环境：RedHat5.4 x86_64
cd /etc/yum.repos.d/
wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
mv rhel-debuginfo.repo rhel-debuginfo.repo_ora
mv CentOS-Base.repo rhel-debuginfo.repo
yum clean all
yum makecache
原文：http://www.cnblogs.com/zydev/p/5233923.html