Centos7下mariadb忘记root密码处理

   1，停止mariadb服务

          systemctl stop mariadb

        2，修改配置文件 vim /etc/my.cnf
            在[mysqld]下添加skip-grant-tables
            意思是忽略密码， 保存并退出

        3，启动Mariadb
         systemctl start mariadb

         4，修改密码
            mysql
use mysql;
UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ;
            flush privileges ;
            quit

        5，改回配置，重启服务
vim /etc/my.cnf 删除skip-grant-tables
           systemctl restart mariadb

            6 ，进入数据库
              mysql -uroot -p
                输入新密码new-password即可

                参考https://blog.csdn.net/linux_s2018/article/details/80762820