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

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

yum install mysql-community-server

service mysqld restart

mysql -u root
mysql> set password for ‘root‘@‘localhost‘ =password(‘vm_52.102‘);    

[root@localhost liuhui]# service mysqld restart
Redirecting to /bin/systemctl restart  mysqld.service
[root@localhost liuhui]# mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.34 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> set password for ‘root‘@‘localhost‘ =password(‘password‘);
Query OK, 0 rows affected (0.00 sec)