MySQL Installation and Hardening on CentOS RHEL 7

[root@lakshmi~]# mysql_secure_installation



NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!

In order to log into MySQL to secure it, we'll need the current
password for the root user. If you've just installed MySQL, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)

I love this .. just fantastic

am getting error please help me on this
/usr/share/mysql/mysql-log-rotate from install of mysql-community-server-5.7.19-1.el7.x86_64 conflicts with file from package MariaDB-server-10.2.7-1.el7.centos.x86_64