Ansible Study - Playbooks

• Inventory 에서 정의된 호스트에서 무엇을 해야할지를 정의한 것.
• 자동화 절차를 기술한 코드 파일 코드 Set을 의미함.
• YAML 형식으로 기록
• playbook의 목표는 호스트의 그룹을 정의된 Ansible내에서 테스크로 불리는 역할(Role)에 매핑해주는 것

hosts 1개, 기본

-
    name: 'Execute two commands on localhost'
    hosts: web_node1
    tasks:
        - name: 'Execute a date command'
          command: date
            
        - name: 'Execute a command to display hosts file'
          command: 'cat /etc/hosts'       

Play name 1개 + 그룹에 속한 hosts

-
    name: 'Execute two commands on web_node1'
    hosts: "web_node1,sql_db1"
    tasks:
        -
            name: 'Execute a date command'
            command: date
        -
            name: 'Execute a command to display hosts file'
            command: 'cat /etc/hosts'

Play name 2개 + hosts 2개

-
    name: 'Execute command to display date on web_node1'
    hosts: web_node1
    tasks:
        -
            name: 'Execute a date command'
            command: date
             
-
    name: 'Execute a command to display hosts file contents on web_node2'
    hosts: web_node2
    tasks:
        -
            name: 'Execute a command to display hosts file'
            command: 'cat /etc/hosts'  

playbook 연습 - 연속적인 Task

-
    name: 'Stop the web services on web server nodes'
    hosts: web_nodes
    tasks:
        -
            name: 'Stop the web services on web server nodes'
            command: 'service httpd stop'

-
    hosts: db_nodes
    tasks:
        -
            name: 'Shutdown the database services on db server nodes'
            command: 'service mysql stop'
            
-
    hosts: all_nodes
    tasks:
        -
            name: 'Restart all servers (web and db) at once'
            command: '/sbin/shutdown -r'            
            
-
    hosts: db_nodes
    tasks:
        -
            name: 'Start the database services on db server nodes'
            command: 'service mysql start'      
            
-
    hosts: web_nodes
    tasks:
        -
            name: 'Start the web services on web server nodes'
            command: 'service httpd start'