[Ansible系列]ansible playbook的with_x循环

目录

前言

 简介

 with_x的用法

 1.    with_items        

 2.    with_list

 3.    with_flattened

 4.    with_together

5.    with_nested

 6.    with_indexed_items

 7.    with_dict

8.    with_file

 9.    with_fileglob

 10.    with_lines

---

前言

         ansible在2.5版本之前，playbook中的循环语法都是使用的with_x，其中with_x包括：with_item，with_list，with_dic等等；在ansible的2.5版本开始到之后，playbook循环语法推荐的是loop，实际上loop和with_x的使用时如初一则的，后面我们就对这两种形式来展开说说。

 简介

        我们在编写playbook的时候，不可避免的要执行一些重复性操作，比如指安装软件包，批量创建用 户，操作某个目录下的所有文件等。正如我们所说，ansible一门简单的自动化语言，所以流程控 制、循环语句这些编程语言的基本元素它同样都具备。 
         在Ansible 2.5以前，playbook通过不同的循环语句以实现不同的循环，这些语句使用 with_ 作为前 缀。这些语法目前仍然兼容，但在未来的某个时间点，会逐步废弃。 
下面是一些比较常见的with_x循环语句：（加粗的为重点）

·  with_items
·  with_flattened
·  with_list
·  with_together
·  with_nested
·  with_indexed_items
·  with_sequence
·  with_random_choice
·  with_dict
·  with_subelement
·  with_file
·  with_fileglob
·  with_lines

 with_x的用法

 1.    with_items        

         简单的列表循环

 示例1：  循环打印inventory中all的主机

[root@clinet ansible_2]# cat hosts 
[dbserver:children]
mdb
sdb

[mdb]
192.168.194.130 mysql_type=master server_id=1

[sdb]
192.168.194.131 mysql_type=slave server_id=2
[root@clinet ansible_2]# 


[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item }}"
      with_items: "{{ groups['all'] }}"
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=192.168.194.130) => {
    "msg": "192.168.194.130"
}
ok: [192.168.194.130] => (item=192.168.194.131) => {
    "msg": "192.168.194.131"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 示例2：  直接在with_items中定义循环的列表

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item }}"
      with_items: 
      - 'xhz'
      - 'flf'
      - 'wsz'
      - 'xjl'
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=xhz) => {
    "msg": [
        "xhz"
    ]
}
ok: [192.168.194.130] => (item=flf) => {
    "msg": [
        "flf"
    ]
}
ok: [192.168.194.130] => (item=wsz) => {
    "msg": [
        "wsz"
    ]
}
ok: [192.168.194.130] => (item=xjl) => {
    "msg": [
        "xjl"
    ]
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 
[root@clinet ansible_2]# 

 也可以写成：

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item }}"
      with_items: ['xhz', 'flf', 'wsz', 'xjl']
[root@clinet ansible_2]# 

示例3：  在with_items中定义复杂的列表。

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item.path1 }}/{{ item.path2 }}"
      with_items: 
      - {'path1': 'one', 'path2': 'two'}
      - {'path1': 'three', 'path2': 'four'}
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item={u'path2': u'two', u'path1': u'one'}) => {
    "msg": [
        "one/two"
    ]
}
ok: [192.168.194.130] => (item={u'path2': u'four', u'path1': u'three'}) => {
    "msg": [
        "three/four"
    ]
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 2.    with_list

        与 with_items 一样，也是用于循环列表。区别是，如果列表的值也是列表， with_items 会将第一层 嵌套的列表拉平，而 with_list 会将值作为一个整体返回。 

示例1： 使用with_items循环列表[[1,2], [a,b]] 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item }}"
      with_items:  
      - [1,2]
      - [a,b]
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=1) => {
    "msg": [
        1
    ]
}
ok: [192.168.194.130] => (item=2) => {
    "msg": [
        2
    ]
}
ok: [192.168.194.130] => (item=a) => {
    "msg": [
        "a"
    ]
}
ok: [192.168.194.130] => (item=b) => {
    "msg": [
        "b"
    ]
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 示例1： 使用with_list循环列表[[1,2], [a,b]] 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item }}"
      with_list:  
      - [1,2]
      - [a,b]
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[1, 2]) => {
    "msg": [
        [
            1, 
            2
        ]
    ]
}
ok: [192.168.194.130] => (item=[u'a', u'b']) => {
    "msg": [
        [
            "a", 
            "b"
        ]
    ]
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 注意：     

with_list:  
      - [1,2]
      - [a,b]

等价于====> 

with_list:  [[1,2], [a,b]]

 3.    with_flattened

        with_flattened 与 with_items 类似，当处理复杂的多级列表嵌套时，会将所有的列表全部拉平。 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item }}"
      with_flattened:  
      - [1,2,[3,4,[x,y]]]
      - [a,b]
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=1) => {
    "msg": [
        1
    ]
}
ok: [192.168.194.130] => (item=2) => {
    "msg": [
        2
    ]
}
ok: [192.168.194.130] => (item=3) => {
    "msg": [
        3
    ]
}
ok: [192.168.194.130] => (item=4) => {
    "msg": [
        4
    ]
}
ok: [192.168.194.130] => (item=x) => {
    "msg": [
        "x"
    ]
}
ok: [192.168.194.130] => (item=y) => {
    "msg": [
        "y"
    ]
}
ok: [192.168.194.130] => (item=a) => {
    "msg": [
        "a"
    ]
}
ok: [192.168.194.130] => (item=b) => {
    "msg": [
        "b"
    ]
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 4.    with_together

         with_together 可以将两个列表中的元素对齐合并。

示例1： 使用with_together循环两个相同长度列表 。

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  vars:
    alpha: ['a', 'b']
    numbers: [1,2]
  tasks:
    - name: debug groups all
      debug:
        msg: 
        - "{{ item[0] }}"
        - "{{ item[1] }}"
      with_together:  
      - "{{ alpha}}"
      - "{{ numbers }}"
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[u'a', 1]) => {
    "msg": "a and 1"
}
ok: [192.168.194.130] => (item=[u'b', 2]) => {
    "msg": "b and 2"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

示例2：  使用with_together循环两个不同长度列表 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  vars:
    alpha: ['a', 'b', 'c']
    numbers: [1,2]
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item[0] }} and {{ item[1] }}"
      with_together:  
      - "{{ alpha}}"
      - "{{ numbers }}"
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[u'a', 1]) => {
    "msg": "a and 1"
}
ok: [192.168.194.130] => (item=[u'b', 2]) => {
    "msg": "b and 2"
}
ok: [192.168.194.130] => (item=[u'c', None]) => {
    "msg": "c and "
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 5.    with_nested

         嵌套循环。

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item[0] }} and {{ item[1] }}"
      with_nested:  
      - ['alice','bob']
      - [1, 2, 3]
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[u'alice', 1]) => {
    "msg": "alice and 1"
}
ok: [192.168.194.130] => (item=[u'alice', 2]) => {
    "msg": "alice and 2"
}
ok: [192.168.194.130] => (item=[u'alice', 3]) => {
    "msg": "alice and 3"
}
ok: [192.168.194.130] => (item=[u'bob', 1]) => {
    "msg": "bob and 1"
}
ok: [192.168.194.130] => (item=[u'bob', 2]) => {
    "msg": "bob and 2"
}
ok: [192.168.194.130] => (item=[u'bob', 3]) => {
    "msg": "bob and 3"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 6.    with_indexed_items

         在循环处理列表时，为列表中的每一项添加索引（从0开始的数字索引）

示例1： with_indexed_items循环简单列表

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item[0] }} and {{ item[1] }}"
      with_indexed_items:  
      - test1
      - test2
      - test3
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[0, u'test1']) => {
    "msg": "0 and test1"
}
ok: [192.168.194.130] => (item=[1, u'test2']) => {
    "msg": "1 and test2"
}
ok: [192.168.194.130] => (item=[2, u'test3']) => {
    "msg": "2 and test3"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

示例2： with_indexed_items循环复杂列表。 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item[0] }} and {{ item[1] }}"
      with_indexed_items:  
      - test1
      - ['test2', 'test3']
      - test4
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[0, u'test1']) => {
    "msg": "0 and test1"
}
ok: [192.168.194.130] => (item=[1, u'test2']) => {
    "msg": "1 and test2"
}
ok: [192.168.194.130] => (item=[2, u'test3']) => {
    "msg": "2 and test3"
}
ok: [192.168.194.130] => (item=[3, u'test4']) => {
    "msg": "3 and test4"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

可以看到，其在处理更复杂列表的时候，会将列表拉平，类似于 with_items 。 与 with_items 一样，其也只会拉平第一层列表，如果存在多层列表嵌套，则更深的嵌套不会被拉 平。 

 7.    with_dict

        循环字典。 

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  vars:
    users:
      xhz:
        name: xiaohaizhou
        iphone: 185xxx
      flf:
        name: fulifang
        iphone: 132xxx
  tasks:
    - name: debug groups all
      debug:
        msg: "user {{ item['key'] }} name is {{ item['value']['name'] }} iphone is {{ item['value']['iphone'] }}"
      with_dict: "{{ users }}"
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item={u'key': u'xhz', u'value': {u'name': u'xiaohaizhou', u'iphone': u'185xxx'}}) => {
    "msg": "user xhz name is xiaohaizhou iphone is 185xxx"
}
ok: [192.168.194.130] => (item={u'key': u'flf', u'value': {u'name': u'fulifang', u'iphone': u'132xxx'}}) => {
    "msg": "user flf name is fulifang iphone is 132xxx"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

8.    with_file

         用于循环主控端的文件列表，获取文件中的内容。（注意： 循环的是主控端的文件列表，不是被控端的）

- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item }}"
      with_file: 
      - /etc/passwd
      - /etc/shadow
      - /root/ansible_test/ansible_2/hosts

 9.    with_fileglob

         上面 with_file 用于获取文件的内容，而 with_fileglob 则用于匹配文件名称。可以通过该关键字， 在指定的目录中匹配符合模式的文件名。与 with_file 相同的是， with_fileglob 操作的文件也是主 控端的文件而非被控端的文件。

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item }}"
      with_fileglob: 
      - /root/ansible_test/ansible_2/yum_file/*.yml
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=/root/ansible_test/ansible_2/yum_file/creat_user.yml) => {
    "msg": "/root/ansible_test/ansible_2/yum_file/creat_user.yml"
}
ok: [192.168.194.130] => (item=/root/ansible_test/ansible_2/yum_file/123.yml) => {
    "msg": "/root/ansible_test/ansible_2/yum_file/123.yml"
}
ok: [192.168.194.130] => (item=/root/ansible_test/ansible_2/yum_file/234.yml) => {
    "msg": "/root/ansible_test/ansible_2/yum_file/234.yml"
}
ok: [192.168.194.130] => (item=/root/ansible_test/ansible_2/yum_file/nging_web.yml) => {
    "msg": "/root/ansible_test/ansible_2/yum_file/nging_web.yml"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]# 

 10.    with_lines

         with_lines循环结构会让你在控制主机上执行任意命令，并对命令的输出进行逐行迭代。

[root@clinet ansible_2]# cat yum_file/with_x/with_x.yml 
- hosts: mdb
  gather_facts: no
  tasks:
    - name: debug groups all
      debug:
        msg: "{{ item }}"
      with_lines: 
      - cat /root/ansible_test/ansible_2/hosts
[root@clinet ansible_2]# 
[root@clinet ansible_2]# 
[root@clinet ansible_2]# ansible-playbook yum_file/with_x/with_x.yml 

PLAY [mdb] **********************************************************************************************************************************************************

TASK [debug groups all] *********************************************************************************************************************************************
ok: [192.168.194.130] => (item=[dbserver:children]) => {
    "msg": "[dbserver:children]"
}
ok: [192.168.194.130] => (item=mdb) => {
    "msg": "mdb"
}
ok: [192.168.194.130] => (item=sdb) => {
    "msg": "sdb"
}
ok: [192.168.194.130] => (item=) => {
    "msg": ""
}
ok: [192.168.194.130] => (item=[mdb]) => {
    "msg": "[mdb]"
}
ok: [192.168.194.130] => (item=192.168.194.130 mysql_type=master server_id=1) => {
    "msg": "192.168.194.130 mysql_type=master server_id=1"
}
ok: [192.168.194.130] => (item=) => {
    "msg": ""
}
ok: [192.168.194.130] => (item=[sdb]) => {
    "msg": "[sdb]"
}
ok: [192.168.194.130] => (item=192.168.194.131 mysql_type=slave server_id=2) => {
    "msg": "192.168.194.131 mysql_type=slave server_id=2"
}

PLAY RECAP **********************************************************************************************************************************************************
192.168.194.130            : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

[root@clinet ansible_2]#