5]
  for i in list1;
  echo $i

  条件判断

• name: restart Nginx
  service: name=nginx state=restarted
  when: ansible_distribution_major_version == “6”

  循环迭代

  基于字符串列表
  tasks:
  - name: create rsyncd file
  copy: src={{ item }} dest=/tmp/{{ item }}
  with_items:
  - a
  - b
  - c
  - d
  with_itmes 嵌套子变量
  #基于字典列表
  - hosts: eagleslab
  remote_user: root
  tasks:
  - name: add several users
  user: name={{ item.name }} state=present groups={{ item.groups }}
  with_items:
  - { name: ‘testuser1’ , groups: ‘wheel’}
  - { name: ‘testuser2’ , groups: ‘root’ }
  
  with_items: [a,b,c,d]