下载的CentOSyum源不是国内镜像，会导致yum在线安装和更新速度很慢。这时候需要将yum源设置为国内镜像站点，以提高速度。阿里云官方镜像站阿里云CentOS镜像介绍CentOS是一个基于RedHatLinux的可自由使用源码的企业级Linux发行版；它是一个稳定的、可预测的、可管理的、可复制的免费企业级计算平台。配置方法1、备份mv/etc/yum.repos.d/CentOS-Base.repo/etc/yum.repos.d/CentOS-Base.repo.backup2。下载新的CentOS-Base.repo到/etc/yum.repos.d/CentOS8wget-O/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun.com/repo/Centos-8.repo或curl-o/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun.com/repo/Centos-8.repoCentOS7wget-O/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun。com/repo/Centos-7.repo或curl-o/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun.com/repo/Centos-7.repoCentOS6wget-O/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun.com/repo/Centos-6.repo或curl-o/etc/yum.repos.d/CentOS-Base.repohttps://mirrors.aliyun.com/repo/Centos-6.repo3.运行yummakecache生成缓存4.其他非阿里云ECS用户会提示Couldn'tresolvehost'mirrors.cloud.aliyuncs.com'，这不会影响使用。用户也可以自行修改相关配置：eg:sed-i-e'/mirrors.cloud.aliyuncs.com/d'-e'/mirrors.aliyuncs.com/d'/etc/yum.repos.d/CentOS-基地.repo
