autossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.
To install autossh on Ubuntu, run
sudo apt install autossh -y
To start SSH tunnel using autossh, run
autossh -M 20000 -f -N -p SSH_PORT USER@SERVER_IP -D 7070
Example
autossh -M 20000 -f -N -p 3333 [email protected] -D 7070
Once you run the command you will have a local sock5 proxy on 127.0.0.1 port 7070.
-p 3333 is the SSH port
-M 20000 is port used by autossh to monitor.
Monitoring
-M Specify Monitoring port. autossh with use Monitoring port and Monitoring Port + 1 and send a test data to this port, see if it can revive on other end. If not it restart ssh.
Disable Monitoring
You can disable monitoring by specifying -M 0, this will restart ssh if ssh client exit.
Starting AutoSSH on Boot in Ubuntu
Here is the ssh-tunnel script i use. I start this script on boot with Ubuntu > Unity Dash > Startup Applications
boby@hon-pc-01:~$ cat bin/ssh-tunnel #!/bin/bash /usr/bin/killall autossh #/usr/bin/autossh -M 20000 -f -N -p 3333 [email protected] -D 7070 /usr/bin/autossh -M 0 -o "ExitOnForwardFailure yes" -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3" -f -N -p 3333 [email protected] -D 7070 boby@hon-pc-01:~$
