1.更新yum源国内阿里1.1备份当前yum仓库配置sudocp/etc/yum.repos.d/CentOS-Base.repo/etc/yum.repos.d/CentOS-Base.repo.backup1.2下载阿里云的centos7源配置文件sudowget-O/etc/yum.repos.d/CentOS-Base.repohttp://mirrors.aliyun.com/repo/Centos-7.repo或sudocurl-