yum plugin めも

yum install yum-fastestmirror
yum install yum-priorities
/etc/yum/pluginconf.d/*.conf
enabled=1

rpmforgeを追加
rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt --httpproxy proxy.site --httpport 8080
rpm -ivh http://apt.sw.be/redhat/el5/en/x86_64/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm --httpproxy proxy.site --httpport 8080
base, addons, updates, extrasは priority=1
centosplus,contribは priority=2
rpmforgeなんかの3rd partyは priority=10
参考 # というかそのまま
http://wiki.centos.org/Repositories/RPMForge