devster31/ssh-tunnel.md

Created August 16, 2017 12:00

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Bash script to setup a temporary SSH tunnel

Raw

You can do this cleanly with an ssh 'control socket'. To talk to an already-running SSH process and get it's pid, kill it etc. Use the 'control socket' (-M for master and -S for socket) as follows:

$ ssh -M -S my-ctrl-socket -fnNT -L 50000:localhost:3306 [email protected]
$ ssh -S my-ctrl-socket -O check [email protected]
Master running (pid=3517) 
$ ssh -S my-ctrl-socket -O exit [email protected]
Exit request sent.

Note that my-ctrl-socket will be an actual file that is created. I got this info from a very RTFM reply on the OpenSSH mailing list.