# 查看当前系统可用mysql版本
yum repolist enabled | grep "mysql.*-community.*"

当前没有可用版本 

# 下载  8.0  --no-check-certificate 不需要登录
wget --no-check-certificate https://repo.mysql.com//mysql80-community-release-el7-3.noarch.rpm


# 安装mysql repo
yum localinstall mysql80-community-release-el7-3.noarch.rpm

查看可用版本

yum repolist enabled | grep "mysql.*-community.*"

安装mysql

yum install mysql-community-server

启动

systemctl start mysqld