安装mariadb以及允许远程访问
[*]下载mariadb：yum -y install mariadb-server mariadb
[*]开启mariadb服务：systemctl start mariadb
[*]无密码登录mariadb：mysql
[*]查看用户表：select * from mysql.user\G
[*]添加远程访问用户：grant all on . to 'root'@'%' identified by '123456'
[*]设置添加用户的授权权限：update mysql.user set Grant_priv='Y' where Host='%'
[*]移除匿名用户：delete from mysql.user where Host<>'%' or User<>'root'
[*]重启mariadb：systemctl restart mariadb
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