获取源

wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm

增加源

yum localinstall mysql57-community-release-el7-7.noarch.rpm

安装mysql

yum install mysql-community-server

启动数据库

 systemctl start  mysqld.service

安装完了root密码在mysql的log中，进入到/var/log目录中

more mysqld.log | grep "temporary password is generated"

这时候就会出现mysql root的初始密码了。。。记得更改一下