Question

以下代码结果'dict object' has no attribute 'failed'错误：

shell模块：

- hosts: localhost
  tasks:
    - shell: "not_available_command"
      register: module_result
      until: module_result.failed == false
      retries: 2
      delay: 1

结果：

fatal: [localhost]: FAILED! => {
"failed": true, 
"msg": "The conditional check 'module_result.failed == false' failed. The error was: error while evaluating conditional (module_result.failed == false): 'dict object' has no attribute 'failed'"

}

但是当我将until的语法更改为：

时

      until: module_result.stderr == ""

成功重试。我用-vvv选项执行它来进行调试;在2次重试后，它按预期失败：

fatal: [localhost]: FAILED! => {
"attempts": 2, 
"changed": true, 
"cmd": "not_available_command", 
"delta": "0:00:00.010290", 
"end": "2017-09-25 17:28:14.078318", 
"failed": true, 
"invocation": {
    "module_args": {
        "_raw_params": "not_available_command", 
        "_uses_shell": true, 
        "chdir": null, 
        "creates": null, 
        "executable": null, 
        "removes": null, 
        "warn": true
    }
}, 
"rc": 127, 
"start": "2017-09-25 17:28:14.068028", 
"stderr": "/bin/sh: 1: not_available_command: not found", 
"stderr_lines": [
    "/bin/sh: 1: not_available_command: not found"
], 
"stdout": "", 
"stdout_lines": []

}

如前所述，failed或stderr属性均已存在，但在尝试定义failed语法时无法识别until。

让我们尝试使用不同的模块：

get_url module：

- hosts: localhost
  tasks:
    - get_url:
        url: "http://unavailable_file_on_the_web.txt"
        dest: "{{ playbook_dir }}"
      register: module_result
      until: module_result.failed == false
      retries: 2
      delay: 1

此时until: module_result.failed == false语法有效; 'failed'属性已被识别。

那么如何在模块上识别这个问题呢？它似乎是一个错误吗？

Answer 1

是的，它似乎是一个错误或预期的行为：failed字段在中间尝试期间未填充。您可以使用ANSIBLE_DEBUG=1：

进行检查

{
  "changed": true,
  "end": "2017-09-25 13:01:17.269225",
  "stdout": "",
  "cmd": "not_available_command",
  "rc": 127,
  "start": "2017-09-25 13:01:17.257604",
  "stderr": "/bin/sh: not_available_command: command not found",
  "delta": "0:00:00.011621",
  "invocation": {
    "module_args": {
      "warn": true,
      "executable": null,
      "_uses_shell": true,
      "_raw_params": "not_available_command",
      "removes": null,
      "creates": null,
      "chdir": null
    }
  },
  "warnings": []
}

在Ansible 2.4中，failed字段存在。

有关failed / succeeded的{{3}}，请提供相关信息您可以在when/until语句中使用它们：

until: module_result | succeeded

这在2.2.x和2.3.x中运行良好。

Ansible shell模块无法识别失败任务的“失败”属性

1 个答案: