http://www.aixchina.net/home/space.php?uid=73104&do=blog&id=30463

http://shenfeng.me/ssh-usage.html

Forward the local port 8080 to the remote server 8080,so you can visit the local server via the remote server.

ssh -R :8080:localhost:8080 -Nf root@vps.pjq.me -p 2222

http://riny.net/2014/git-ssh-key/

Sometimes we will have many different ssh keys, so need config it to support different keys.

touch ~/.ssh/config

Apps-iMac:.ssh pengjianqing$ cat config

Host ef.pjq.me
    IdentityFile ~/.ssh/digitalocean_rsa
    User root