阿里雲官方鏡像站:https://developer.aliyun.com/mirror/
ubuntu18.04:http://mirrors.aliyun.com/ubuntu-releases/18.04/
centos/.7.1908:http://mirrors.aliyun.com/centos/7.7.1908/isos/x86_64/
阿里雲官方鏡像站:https://developer.aliyun.com/mirror/
ubuntu18.04:http://mirrors.aliyun.com/ubuntu-releases/18.04/
centos/.7.1908:http://mirrors.aliyun.com/centos/7.7.1908/isos/x86_64/
https://blog.csdn.net/u013129300/article/details/129329786