從簡書中轉載：

https://www.jianshu.com/p/66facbd8926a

由于某些原因，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

https://www.ipaddress.com/

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:WindowsSystem32driversetc

mac打開方式sudo vim /etc/hosts

在末尾添加三行記錄并保存。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

總結

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