如何访问以编程方式构造的ansible变量？

Question

我使用另外两个定义的 ansible 变量构造了一个 ansible 变量。构造变量在 vars/main.yml 中定义，我想访问 vars/main.yml 中定义的值。 vars/main.yml

---
var1_var2: "some value"

现在，我构造变量

---
- name: Construct and get the value
  hosts: localhost
  tasks:
  - include_vars: "vars/main.yml"
  - set_fact:
      variable1: "var1"
      variable2: "var2"
  - set_fact:
      final_variable: "{{ variable1 }}_{{ variable2 }}"

  - set_fact: 
      ultimate_variable: "{{ final_variable }}"

如果我运行带有 -vvv 标志的剧本，我可以看到 ultimate_variable 设置为 var1_var2 而我想获得 vars/main 中定义的值.yml 即，some value

TASK [set_fact] 

ok: [localhost] => {
"ansible_facts": {
    "variable1": "var1",
    "variable2": "var2"
},
"changed": false,
"failed": false
}

TASK [set_fact] task path: /home/ubuntu/test.yml:78

ok: [localhost] => {
"ansible_facts": {
    "final_variable": "var1_var2"
},
"changed": false,
"failed": false
}

TASK [set_fact] 

ok: [localhost] => {
"ansible_facts": {
    "ultimate_variable": "var1_var2"
},
"changed": false,
"failed": false
}

Answer 1

更新的答案：

使用查找插件进行双重替换：

ultimate_variable: "{{ lookup('vars', '{{final_variable}}') }}"

剧本：

  - include_vars: "vars/main.yml"

  - set_fact:
      variable1: "var1"
      variable2: "var2"
  - set_fact:
      final_variable: "{{ variable1 }}_{{ variable2 }}"

  - set_fact: 
      ultimate_variable: "{{ lookup('vars', '{{final_variable}}') }}"

  - debug:
      var: ultimate_variable

输出：

PLAY [localhost] ****************************************************************************************************************************************************************************************************

TASK [include_vars] *************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [set_fact] *****************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [set_fact] *****************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [set_fact] *****************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [debug] ********************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "ultimate_variable": "some value"
}

PLAY RECAP **********************************************************************************************************************************************************************************************************
localhost                  : ok=5    changed=0    unreachable=0    failed=0

希望对您有所帮助。

Answer 2

您也可以跳过中间变量定义：

 - include_vars: "vars/main.yml"

  - set_fact:
      variable1: "var1"
      variable2: "var2"

  - set_fact: 
      ultimate_variable: "{{ lookup('vars', variable1 ~ '_' ~ variable2) }}"

  - debug:
      var: ultimate_variable

如何访问以编程方式构造的ansible变量？

How to access a programmatically constructed ansible variable?

ansible

ansible-facts

ansible-inventory