EPEL 是yum的一个软件源，里面包含了许多基本源里没有的软件。我们可以很容易地通过yum命令从EPEL源上获取上万个在CentOS自带源上没有的软件。EPEL提供的软件包大多基于其对应的Fedora软件包，不会与企业版Linux发行版本的软件发生冲突或替换其文件。

一、查看centos版本

[root@yj ~]# cat /etc/redhat-release
CentOS release 6.4 (Final)

二、检查系统是否安装epel-release:

[root@yj ~]#  rpm -q epel-release
package epel-release is not installed

三、安装EPEL

CentOS 用户可以直接通过 yum install epel-release 安装并启用 EPEL 源。CentOS Extras 默认包含该包。

[root@yj ~]# yum install epel-release

成功返回：

Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.sina.cn
 * extras: mirrors.sina.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:6-8 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                Arch             Version         Repository        Size
================================================================================
Installing:
 epel-release           noarch           6-8             extras            14 k

Transaction Summary
================================================================================
Install       1 Package(s)

Total download size: 14 k
Installed size: 22 k
Is this ok [y/N]: y
Downloading Packages:
epel-release-6-8.noarch.rpm                              |  14 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : epel-release-6-8.noarch                                      1/1 
  Verifying  : epel-release-6-8.noarch                                      1/1 

Installed:
  epel-release.noarch 0:6-8                                                     

Complete!

再次检查：

[root@yj ~]# rpm -q epel-release
epel-release-6-8.noarch

安装成功！

四、查看其所依附的软件文件

[root@yj ~]#  rpm -qR epel-release
/bin/sh  
/bin/sh  
config(epel-release) = 6-8
redhat-release >= 6
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1

五、导入KEY

[root@yj ~]# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

六、安装yum-priorities

[root@yj ~]# yum install yum-priorities

成功返回：

Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
 * base: mirrors.btte.net
 * extras: mirrors.sina.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
epel                                                     | 4.3 kB     00:00     
epel/primary_db                                          | 5.9 MB     00:05     
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package yum-plugin-priorities.noarch 0:1.1.30-37.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                     Arch         Version              Repository  Size
================================================================================
Installing:
 yum-plugin-priorities       noarch       1.1.30-37.el6        base        27 k

Transaction Summary
================================================================================
Install       1 Package(s)

Total download size: 27 k
Installed size: 28 k
Is this ok [y/N]: y
Downloading Packages:
yum-plugin-priorities-1.1.30-37.el6.noarch.rpm           |  27 kB     00:00     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : yum-plugin-priorities-1.1.30-37.el6.noarch                   1/1 
  Verifying  : yum-plugin-priorities-1.1.30-37.el6.noarch                   1/1 

Installed:
  yum-plugin-priorities.noarch 0:1.1.30-37.el6                                  

Complete!

查看

[root@yj ~]# cd /etc/yum.repos.d
[root@yj yum.repos.d]#  ls |grep epel
epel.repo
epel.repo~
epel-testing.repo