1.首先要自己搭建一个代理
https://blog.csdn.net/Jessica_hhh/article/details/133276101
https://blog.csdn.net/Jessica_hhh/article/details/133276101
2. 确认机器装过nc，若没有，用`yum install -y nc`安装
centos 6使用yum安装软件_duang_huang的博客-CSDN博客
3. 修改ssh设置，在目录vim ~/.ssh/config
```
Host github.com
Hostname ssh.github.com
User git
Port 443
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_rsa
ProxyCommand nc -X connect -x 123.123.1.2:7890 %h %p
ServerAliveInterval 20
```
