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：

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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

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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

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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