在Ansible中遍历两个列表

可以使用with_nested或with_cartesian这两个循环控制结构。

with_nested：用于遍历两个嵌套的列表，并逐个取出其中的元素进行操作。示例代码如下：

- name: Example using with_nested
  debug:
    msg: "Outer item: {{ item.0 }}, Inner item: {{ item.1 }}"
  with_nested:
    - [1, 2, 3]
    - ['a', 'b', 'c']

上述代码会输出如下结果：

TASK [Example using with_nested] *************************************************************************************
ok: [localhost] => (item=[1, 'a']) => {
    "msg": "Outer item: 1, Inner item: a"
}
ok: [localhost] => (item=[1, 'b']) => {
    "msg": "Outer item: 1, Inner item: b"
}
ok: [localhost] => (item=[1, 'c']) => {
    "msg": "Outer item: 1, Inner item: c"
}
ok: [localhost] => (item=[2, 'a']) => {
    "msg": "Outer item: 2, Inner item: a"
}
ok: [localhost] => (item=[2, 'b']) => {
    "msg": "Outer item: 2, Inner item: b"
}
ok: [localhost] => (item=[2, 'c']) => {
    "msg": "Outer item: 2, Inner item: c"
}
ok: [localhost] => (item=[3, 'a']) => {
    "msg": "Outer item: 3, Inner item: a"
}
ok: [localhost] => (item=[3, 'b']) => {
    "msg": "Outer item: 3, Inner item: b"
}
ok: [localhost] => (item=[3, 'c']) => {
    "msg": "Outer item: 3, Inner item: c"
}

with_cartesian：用于对两个列表进行笛卡尔积操作，生成一个元素为元组的列表。示例代码如下：

- name: Example using with_cartesian
  debug:
    msg: "Combination: {{ item }}"
  with_cartesian:
    - [1, 2, 3]
    - ['a', 'b', 'c']

上述代码会输出如下结果：

TASK [Example using with_cartesian] **********************************************************************************
ok: [localhost] => (item=[1, 'a']) => {
    "msg": "Combination: [1, 'a']"
}
ok: [localhost] => (item=[1, 'b']) => {
    "msg": "Combination: [1, 'b']"
}
ok: [localhost] => (item=[1, 'c']) => {
    "msg": "Combination: [1, 'c']"
}
ok: [localhost] => (item=[2, 'a']) => {
    "msg": "Combination: [2, 'a']"
}
ok: [localhost] => (item=[2, 'b']) => {
    "msg": "Combination: [2, 'b']"
}
ok: [localhost] => (item=[2, 'c']) => {
    "msg": "Combination: [2, 'c']"
}
ok: [localhost] => (item=[3, 'a']) => {
    "msg": "Combination: [3, 'a']"
}
ok: [localhost] => (item=[3, 'b']) => {
    "msg": "Combination: [3, 'b']"
}
ok: [localhost] => (item=[3, 'c']) => {
    "msg": "Combination: [3, 'c']"
}

这些方法可以帮助我们在Ansible中同时遍历两个列表，并进行相关操作。对于更复杂的场景，Ansible还提供了其他循环控制结构和过滤器，可根据具体需求选择适合的方法。