卸载HREL5自带的yum包
rpm -qa |grep
将找到的包全部rpm -e
卸载redhat-release
从下载并安装对应版本的
yum-...
yum-fastestmirror-...
yum-metadata-parser-...
yum-updatesd-...
cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo.save
wget
mv CentOS-Base.repo.5 CentOS-Base.repo
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