Docker ssh tunnel11/11/2023 This way you do not have to install SSH clients, keys etc. sudo iptables -I INPUT 3 -i docker0 -j ACCEPTĪfter this step you open a SSH tunnel on the host and also use it inside your container. Note that the change below is not persisted, you need to do it again after reboot or add it permanently. You then need to enable packet forwarding to this bridge for IP tables. You can find out the bridge a container uses with docker inspect «container». TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 This technique gives a much more fine granular control over which containers may access the tunnel. This bridge is available to all the containers connected to the particular network and thus can also forward specific ports. This fix makes use of the -net=host flag, which allows accessing all ports of the host - also open SSH tunnels.īut for obvious reasons, this is dangerous.Ī better approach is to bind the SSH tunnel to the bridge network of the Docker service. In many cases this is not possible without building a new Docker image which includes the client.Īs this is a cumbersome approach, an easy but insecure solution exists, which is recommended in many tutorials or posts on StackOverflow. Using SSH tunnels within Docker containers would require installing an SSH client and mounting keys. Since more and more services are containerized, it makes sense to use SSH tunnels also within the context of containers, especially for testing. There are many use cases for SSH tunnels as they allow accessing resources behind firewalls and other obstacles over a secure channel.
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