方法一下载安装：
1、在/home创建mysql目录，下载如下四个软件包
http://mirrors.sohu.com/mysql/MySQL-5.7/
wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-community-client-5.7.18-1.el6.x86_64.rpm
wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-community-common-5.7.18-1.el6.x86_64.rpm
wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-community-libs-5.7.18-1.el6.x86_64.rpm
wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-community-server-5.7.18-1.el6.x86_64.rpm
2、检查mysql rpm相关的包是否安装并去除
[root@centos-6 mysql]# rpm -qa | grep -i mysql
mysql-libs-5.1.73-8.el6_8.x86_64
[root@centos-6 mysql]# rpm -e mysql-libs-5.1.73-8.el6_8.x86_64
error: Failed dependencies:
libmysqlclient.so.16()(64bit) is needed by (installed) postfix-2:2.6.6-8.el6.x86_64
libmysqlclient.so.16(libmysqlclient_16)(64bit) is needed by (installed) postfix-2:2.6.6-8.el6.x86_64
mysql-libs is needed by (installed) postfix-2:2.6.6-8.el6.x86_64
[root@centos-6 mysql]#
将依赖包一并删除
[root@centos-6 mysql]# yum remove -y mysql-libs
再次查询是否删除干净
[root@centos-6 mysql]# rpm -qa | grep -i mysql
[root@centos-6 mysql]#
3、同时安装这三个rpm包
rpm -ivh mysql-community-client-5.7.18-1.el6.x86_64.rpm mysql-community-common-5.7.18-1.el6.x86_64.rpm mysql-community-libs-5.7.18-1.el6.x86_64.rpm
方法二yum安装：
首先要到MySQL yum库的下载页面http://dev.mysql.com/downloads/repo/yum/
下载：mysql57-community-release-el7-11.noarch.rpm
安装：rpm -Uvh mysql57-community-release-el7-9.noarch.rpm
yum安装server：
yum install mysql-community-server
yum安装client：
yum install mysql-community-client
http://blog.csdn.net/Holmofy/article/details/69364800