一、mysql5.7在线安装
1、下载并安装MySQL官方的Yum Repository
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm/
2、下载yum源
yum -y install mysql57-community-release-el7-10.noarch.rpm
3、开始安装MySQL服务器
yum -y install mysql-community-server
4、启动
systemctl start mysqld.service