1，编写mariadb.yaml文件

[ ansible]# vim mariadb.yaml---
    - hosts: mariadb
      remote_user: root
      tasks:
        - name: install mariadb
          yum: name=mariadb-server state=present
        - name: start mariadb
          service: name=mariadb state=restarted enabled=true

2，检查mariadb.yaml文件语法是否正确