阿里云Linux安装镜像源地址：http://mirrors.aliyun.com
配置方法：
1.备份
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 6 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo CentOS 7 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo CentOS 8 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
3.更新缓存
yum clean all && yum makecache
yum update -y
原文：https://www.cnblogs.com/Summer6/p/12821095.html