從簡書中轉載：
https://www.jianshu.com/p/66facbd8926a
由於某些原因，國內訪問github會異常緩慢，在clone倉庫時甚至只有10k一下的速度，下載半天也下不完。
本文介紹通過修改系統hosts文件的棒啊，繞過國內dns解析，直接訪問github的cdn節點，從而達到加速的目的。
1.進入github官方cdn地址
2.查詢下面兩個連接的dns解析地址
github.com
github.global.ssl.fastly.net
3.修改系統hosts文件
打開系統hosts文件（管理員權限）
windows路徑：C:\Windows\System32\drivers\etc
mac打開方式 sudo vim /etc/hosts
在末尾添加三行記錄並保存。注意ip地址與域名間需要有空格
# 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.刷新系統dns緩存
windows：
Windows + X 打開系統命令行（管理員身份）或者 powershell
運行 ipconfig /flushdns 手動刷新系統dns緩存
mac：
sudo killall -HUP mDNSResponder
5.大功告成