mac 修改 hosts 文件之后，刷新 DNS 缓存

记不住 dscacheutil ？ dsca 按 TAB 自动补全

$ dscacheutil -h

	Usage: dscacheutil -h
	       dscacheutil -q category [-a key value]
	       dscacheutil -cachedump [-buckets] [-entries [category]]
	       dscacheutil -configuration
	       dscacheutil -flushcache
	       dscacheutil -statistics

http://ping.chinaz.com/
或者 https://websites.ipaddress.com/

1. ping github.com 之后，找到其中最快的 ip
   同样 github.global.ssl.fastly.net 和 assets-cdn.github.com

2. vim /etc/hosts

    # GitHub Start 
    # 140.82.112.3 github.com
    # 140.82.113.3 github.com
    # 140.82.114.4 github.com
    # 13.114.40.48 github.com
    15.164.81.167 github.com
    
    199.232.69.194 github.global.ssl.fastly.net
    # 151.101.44.249 github.global.ssl.fastly.net
    # 185.31.16.184 github.global.ssl.fastly.net
    
    185.199.108.153 assets-cdn.github.com
    185.199.109.153 assets-cdn.github.com
    185.199.110.153 assets-cdn.github.com
    185.199.111.153 assets-cdn.github.com
    
    # 23.235.47.133 assets-cdn.github.com
    # 203.208.39.104 assets-cdn.github.com
    # 103.245.222.133 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
    # 185.31.18.133 avatars0.githubusercontent.com 
    # 185.31.19.133 avatars1.githubusercontent.com 
    219.76.4.4 github-cloud.s3.amazonaws.com
    
    185.199.108.154 github-releases.githubusercontent.com
    # GitHub End
   

3. mac 刷新 dns

    dscacheutil -flushcache
   

   记不住？ dsca 按 TAB 自动补全

   $ dscacheutil -h

    Usage: dscacheutil -h
           dscacheutil -q category [-a key value]
           dscacheutil -cachedump [-buckets] [-entries [category]]
           dscacheutil -configuration
           dscacheutil -flushcache
           dscacheutil -statistics
   

   windows

    ipconfig /flushdns