Using SSH tunnel to reach a database server via JumpHost

Posted March 29, 2020 by  ‐ 1 min read

Let’s say you have a database server behind a firewall. Let it be a MySQL server at the host mysql-server at port number 3306.

And the port number 3306 is not open to your local machine. But you have a JumpHost that have SSH to that mysql-server but it doesn’t have direct access to port 3306

The solution is pretty simple. You tunnel from your local machine to the jump host, from there you create another SSH tunnel to the mysql-server and then access the database

localhost (3306 via 22) --> jumphost (3306 via 22) --> mysql-server (3306 via 22)

This is how you can do it

ssh -A -t [email protected] -L 3306: ssh [email protected] -L 3306: -N

The assumptions made:

  • You have ssh access to jumphost over 22
  • You have ssh access to mysql-server from jumphost
  • You have your ssh key in the agent (ssh-add ~/.your-key-location)