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Tunnel

A simple script to automatically establish an ssh tunnel connection to cloud_server.

Description

This script is used to establish a persistant ssh tunnel connection to cloud_server.

The script is run on boot, which issues an ssh command, binding a remote port to a local port. The script runs indefinitely. If the connection is dropped, a notification is pushed through pushover.py script, and repeated attempts are made to reestablish a connection henceforth.

Usage

Files are deployed to

$HOME/bin/tunnel/

directory of tunnel user on local_server with a symbolic link

$HOME/bin/tunnel.py -> $HOME/bin/tunnel/tunnel.py

for easy access.

To keep the connection persistant, instead of dropping and reconnecting due to inactivity, the ssh config file

$HOME/.ssh/config

is set to the following.

Host *
    ServerAliveInterval 60
    ServerAliveCountMax 3

Finally, in order to run at boot time, the following is added to the crontab of the user. Additionally, to have access to other global custom scripts, /usr/local/bin is also set to path.

PATH=/usr/bin:/bin:/usr/local/bin
@reboot $HOME/bin/tunnel.py