ssh-keygen -t rsa -b 4096 -C "your_email@example.com" 而後一路回車就能夠了
Host github.com HostName github.com User git IdentityFile ~/.ssh/id_rsa Host code.aliyun.com HostName code.aliyun.com RSAAuthentication yes User git IdentityFile ~/.ssh/id_ali_rsa
https://help.github.com/articles/connecting-to-github-with-ssh/git