一、简介

通常一个任务会做很多事情，如创建大量的用户，安装很多包，或重复的轮询特定的步骤，直到某种结果条件为止，Ansible为我们提供了此支持。下面是关于循环的一些语句。

with_items     #标准循环

with_nested    #嵌套循环

with_dict          #字典循环(Looping over hashed)

with_file       #循环文件

with_fileglob    #通配符循环文件

with_together    #循环映射

with_subelements  #子元素循环

with_sequence      #生成一系列的数字

with_random_choice   #任意选择

#with_first_found      #选择第一个找到的，不会用

with_lines          #循环程序执行的输出信息with_items:`command_result`.`stdout_lines`

with_flattened      #循环列表中的列表的item

二、实例

---
- hosts: local                        #with_item 和 with_nested 用法vars:Sta: falseUser: [ "Aheahe","yunzhonghe" ]tasks:- name: Standard Loopsdebug: msg="{{ item.name }},{{ item.fun }}"with_items:                  #生成标准循环- { name: Loops, fun: xx }- { name: Conditional, fun: yy }when: Sta- name: Nested Loopsdebug: msg= "name={{ item[0] }},priv={{ item[1] }}"with_nested:                  #嵌套循环- "{{ User }}"                #这里的User 可以直接使用列表。- [ "Student","Engineer","Friends" ]

---
- hosts: local          #with_dict 用法
#  vars_files:
#    hash.ymlvars:users:alice:name: Alice Appleworthtelephone: 123-456-7890bob:name: Bob Bananaramatelephone: 987-654-3210tasks:- name: Print phone recordsdebug: msg="User  item.key  is  item.value.name   item.value.telephone "with_dict: users              #循环列表可以查看输出信息。以获取结果

---
- hosts: local                 #with_file 与 with_fileglob 用法。vars:test_file: falsetasks:- name: test fileshell: echo {{ item }}with_file:         #循环文件的内容- test                          #test文件里面为任意内容。- test1when: test_file- name: Test file Globshell: echo {{ item }}with_fileglob:     #循环文件的通配符。- /home/aheahe/playbook/*

---
- hosts: local                 #with_together用法vars:alpha: [ 'a', 'b', 'c', 'd' ]numbers:  [ 1, 2, 3, 4 ]test: [ 'A', 'B', 'C', 'D' ]tasks:- debug: msg="{{ item.0 }} and {{ item.1 }} and {{ item.2 }}"with_together:                #循环映射信息- "`alpha`"- "`numbers`"- "`test`"

---
- hosts: local         #with_subelement用法vars:users:- name: aliceauthorized:- /tmp/alice/onekey.pub- /tmp/alice/twokey.pubmysql:password: mysql-passwordhosts:- "%"- "127.0.0.1"- "::1"- "localhost"privs:- "*.*:SELECT"- "DB1.*:ALL"- name: bobauthorized:- /tmp/bob/id_rsa.pubmysql:password: other-mysql-passwordhosts:- "db1"privs:- "*.*:SELECT"- "DB2.*:ALL"tasks:- name: Test1shell: echo "name={{ item.name }}"with_items: "`users`"- name: Test2shell: echo "User={{ item.0.name }},key={{ item.1 }}"with_subelements:         #循环子元素。- users- authorized

---
- hosts: localtasks:- name: Learn loop sequencedebug: msg={{ item }}with_sequence: start=0 end=6 stride=2

---
- hosts: local                 # with_random_choice 用法tasks:- name: Learn Randomdebug: msg={{ item }}with_random_choice:- "go through the door"- "drink from the goblet"- "press the red button"- "do nothing"

---
- hosts: local         #with_lines 用法tasks:- name: test resultshell: echo {{ item }}with_lines: /bin/df -Th- name: flattened loop demo                       #with_flatted用法yum: name={{ item }} state=installedwith_flattened:- "`packages_base`"- "`packages_apps`"

----
# file: roles/foo/vars/main.yml
packages_base:- [ 'foo-package', 'bar-package' ]
packages_apps:- [ ['one-package', 'two-package' ]]- [ ['red-package'], ['blue-package']]