官方很多软件都没有，编译安装又比较麻烦，可以安装解决此问题。

即Extra Packages for Enterprise Linux，也就是为企业级 提供的扩展软件源，适用于 RHEL，CentOS，Scientific Linux系统。
Centos5安装

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#http://www.haiyun.me
rpm -ivh http:
//dl
.fedoraproject.org
/pub/epel/5/i386/epel-release-5-4
.noarch.rpm
rpm -ivh http:
//dl
.fedoraproject.org
/pub/epel/5/x86_64/epel-release-5-4
.noarch.rpm

centos6安装

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rpm -ivh http:
//dl
.fedoraproject.org
/pub/epel/6/i386/epel-release-6-8
.noarch.rpm
rpm -ivh http:
//dl
.fedoraproject.org
/pub/epel/6/x86_64/epel-release-6-8
.noarch.rpm

   

Centos7安装：

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

导入KEY：

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

国内访问修改为sohu提供的镜像：

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cat
>
/etc/yum
.repos.d
/epel
.repo <<EOF
[epel]
name=Extra Packages
for
Enterprise Linux 6 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
baseurl=http:
//mirrors
.sohu.com
/fedora-epel/6/
$basearch
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=
file
:
///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
 
[epel-debuginfo]
name=Extra Packages
for
Enterprise Linux 6 - $basearch - Debug
#baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch/debug
baseurl=http:
//mirrors
.sohu.com
/fedora-epel/6/
$basearch
/debug
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=
file
:
///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=1
 
[epel-
source
]
name=Extra Packages
for
Enterprise Linux 6 - $basearch - Source
#baseurl=http://download.fedoraproject.org/pub/epel/6/SRPMS
baseurl=http:
//mirrors
.sohu.com
/fedora-epel/6/SRPMS
#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=
file
:
///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
gpgcheck=1
EOF