阿里云镜像源地址：http://mirrors.aliyun.com/ ①备份原镜像源文件到原文件夹，便于恢复 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup ②下载新的CentOS-Base.repo 到/etc/yum.repos.d/ CentOS 5 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Cen…