Ansible 处理程序 - 不是从救援块调用

Question

考虑以下（为简洁起见进行了简化）带有块和救援块的剧本

- name: deploy block
  block:
  - name: debug meta
    debug: var=meta

  
  - name: create/update configmap with new data
    k8s:
      state: present
      namespace: "{{ namespace }}"
      definition: "{{ lookup('template', 'configmap.tpl.yml') }}"
      kind: ConfigMap
    notify:
      - successfull_deployment_slack_handler
  rescue:
    - name: Something went wrong handler
      debug:
        msg: "Something has failed in the playbook"
      notify: failure_deployment_slack_handler
- meta: flush_handlers

在快乐的路径中测试这个工作并按预期调用处理程序。
但是当我在测试中失败时，我确实看到了预期的调试消息，但实际的处理程序没有被调用（我已经将它换成调试消息来验证）。

是的，我试过添加 meta: flush_handlers。

我怎样才能使这个工作？

Ansible 版本：2.9.9

Answer 1

处理程序仅在更改时调用，任务 meta: flush_handlers 将执行处理程序 只有当 首先有要刷新的处理程序时，这不是你的情况。

As we’ve mentioned, modules should be idempotent and can relay when they have made a change on the remote system. Playbooks recognize this and have a basic event system that can be used to respond to change.

^{来源：https://docs.ansible.com/ansible/latest/user_guide/playbooks_intro.html#handlers-running-operations-on-change，重点，我的}

为了让它工作，您将不得不以某种方式创建一个改变的状态。这可能是通过使用 changed_when:

- name: deploy block
  block:
  - name: debug meta
    debug: var=meta

  
  - name: create/update configmap with new data
    k8s:
      state: present
      namespace: "{{ namespace }}"
      definition: "{{ lookup('template', 'configmap.tpl.yml') }}"
      kind: ConfigMap
    notify:
      - successfull_deployment_slack_handler
  rescue:
    - name: Something went wrong handler
      debug:
        msg: "Something has failed in the playbook"
      changed_when: true
      notify: failure_deployment_slack_handler
- meta: flush_handlers

_相关：

Answer 2

你的精简版剧本中的 'error' 是 debug 永远不会向 ansible 报告 changed，因此，处理程序不会触发。

在我用 shell 替换你的 rescue debug 的剧本中，处理程序称为

---
- hosts: all
  handlers:
    - name: handler
      debug:
        msg: handler
  tasks:
    - name: deploy block
      block:
      - name: debug meta
        debug:
          msg: in the block

      - fail:
          msg: failing
      rescue:
        - name: Something went wrong handler
          shell: date
          notify: handler

结果

TASK [debug meta] **************************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": "in the block"
}

TASK [fail] ********************************************************************************************************************************************************************************************************************************************************************
fatal: [localhost]: FAILED! => {"changed": false, "msg": "failing"}

TASK [Something went wrong handler] ********************************************************************************************************************************************************************************************************************************************
changed: [localhost]

RUNNING HANDLER [handler] ******************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": "handler"
}

Ansible 处理程序 - 不是从救援块调用

Ansible handler - not called from rescue block

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ansible-handlers