ansible register 无视when 条件执行

先来看一段ansible代码:

- name: test
  hosts: localhost
  gather_facts: no
  vars:
    test_name: 'real_name'
    flag: false
  tasks:
    - name: retrieve node's hostname
      shell: "hostname"
      register: test_name
      when: flag | bool

    - debug:
        var: test_name

正常来说,我们认为会输出结果会是’real_name’,因为第一个任务因为when的条件判断并没有执行

但是,结果是什么呢?

ansible-playbook 1.yaml
 [WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'


PLAY [test] *************************************************************************************************************************************************************************

TASK [retrieve node's hostname] *****************************************************************************************************************************************************
skipping: [localhost]

TASK [debug] ************************************************************************************************************************************************************************
ok: [localhost] => {
    "test_name": {
        "changed": false,
        "skip_reason": "Conditional result was False",
        "skipped": true
    }
}

PLAY RECAP **************************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0

并没有,难道是skip了?其实并没有skip, 而是第一个task的register讲test_name的值赋值成了如下三行:

“changed”: false,
“skip_reason”: “Conditional result was False”,
“skipped”: true

也就是说,尽快when的条件没有判断成功,但是register还会工作

具体的变通办法参见

https://stackoverflow.com/questions/34621799/ansible-how-do-i-avoid-registering-a-variable-when-a-when-condition-is-not

原文出处:503error -> https://www.503error.com/2019/ansible-register-%E6%97%A0%E8%A7%86when-%E6%9D%A1%E4%BB%B6%E6%89%A7%E8%A1%8C/1580.html

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