Ansible变量插值

Question

显然我在这里遗漏了一些东西（很明显？）:-( 字典在调试中被正确解析为 var，但我无法将其放入消息 (msg) 中。在这种情况下如何正确触发插值？（实际用例不是调试，但这是我可以构建的最简单的示例）。

---
- name: Setup based on subnet
  hosts: 
    - localhost
  vars:
    siteVars:
      10.128.0.0:
        ServerName:  "AServ"
      10.0.0.0:
        ServerName:  "BServ"
 
  tasks:
  - name: Do we get the right Network
    debug: 
      msg: "{{ ansible_default_ipv4.network }}"

  - name: Var works
    debug: 
      var: siteVars[ {{ 'ansible_default_ipv4.network' }} ].ServerName

  - name: Msg does not work interpolate
    debug:
       msg: "siteVars[ {{ 'ansible_default_ipv4.network' }} ].ServerName"

给出：

TASK [Do we get the right Network] ******************************************************************************************ok: [localhost] => {
    "msg": "10.0.0.0"
}

TASK [Var works] ******************************************************************************************ok: [localhost] => {
    "siteVars[ ansible_default_ipv4.network ].ServerName": "BServ"
}

TASK [Msg does not work interpolate] ******************************************************************************************ok: [localhost] => {
    "msg": "siteVars[ ansible_default_ipv4.network ].ServerName"
}

Answer 1

How do I trigger interpolation in this case correctly?

由于 siteVars 和 ServerName 也是数据结构（变量）的一部分，因此花括号也需要将它们括起来。

- name: Msg work interpolate too
  debug:
    msg: "{{ siteVars[ansible_default_ipv4.network].ServerName }}"

导致输出

TASK [Msg work interpolate too] ***
ok: [localhost] =>
  msg: BServ

其他相关问题在这里

How can I use Ansible nested variable?
Accessing nested variable variables in Ansible
Ansible set_fact nested variables in playboook

文档

Ansible 常见问题解答：When should I use {{ }}? How to interpolate variables or dynamic variable names?

Ansible变量插值

Ansible variable interpolation

interpolation

dictionary

ansible