为了方便做的笔记。
Centos5的

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
cd /etc/yum.repos.d/
wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
yum clean all
yum makecache

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