优化-debug模块去确认返回结果的数据结构 - setup模块执行原理 +ansible执行过程 + 异步-同步

1.通过debug模块去确认返回结果的数据结构

获取Task任务结果
- name: check nginx syntax
  shell: /usr/sbin/nginx -t
  register: nginxsyntax

通过debug模块去确认返回结果的数据结构
- name: print nginx syntax result
  debug: var=nginxsyntax

"nginxsyntax": {
        "changed": true,
        "cmd": "/usr/sbin/nginx -t",
        "delta": "0:00:00.012045",
        "end": "2017-08-12 20:19:04.650718",
        "rc": 0,
        "start": "2017-08-12 20:19:04.638673",
        "stderr": "nginx: the configuration file /etc/nginx/nginx.conf syntax is ok\nnginx: configuration file /etc/nginx/nginx.conf test is successful",
        "stderr_lines": [
            "nginx: the configuration file /etc/nginx/nginx.conf syntax is ok",
            "nginx: configuration file /etc/nginx/nginx.conf test is successful"
        ],
        "stdout": "",
        "stdout_lines": []
    }

2.我的debug

---
- name: a template example
  hosts: frame
  remote_user: root
  tasks:
    - name: max login try count
      shell: egrep -i 'MaxAuthTries'  /etc/ssh/sshd_config |awk '{print $2}'
      register: try_count
    - name: echo last shell result var
      debug: var=try_count

    - name: echo last shell result
      debug:
        msg: "{{ try_count['stdout_lines'] }}"

TASK [max login try count] *************************************************************************************************************************
changed: [10.0.0.4]TASK [echo last shell result var] ******************************************************************************************************************
ok: [10.0.0.4] => {
    "try_count": {
        "changed": true,
        "cmd": "egrep -i 'MaxAuthTries'  /etc/ssh/sshd_config |awk '{print $2}'",
        "delta": "0:00:00.050398",
        "end": "2020-10-27 21:05:05.333621",
        "failed": false,
        "rc": 0,
        "start": "2020-10-27 21:05:05.283223",
        "stderr": "",
        "stderr_lines": [],
        "stdout": "6",
        "stdout_lines": [
            "6"
        ]
    }
}TASK [echo last shell result] **********************************************************************************************************************
ok: [10.0.0.4] => {
    "msg": [
        "6"
    ]
}

 3.Ansible中setup模块的执行过程，它是将setup模块的python脚本拷贝到ansible管控主机，

   然后在管控主机上执行python脚本获取主机基本信息，在返回给ansible。
   查看执行setup的主机，看到执行的python进程处于D状态。  

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# 将要执行的任务放到临时文件中，并使用sftp将任务文件传输到被控节点上 

用一个例子来演示会更加清晰