ansible系列(21)--ansible的变量注册Register

1. 变量注册Register

register 关键字可以将某个 task 任务结果存储至变量中，最后使用 debug模块 输出变量内容，可以用于后续排障；

• 示例一：register的基本使用：

  #playbook文件：
  [root@xuzhichao ansible_var]# cat test7.yml
  ---
  - hosts: 192.168.20.23
    remote_user: root
  
    tasks:
      - name: Shell Command
        shell: netstat -ntlp
        register: port_status
  
      - name: Get Port Status
        debug: msg={{ port_status.stdout_lines }}  <==stdout_lines作用是只输出命令的内容。
  

  #运行playbook：
  [root@xuzhichao ansible_var]# ansible-playbook test7.yml 
  
  PLAY [192.168.20.23] *****************************************************************************************************************************************
  
  TASK [Gathering Facts] ***************************************************************************************************************************************
  ok: [192.168.20.23]
  
  TASK [Shell Command] *****************************************************************************************************************************************
  changed: [192.168.20.23]
  
  TASK [Get Port Status] ***************************************************************************************************************************************
  ok: [192.168.20.23] => {
      "msg": [
          "Active Internet connections (only servers)",
          "Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    ",
          "tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      668/rpcbind         ",
          "tcp        0      0 0.0.0.0:20048           0.0.0.0:*               LISTEN      15615/rpc.mountd    ",
          "tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      8981/nginx: master  ",
          "tcp        0      0 0.0.0.0:40372           0.0.0.0:*               LISTEN      -                   ",
          "tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1112/sshd           ",
          "tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1288/master         ",
          "tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      8981/nginx: master  ",
          "tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN      -                   ",
          "tcp        0      0 0.0.0.0:55651           0.0.0.0:*               LISTEN      1122/rpc.statd      ",
          "tcp6       0      0 :::111                  :::*                    LISTEN      668/rpcbind         ",
          "tcp6       0      0 :::40688                :::*                    LISTEN      -                   ",
          "tcp6       0      0 :::20048                :::*                    LISTEN      15615/rpc.mountd    ",
          "tcp6       0      0 :::56211                :::*                    LISTEN      1122/rpc.statd      ",
          "tcp6       0      0 :::22                   :::*                    LISTEN      1112/sshd           ",
          "tcp6       0      0 ::1:25                  :::*                    LISTEN      1288/master         ",
          "tcp6       0      0 :::2049                 :::*                    LISTEN      -                   "
      ]
  }
  
  PLAY RECAP ***************************************************************************************************************************************************
  192.168.20.23              : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
  

• 示例二：使用 register 关键字完成 jumpserver key 的创建；

  [root@xuzhichao ansible_var]# cat test8.yaml
  - hosts: webservers
    tasks: 
  
    - name: Run Shell Command Random string
      shell:
        cmd: 'if ! grep "SECRET_KEY" ~/.bashrc; then
                SECRET_KEY=`cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 50`;
                echo "SECRET_KEY=$SECRET_KEY" >> ~/.bashrc;
                echo $SECRET_KEY;
              else
                echo $SECRET_KEY;
              fi'
       register: SECRET_KEY 
  
     - name: Run Shell Command BOOTSTRAP_TOKEN
       shell:
         cmd: 'if ! grep "BOOTSTRAP_TOKEN" ~/.bashrc; then
                 BOOTSTRAP_TOKEN=`cat /dev/urandom | tr -dc A-Za- z0-9 | head -c 16`;
                 echo "BOOTSTRAP_TOKEN=$BOOTSTRAP_TOKEN" >> ~/.bashrc;
                 echo $BOOTSTRAP_TOKEN;
               else
                 echo $BOOTSTRAP_TOKEN;
               fi'
       register: BOOTSTRAP_TOKEN
  
     - name: Copy Jms Configure
       template:
         src: ./j-config.yml
         dest: /tmp/jms_config.yml
  
     - name: Copy Koko Configure
       template:
         src: ./k-config.yml
         dest: /tmp/koko_config.yml
  
  # 配置文件中：
  SECRET_KEY: {{ SECRET_KEY.stdout.split('=')[1] }}
  BOOTSTRAP_TOKEN: {{ BOOTSTRAP_TOKEN.stdout.split('=')[1] }}