五月学习之Ansible Register

四、Ansible Register

1、什么是Register

register 可以将 task 执行的任务结果存储至某个变 量中，便于后续的引用；

例1获取被控节点的端口信息

cat f5.yml
---
- hosts: all
  tasks:
    - name:
      shell: netstat -lntp
      register: System_Status
    - name: Get System Status
      debug: msg={{System_Status.stdout_lines}}

例2批量修改主机名称

cat te_2.yaml
- hosts: all
  tasks:
    - name: #定义一个随机数，设定为变量，然后后续调用
      shell: echo $((RANDOM%200))
      register: System_SJ
    - name: #使用debug输出变量结果，这样好知道需要提取的关键值
      debug: msg={{ System_SJ }}
    - name: #使用hostname模块将主机名修改为web_随机数
      hostname: name=web_{{System_SJ.stdout }}

例3jumpserver key 的创建

if [ ! "$BOOTSTRAP_TOKEN" ]; then
  BOOTSTRAP_TOKEN=`cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 16`;
  echo "BOOTSTRAP_TOKEN=$BOOTSTRAP_TOKEN"
>> ~/.bashrc;
  echo $BOOTSTRAP_TOKEN;
else
  echo $BOOTSTRAP_TOKEN;
fi

cat f9.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 $SECRET_KEY;
              fi'
      register: SECRET_KEY
    - name: Run Shell CommandBOOTSTRAP_TOKEN
      shell:
        cmd: 'if ! grep "BOOTSTRAP_TOKEN" ~/.bashrc; then
                BOOTSTRAP_TOKEN=`cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 16`;
                echo "BOOTSTRAP_TOKEN=$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] }}