3358 archive.kernel.org/centos-vault/6.9/isos/x86 _ 64/centos-6.9-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.8/isos/x86 _ 64/centos-6.8-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.7/isos/x86 _ 64/centos-6.7-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.6/isos/x86 _ 64/centos-6.6-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.5/isos/x86 _ 64/centos-6.5-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.4/isos/x86 _ 64/centos-6.4-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.3/isos/x86 _ 64/centos-6.3-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.2/isos/x86 _ 64/centos-6.2-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.1/isos/x86 _ 64/centos-6.1-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/6.0/isos/x86 _ 64/centos-6.0-x86 _ 64-bin-DVD1. iso
3358 archive.kernel.org/centos-vault/5.9/isos/x86 _ 64/centos-5.9-x86 _ 64-bin-DVD-1of2. iso
3358 archive.kernel.org/centos-vault/5.8/isos/x86 _ 64/centos-5.8-x86 _ 64-bin-DVD-1of2. iso
http://mirrors.cqu.edu.cn/centos /
Ubuntu版官网下载： http://mirrors.Melbourne.co.uk/Ubuntu-releases /
http://releases.ubuntu.com/
OpenSUSE版本官方网站下载： https://download.opensuse.org/distribution/leap /
下载选择示例：
1、进入官网下载地址
2、选择要下载的版本
3、
4，
5、
各版本差异，参考文章：
3359 blog.csdn.net/ZL _ step by step/article/details/77982553