ansible 列表变量、字典变量

ansible的变量不仅可以是单个的值，也可以为列表。

- hosts: localhost
  gather_facts: no
  vars:
    - list: [1,2,3]
  tasks:
    - name: echo
      debug: msg="{{ list }}"

输出为：

TASK [echo] ********************************************************************
ok: [localhost] => {
    "msg": [
        1,
        2,
        3
    ]
}

结合循环

结合循环，这个特性就变得很有用；以参数传递列表给playbook，不用在playbook中固定循环的次数与内容。

- hosts: localhost
  gather_facts: no
  vars:
    - list: [1,2,3]
  tasks:
    - name: loop
      debug: msg="{{ item }}"
      with_items: '{{list}}'

输出为：

TASK [loop] ********************************************************************
ok: [localhost] => (item=1) => {
    "item": 1,
    "msg": 1
}
ok: [localhost] => (item=2) => {
    "item": 2,
    "msg": 2
}
ok: [localhost] => (item=3) => {
    "item": 3,
    "msg": 3
}

字典变量

变量也可以为字典：

- hosts: localhost
  gather_facts: no
  vars:
    - lists:
        list1: [1,2,3]
        list2: [4,5]
  tasks:
    - name: loop
      debug: msg="{{ item }}"
      with_items: '{{lists["list1"]}}'

TASK [loop] ********************************************************************
ok: [localhost] => (item=1) => {
    "item": 1,
    "msg": 1
}
ok: [localhost] => (item=2) => {
    "item": 2,
    "msg": 2
}
ok: [localhost] => (item=3) => {
    "item": 3,
    "msg": 3
}