yum install mysql56

官方有写：

http://dev.mysql.com/doc/mysql-repo-excerpt/5.6/en/linux-installation-yum-repo.html

yum update 
#数据库服务器的安装 , 请自行在mysql官方找最新的rpm
rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el6-5.noarch.rpm
yum install mysql-server