Centos database uninstallation and installation

Uninstall the mariadb database

查看安装信息，删除安装
rpm -qa |grep -i mysql  
yum remove MariaDB*

删除安装文件
find / -name mysql
find / -name mariadb
rm -rf  xxxxx(必须指定文件夹，使用前注意）

Delete configuration information, and log files, this step must be reinstalled

rm -rf /etc/my.cnf		删除配置
rm -rf /var/log/mysqld.log		删除日志

Install mariadb

yum install -y mariadb*

#初始化服务
systemctl start mariadb.service
systemctl enable mariadb.service

mysql_secure_installation	#(初始化：回车-->密码-->确认密码-->4连回车）
mysql -uroot -p -hlocalhost -P3306 #登入

#配置远程账户
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql>flush PRIVILEGES;