(1)备份,将 CentOS-Base.repo 为CentOS-Base.repo.backup
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
(2)下载新的阿里云镜像 http://mirrors.aliyun.com/repo/Centos-7.repo,并命名为CentOS-Base.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
(3)清除缓存
yum clean all # 清除系统所有的yum缓存
yum makecache # 生成yum缓存
yum update
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原文链接:https://blog.csdn.net/xiaojin21cen/article/details/84726193
原文:https://www.cnblogs.com/h0xx/p/12057528.html