centos7 mysql数据库安装
#yum install mysql
#yum install mysql-server
#yum install mysql-devel
安装mysql-server可能会失败，可以尝试官网下载安装mysql-server
# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server
安装成功后重启mysql服务。
# service mysqld restart