[root@VM-4-2-centos lib]# systemctl stop mysqld
[root@VM-4-2-centos lib]#
[root@VM-4-2-centos lib]#
[root@VM-4-2-centos lib]# systemctl status mysqld
[root@VM-4-2-centos lib]# systemctl disable mysqld
yum remove mysql mysql-server mysql-libs mysql-common
rm -rf /var/lib/mysql
rm -rf /etc/my.cnf