ansible - 在ansible中从until循环打印自定义消息

Question

我试图多次运行一个命令并检查输出中是否包含一些字符串(“hi”)。我故意模拟失败并期待 until循环失败。到目前为止一切都很好。

现在，我需要一些自定义消息说明为什么 until循环或 task失败的。例如:"Your command failed to print hi"
所以问题是 , 如果循环无法通过重试，我如何从直到循环打印自定义消息。

剧本:

-->cat until.yml
---

- hosts: localhost
  gather_facts: no
  tasks:

    - name: "check command"
      shell: echo hello
      register: var
      until: var.stdout.find('hi') != -1
      retries: 5
      delay: 1

剧本输出:

 -->ansible-playbook until.yml
PLAY [localhost] *************************************************************************************************************************************************************************************************************************

TASK [check command] ********************************************************************************************************************************************************************************************************
FAILED - RETRYING: who triggered the playbook (5 retries left).
FAILED - RETRYING: who triggered the playbook (4 retries left).
FAILED - RETRYING: who triggered the playbook (3 retries left).
FAILED - RETRYING: who triggered the playbook (2 retries left).
FAILED - RETRYING: who triggered the playbook (1 retries left).
fatal: [localhost]: FAILED! => {
    "attempts": 5,
    "changed": true,
    "cmd": "echo hello",
    "delta": "0:00:00.003004",
    "end": "2019-12-03 10:04:14.731488",
    "rc": 0,
    "start": "2019-12-03 10:04:14.728484"
}

STDOUT:

hello


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

Answer 1

您可以将您的任务分为两个任务:

第一个任务将使用 until 轮询所需的输出环形。但是我们用过ignore_errors: True ，所以 until循环不会使剧本失败。我们将只捕获结果。

在第二个任务中，使用 assert打印 success_msg成功案例和 fail_msg对于失败的情况。

以下是经过调整的，最小工作示例:

---

- hosts: localhost
  gather_facts: no
  tasks:

    - name: "check command"
      shell: echo hello
      register: var
      until: var.stdout.find('hi') != -1
      retries: 5
      delay: 1
      ignore_errors: true

    - name: "Print result"
      assert:
        that: var.stdout|regex_search('hi')
        fail_msg: "COuld not find HI in command output"
        success_msg: "Hi is present in Command output"