ansible register 无视when 条件执行 | 张志明的个人博客

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

- name: test

hosts: localhost

gather_facts: no

vars:

test_name: 'real_name'

flag: false

tasks:

- name: retrieve node's hostname

shell: "hostname"

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

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 **************************************************************************************************************************************************************************