CentOS7替换yum源_1

备份原文件mv/etc/yum.repos.d/CentOS-Base.repo/etc/yum.repos.d/CentOS-Base.repo.backup下载阿里源文件替换curl-o/etc/yum.repos.d/CentOS-Base.repohttp://mirrors.aliyun.com/repo/Centos-7.repo构建缓存yummakecache