$ uname -a
https://access.redhat.com/articles/3078
https://www.centos.org/download/
0_README.txt 06-Nov-2020 14:32 2495
CentOS-7-x86_64-DVD-2009.iso 04-Nov-2020 11:37 4G 标准安装版（推荐）
CentOS-7-x86_64-DVD-2009.torrent 06-Nov-2020 14:44 176K
CentOS-7-x86_64-Everything-2009.iso 02-Nov-2020 15:18 10G 完整版，集成所有软件
CentOS-7-x86_64-Everything-2009.torrent 06-Nov-2020 14:44 381K
CentOS-7-x86_64-Minimal-2009.iso 03-Nov-2020 14:55 973M 精简版
CentOS-7-x86_64-Minimal-2009.torrent 06-Nov-2020 14:44 39K
CentOS-7-x86_64-NetInstall-2009.iso 26-Oct-2020 16:26 575M 网络安装版
CentOS-7-x86_64-NetInstall-2009.torrent 06-Nov-2020 14:44 23K
sha256sum.txt 04-Nov-2020 11:38 398
sha256sum.txt.asc 06-Nov-2020 14:37 1258