Linux 安装扩展yum源
下载rpm扩展：http://rpmfind.net/linux/epel/6/x86_64/epel-release-6-8.noarch.rpm
CentOS/RHEL 5 ： rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-5.noarch.rpm CentOS/RHEL 6 ： rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm CentOS/RHEL 7 ： rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm