从简书中转载：
https://www.jianshu.com/p/66facbd8926a
由于某些原因，国内访问github会异常缓慢，在clone仓库时甚至只有10k一下的速度，下载半天也下不完。
本文介绍通过修改系统hosts文件的棒啊，绕过国内dns解析，直接访问github的cdn节点，从而达到加速的目的。
1.进入github官方cdn地址
2.查询下面两个连接的dns解析地址
github.com
github.global.ssl.fastly.net
3.修改系统hosts文件
打开系统hosts文件（管理员权限）
windows路径：C:\Windows\System32\drivers\etc
mac打开方式 sudo vim /etc/hosts
在末尾添加三行记录并保存。注意ip地址与域名间需要有空格
# Copyright (c) 1993-2009 Microsoft Corp. # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host # localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost 192.30.253.112 github.com
199.232.69.194 github.global.ssl.fastly.net
4.刷新系统dns缓存
windows：
Windows + X 打开系统命令行（管理员身份）或者 powershell
运行 ipconfig /flushdns 手动刷新系统dns缓存
mac：
sudo killall -HUP mDNSResponder
5.大功告成
