Aleksei Vesnin aleskiontherun

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

Inspired By: grafana/loki#333

docker-compose.yml

version: "3"

networks:
  loki:

	#!/bin/bash
	#
	# The MIT License (MIT)
	#
	# Copyright (c) 2014 Mathias Leppich <[email protected]>
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

	# Creates a "dummy" network interface
	# we'll configure this interface with a link-local address
	# See: https://www.freedesktop.org/software/systemd/man/systemd.netdev.html
	##

	[NetDev]
	Name=dummy0
	Kind=dummy