首先备份/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)
cd /etc/yum.repos.d/
CentOS7:
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
CentOS6:
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
CentOS5:
wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
运行以下命令生成缓存
yum clean all
yum makecache
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