在linux上加速git clone

1. 进入终端命令行模式，sudo vim /etc/hosts

2. 编辑hosts文件，添加以下ip-域名，保存退出

   151.101.44.249 github.global.ssl.fastly.net 
   192.30.253.113 github.com 
   103.245.222.133 assets-cdn.github.com 
   23.235.47.133 assets-cdn.github.com 
   203.208.39.104 assets-cdn.github.com 
   204.232.175.78 documentcloud.github.com 
   204.232.175.94 gist.github.com 
   107.21.116.220 help.github.com 
   207.97.227.252 nodeload.github.com 
   199.27.76.130 raw.github.com 
   107.22.3.110 status.github.com 
   204.232.175.78 training.github.com 
   207.97.227.243 www.github.com 
   185.31.16.184 github.global.ssl.fastly.net 
   185.31.18.133 avatars0.githubusercontent.com 
   185.31.19.133 avatars1.githubusercontent.com
   192.30.253.120 codeload.github.com

3. 更新DNS缓存 sudo /etc/init.d/networking restart