1.1MySQL安装1.1.1下载wget命令yum-yinstallwget1.1.2在线下载mysql安装包wgethttps://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm1.1.3安装MySQLrpm-ivhmysql57-community-release-el7-8.noarch.rpm1.1.4安装mysql服务首先进入cd/etc/yum.repos.d/目录。cd/etc/yum.repos.d/安装MySQL服务（这个过程可能有点慢）rpm--importhttps://repo.mysql.co
