OS:Centos 7 Linux 3.10.0-229.el7.x86_64
MySQL: mysql57-community-release-el7-7.noarch.rpm
mysql57-community-release-el7-7.noarch.rpm
I installed MySQL server
For me the above answer did not help, so here is my solution.
Find out open mysqld process
ps -ef | grep mysqld
And kill all those process
pkill -9 mysqld
Finally start it the same by using
systemctl start mariadb
Issue resolved....