修改linux中hosts文件，加速github访问下载：
1、修改hosts文件：/etc/hosts
[root@superroot mydock03]# vim /etc/hosts
127.0.0.1 ? localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 ? ? ? ? localhost localhost.localdomain localhost6 localhost6.localdomain6
# github
140.82.113.3?? ?http://github.com
185.199.108.153?? ?http://assets-cdn.github.com
199.232.69.194?? ?http://github.global.ssl.fastly.net
2、刷新DNS缓存
[root@superroot mydock03]# /etc/init.d/network restart
Restarting network (via systemctl): [ OK ]
