ansible 列表變量、字典變量

ansible的變量不僅可以是單個的值，也可以為列表。

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

輸出為：

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

結合循環

結合循環，這個特性就變得很有用；以參數傳遞列表給playbook，不用在playbook中固定循環的次數與內容。

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

輸出為：

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
}

字典變量

變量也可以為字典：

- 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
}