rpm -qa | grep mysql

rpm -e --nodeps 

whereis mysql

find / -name mysql

rm -rf 

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

rpm -ivh mysql-community-release-el7-5.noarch.rpm

yum update

yum install mysql-server

chown mysql:mysql -R /var/lib/mysql

mysqld --initialize

systemctl start mysqld

systemctl status mysqld

mysqladmin --version

mysqladmin -u root password "new_password";

mysql -u root -p