iso镜像下载地址 https://ftp.sjtu.edu.cn/centos/8.3.2011/isos/x86_64/ https://mirrors.aliyun.com/centos/8.3.2011/isos/x86_64/ https://mirrors.ustc.edu.cn/centos/8.3.2011/isos/x86_64/ https://mirrors.njupt.edu.cn/centos/8.3.2011/isos/x86_64/ https://mirrors.163.com/ce…