ansible 循环语句with_items这个示例实现了一个批量创建系统用户的功能，with_items会自动循环执行上面的语句user: name={{ item }} state=present groups=wheel,
循环次数为with_items的元素个数,这里有两个元素，分别为testuser1,testuser2会分别替换{{ item }}项
[root@node110 yml]# cat circle.yml
---
- hosts: 192.168.198.120
tasks:
- name: add several users
user: name={{ item }} state=present groups=wheel
with_items:
- testuser1
- testuser2
客户端：
cat /etc/passwd
testuser1:x:560:560::/home/testuser1:/bin/bash
testuser2:x:561:561::/home/testuser2:/bin/bash
循环也支持列表(list)的形式 ：通过with_flattened语句来实现：
#file: roles/foo/vars/main.yml
packages_base:
- [ 'foo-package','bar-package' ]
packages_apps:
- [['one-package'],['two-package']]
- [['red-package'],['blue-package']]
circle.yml
---
- hosts: 192.168.198.120
tasks:
- name: flattened loop demo
yum: name={{ item }} state=installed
with_flattened:
- packages_base
- packages_apps
