EPEL 是 Extra Packages for Enterprise Linux 的缩写（EPEL），是用于 Fedora-based Red Hat Enterprise Linux (RHEL) 的一个高质量软件源EPEL(http://fedoraproject.org/wiki/EPEL) 是由 Fedora 社区打造，为 RHEL 及衍生发行版如 CentOS、Scientific Linux 等提供高质量软件包的项目。

安装EPEL源

官方源直接安装

rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

国内的往往速度会更快

#中科大镜像源 高质量源
rpm -Uvh http://mirrors.ustc.edu.cn/centos/7.0.1406/extras/x86_64/Packages/epel-release-7-5.noarch.rpm
 
#浙大源 也非常不错
rpm -Uvh http://mirrors.zju.edu.cn/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
 
#上海交大源，更新比较快
rpm -Uvh http://ftp.sjtu.edu.cn/fedora/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

#还有东北的活雷锋东软的源，最近有些抽风，经常打不开
http://mirrors.neusoft.edu.cn/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

#sohu镜像源，更新比较慢 
rpm -Uvh http://mirrors.sohu.com/fedora-epel/7/x86_64/e/epel-release-7-2.noarch.rpm

这是来自官方公布的数据（2015-01-28）

http://mirrors.fedoraproject.org/publiclist/EPEL/7/x86_64/#CN

配置EPEL源

vi /etc/yum.repos.d/epel.repo

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 7 - $basearch - Debug
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

[epel-source]
name=Extra Packages for Enterprise Linux 7 - $basearch - Source
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

vi /etc/yum.repos.d/epel-testing.repo

[epel-testing]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

[epel-testing-debuginfo]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch - Debug
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/$basearch/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-debug-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

[epel-testing-source]
name=Extra Packages for Enterprise Linux 7 - Testing - $basearch - Source
baseurl=http://ftp.sjtu.edu.cn/fedora/epel/testing/7/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=testing-source-epel7&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
gpgcheck=1

这是已经替换好上海交大源的文件，如果想使用中科大的，请用http://mirrors.ustc.edu.cn/来替换http://ftp.sjtu.edu.cn/fedora/就可。其它以此来推。

检查源是否已添加

yum repolist

运行命令生成缓存

yum clean all && yum makecache

选择速度最快的yum源

yum安装插件yum-plugin-fastestmirror

yum install yum-plugin-fastestmirror