国内github访问加速

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以下的速度，下载半天有时还会失败需要从头再来，甚是让人恼火。

本文介绍通过修改系统hosts文件的办法，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。不需要科学上网，也不需要海外的服务器辅助。

获取GitHub官方CDN地址
打开https://www.ipaddress.com/
查询以下三个链接的DNS解析地址
github.com
assets-cdn.github.com
github.global.ssl.fastly.net
记录下查询到的IP地址。

修改系统Hosts文件
打开系统hosts文件(需管理员权限)。
路径：C:WindowsSystem32driversetc
在末尾添加三行记录并保存。(需管理员权限，注意IP地址与域名间需留有空格)

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
151.101.72.133 assets-cdn.github.com
151.101.193.194 github.global.ssl.fastly.net
刷新系统DNS缓存
Windows+X 打开系统命令行（管理员身份）或powershell
运行 ipconfig /flushdns 手动刷新系统DNS缓存。
现在打开Github，clone一个项目到本地试试吧，作者这电信的宽带会轻松达到10M/s的速度。