Centos 8.2 2004镜像地址 中科大源: https://mirrors.ustc.edu.cn/centos/8.2.2004/isos/x86_64/ 注:如何更改为科大源: https://mirrors.ustc.edu.cn/help/centos.html 阿里云: http://mirrors.aliyun.com/centos/8.2.2004/isos/x86_64/