Ansible:在基于 stdout 值的异步任务上执行 failed_when:

问题描述

我正在尝试根据来自标准输出的值对异步任务执行 failed_when:.

I am trying to perform a failed_when: on an async task based on a value from stdout.

这是我的任务:

  - name: RUN SOME TASK LOCALLY
    command: <run_some_script_here>.sh
             chdir=/task_folder/
    delegate_to: localhost
    register: task_status
    async: 3600
    poll: 0

这是我检查任务状态的地方，并希望它在指定文本在标准输出中时失败.

This is where I check on the task status and would like it to fail when the specified text is in stdout.

 - name: CHECK TASK PROGRESS
   async_status: jid={{ task_status.ansible_job_id }}
   register: poll_status
   until: poll_status.finished
   retries: 100
   failed_when: "'ERROR. TASK FAILED.' in poll_status.stdout"

当我运行上述剧本时，我遇到了 Ansible 的以下错误

When I run the above playbook I am faced with the following error from Ansible

TASK [CHECK TASK PROGRESS] ************************************************* 
fatal: [localhost]: FAILED! => {"failed": true, "msg": "The conditional check ''ERROR. TASK FAILED.' in poll_status.stdout' failed. The error was: error while evaluating conditional ('ERROR. TASK FAILED.' in poll_status.stdout): Unable to look up a name or access an attribute in template string ({% if 'ERROR. TASK FAILED.' in poll_status.stdout %} True {% else %} False {% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"}

推荐答案

你可以帮助 ansible 避免由于未定义的变量导致模板崩溃.
像这样改变fail_when::

You may help ansible to avoid templating crash because of undefined variable.
Change fail_when: like this:

failed_when: "poll_status.stdout is defined and 'ERROR' in poll_status.stdout"

如果第一次轮询任务未完成作业，则 stdout 尚未填充，因此未定义，导致模板引擎崩溃.

If job is not finished by the first run of polling task, stdout is not yet populated and thus undefined, causing templating engine to crash.

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