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autossh init.d script

Script to generate ssh tunnel at debian/raspian boot

Usage

Be sure you have autossh installed

$apt-get install autossh

Autossh doesn't allow to set a password so you have to upload your rsa key to remote server. As we don't configure an specific user for autossh generate keys as root

$ssh-keygen -t rsa

...and let default options without passphrase, then copy public key to remote server...

$ssh-copy-id user@remotehost

...or alternatively using just ssh...

$cat ~/.ssh/id_rsa.pub | ssh user@remotehost "mkdir -p ~/.ssh && cat >>  ~/.ssh/authorized_keys"

Now test that you can access remote server WITHOUT password

$ssh user@remotehost

If it's ok you can now configure autossh script First edit autossh-tunnel to adjust your need. If you want to create multiple tunnels you have to create different autossh-tunnel files, just copy and rename them. Key parameters are:

  • MPORT=54321 # autossh monitoring port (unique, change only if you create multiple tunnels)
  • TUNNEL="-L 1234:localhost:1234" # the ssh tunnel to setup
  • RUSER="user" # remote user
  • RSERVER="remotehost.tld -p 22" # remote server (change standard port 22 if you are using another one)

Let's install this script to run it at boot

$cp autossh-tunnel /etc/init.d/
$chmod +x /etc/init.d/autossh-tunnel
$update-rc.d autossh-tunnel defaults

And test it!

$/etc/init.d/autossh-tunnel start #to run
$/etc/init.d/autossh-tunnel stop #to stop
$/etc/init.d/autossh-tunnel restart #to (guess it!)