# 备份系统默认yum源配置文件后缀.bak做备份标记 mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak # curl下载阿里云CentOS7官方镜像源覆盖原有repo文件 curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo # 清空旧yum缓存 重新生成软件源缓存 yum clean all yum makecache