centos yum 安装 mysql 5.6 or 5.7
mysql 有yum 对应的仓库，先添加仓库网页地址 http://dev.mysql.com/downloads/repo/yum/Guide http://dev.mysql.com/doc/mysql-yum-repo-quick-guide/en/对应的mysql版本 http://repo.mysql.com//mysql57-community-release-el6-8.noar
