mysqld_safe --defaults-file=/etc/my.cf
chown -R mysql:mysql /var/lib/mysql
/etc/init.d/mysqld start
/etc/init.d/mysqld stop
systemctl restart systemd-logind
/etc/init.d/mysql stop
service mysql stop
killall -KILL mysql mysqld_safe mysqld
/etc/init.d/mysql start
service mysql start