2:在/etc/yum.repos.d 目录下安装yum源：
Rpm –ivh mysql57-community-release-el7-8.noarch.rpm
3:更新yum源：
Yum clean all
Yum makecache
Yum update
4:退到根目录，查找可以安装的mysql 源：
Yum search mysql
5:安装mysql:
Yum install –y mysql mysql-community-server.x86_64
(安装时老是提示faild,no such morror,可以重复第3步，多试几次)
6:更改密码：
/usr/bin/mysqladmin –u root password ‘1qqqq123.’
(这适用于mysql 5.7以下版本)原文：https://blog.51cto.com/wusongyuanxing1/2437375