EPEL 的软件包通常不会与企业版Linux官方源中的软件包发生冲突，或者互相替换文件。EPEL与Fedora项目基本一致，包含完整的构建系统、升级管理器、镜像管理器等等。
EPEL 包含一个叫做epel-release的包，这个包包含了EPEL源的gpg密钥和软件源信息。您可以通过yum安装到您的企业版Linux发行版上。除了epel-release源，还有一个叫做epel-testing的源，这个源包含最新的测试软件包，其版本很新但是安装有风险，请自行斟酌。
注意: 有些第三方软件源需要 EPEL 的'epel-testing'源来安装依赖组件，请务必在系统设置中启用本源。 这里 有相关的开启教程。(相关配置文件位于：/etc/yum.repos.d/epel-testing.repo)。
1.首先检查系统是否安装epel-release
[root@localhost ~] # rpm -q epel-release package epel-release is not installed
2.安装EPEL
[root@localhost ~]# rpm -ivh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm Retrieving http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm Preparing... ########################################### [100%] 1:epel-release ########################################### [100%]
注意：
1、 要安装最新版本的EPEL，请前往 http://mirrors.ustc.edu.cn/fedora/epel/ 中查找最新版本的URL地址，这里采用的是6.8版本
32位：http://mirrors.ustc.edu.cn/fedora/epel/6/i386/epel-release-6-8.noarch.rpm
64位：http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
2、若出现下面类似错误，则表示对应的URL已经不存在，需要重新找EPEL的版本，请前往 http://mirrors.ustc.edu.cn/fedora/epel/ 获取需要的版本
[root@localhost ~]# rpm -ivh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm Retrieving http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm curl: (22) The requested URL returned error: 404 Not Found error: skipping http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm - transfer failed
#2.1 安装成功
[root@localhost ~]# rpm -q epel-release epel-release-6-8.noarch
#2.2 查看其所依附的软件文件
[root@localhost ~]# 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
#2.3 卸载
[root@localhost ~]# rpm -e epel-release warning: /etc/yum.repos.d/epel.repo saved as /etc/yum.repos.d/epel.repo.rpmsave
#2.4 设置源级别
[root@localhost ~]# vi /etc/yum.repos.d/epel.repo 设置 /etc/yum.repos.d/epel.repo 中源的级别为 priority=11
#2.5 搜索软件包
若要查看 EPEL Repo 中是否存在某个软件包：yum search package-name，若搜索git
[root@localhost ~]# yum search git
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.hust.edu.cn
* extras: mirrors.aliyun.com
* updates: mirror.bit.edu.cn
============================== N/S Matched: git ===============================
nodejs-github-url-from-git.noarch : Parse a GitHub git URL and return the GitHub repository URL
php-phpunit-git.noarch : Simple wrapper for Git
trac-git-plugin.noarch : GIT version control plugin for Trac
GitPython.noarch : Python Git Library
cgit.x86_64 : A fast web interface for git
git-annex.x86_64 : Manage files with git, without checking their contents into git
git-ftp.noarch : Git powered FTP client written as shell script
git-gui.noarch : Git GUI tool
git-review.noarch : A git helper for integration with Gerrit
git2cl.noarch : Converts git logs to GNU style ChangeLog format
gitolite.noarch : Highly flexible server for git directory version tracker
gitosis.noarch : Git repository hosting application
gitstats.noarch : Generates statistics based on GIT repository activity
// ……（略）
tkgate-fr.x86_64 : Locales and examples for tkgate, Digital Circuit Simulator
tkgate-it.x86_64 : Locales and examples for tkgate, Digital Circuit Simulator
tkgate-ja.x86_64 : Locales and examples for tkgate, Digital Circuit Simulator
tuxpaint.x86_64 : Drawing program designed for young children
xmlsec1-devel.i686 : Libraries, includes, etc. to develop applications with XML Digital
: Signatures and XML Encryption support.
xmlsec1-devel.x86_64 : Libraries, includes, etc. to develop applications with XML Digital
: Signatures and XML Encryption support.
Name and summary matches only, use "search all" for everything.
3. 安装第三方软件
使用yum install package-name命令安装第三方软件，如使用yum install git安装git
[root@localhost ~]# yum install git Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile epel/metalink | 5.5 kB 00:00 * base: mirrors.aliyun.com * epel: ftp.sjtu.edu.cn * extras: mirrors.aliyun.com * updates: mirror.bit.edu.cn epel | 4.4 kB 00:00 epel/primary_db | 6.0 MB 01:19 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package git.x86_64 0:1.7.1-3.el6_4.1 will be installed --> Processing Dependency: perl-Git = 1.7.1-3.el6_4.1 for package: git-1.7.1-3.el6_4.1.x86_64 --> Processing Dependency: perl(Git) for package: git-1.7.1-3.el6_4.1.x86_64 --> Processing Dependency: perl(Error) for package: git-1.7.1-3.el6_4.1.x86_64 --> Running transaction check ---> Package perl-Error.noarch 1:0.17015-4.el6 will be installed ---> Package perl-Git.noarch 0:1.7.1-3.el6_4.1 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================== Package Arch Version Repository Size ================================================================================== Installing: git x86_64 1.7.1-3.el6_4.1 base 4.6 M Installing for dependencies: perl-Error noarch 1:0.17015-4.el6 base 29 k perl-Git noarch 1.7.1-3.el6_4.1 base 28 k Transaction Summary ================================================================================== Install 3 Package(s) Total download size: 4.7 M Installed size: 15 M Is this ok [y/N]: y Downloading Packages: (1/3): git-1.7.1-3.el6_4.1.x86_64.rpm | 4.6 MB 00:33 (2/3): perl-Error-0.17015-4.el6.noarch.rpm | 29 kB 00:00 (3/3): perl-Git-1.7.1-3.el6_4.1.noarch.rpm | 28 kB 00:00 ---------------------------------------------------------------------------------- Total 140 kB/s | 4.7 MB 00:34 warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 Importing GPG key 0xC105B9DE: Userid : CentOS-6 Key (CentOS 6 Official Signing Key) <[email protected]> Package: centos-release-6-4.el6.centos.10.x86_64 (@anaconda-CentOS-201303020151.x86_64/6.4) From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 Is this ok [y/N]: y （注：这里为输入的内容，导入GPG key） Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : 1:perl-Error-0.17015-4.el6.noarch 1/3 Installing : perl-Git-1.7.1-3.el6_4.1.noarch 2/3 Installing : git-1.7.1-3.el6_4.1.x86_64 3/3 Verifying : git-1.7.1-3.el6_4.1.x86_64 1/3 Verifying : perl-Git-1.7.1-3.el6_4.1.noarch 2/3 Verifying : 1:perl-Error-0.17015-4.el6.noarch 3/3 Installed: git.x86_64 0:1.7.1-3.el6_4.1 Dependency Installed: perl-Error.noarch 1:0.17015-4.el6 perl-Git.noarch 0:1.7.1-3.el6_4.1 Complete!
4. 参考资料
[1]EPEL
https://fedoraproject.org/wiki/EPEL
[2]CentOS 6.2安装第三方软件库epel
http://blog.csdn.net/jackalfly/article/details/7572886