CentOS
备份
mv CentOS-Base.repo CentOS-Base.repo.backup
下载阿里云的 CentOS-Base.repo 比如 centos7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
生成缓存
yum makecache
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