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RepoForge源可以做为Centos官方源及EPEL源的补充，这样Centos下常用软件基本都可使用yum安装了。
Centos5：

rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.i386.rpm
rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el5.rf.x86_64.rpm

Centos6：

rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i686.rpm
rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm

国内使用sohu提供的镜像：

cat > /etc/yum.repos.d/mirrors-rpmforge <<EOF
http://mirrors.sohu.com/dag/redhat/el6/en/$ARCH/rpmforge
EOF
cat > /etc/yum.repos.d/mirrors-rpmforge-extras <<EOF
http://mirrors.sohu.com/dag/redhat/el6/en/$ARCH/extras
EOF
cat > /etc/yum.repos.d/mirrors-rpmforge-testing <<EOF
http://mirrors.sohu.com/dag/redhat/el6/en/$ARCH/testing
EOF

Centos官方源很多软件都没有，编译安装又比较麻烦，可以安装EPEL源解决此问题。
EPEL即Extra Packages for Enterprise Linux，也就是为企业级 Linux提供的扩展软件源，适用于 RHEL，CentOS，Scientific Linux系统。
Centos5安装

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

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：

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

国内访问修改为sohu提供的镜像：

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