1.下载mysql的repo源

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

2.安装mysql-community-release-el7-5.noarch.rpm包

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

安装这个包后，会获得两个mysql的yum repo源：/etc/yum.repos.d/mysql-community.repo，/etc/yum.repos.d/mysql-community-source.repo。

3.安装mysql

sudo yum install mysql-server

4.授权运行

sudo chmod -R 777 /var/lib/mysql

5.授权归属root

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

6.重启mysql服务

service mysqld restart

7.查看启动状态

service mysqld status

8.重置mysql密码

mysql -u root 
回车进入mysql控制台
mysql > use mysql;
mysql > ALTER USER 'root'@'localhost' identified by '123456' ; 
mysql > flush privileges;
mysql > exit;