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Docker Reversed SSH Tunnel

Create a lightweight Alpine Linux based SSH tunnel to a host. Uses pure SSH, no fluff.

Schema for how Reversed SSH tunnels work

Image source & learn more about ssh tunneling here

FORKED FROM jujhars13/docker-ssh-tunnel but reversed the tunnel direction.

Perks

  • Stay up to date (with monthly builds that ensure that OpenSSH is up to date)

  • Lightweight

  • Easy to use

  • No need to install anything on the host or the client

Required Parameters

Variable Description default
SSH_PORT Port number for SSH 22
SSH_USER Username for the SSH connection root
LOCAL_IP IP address of the target you want to expose 127.0.0.1
LOCAL_PORT The port you want to expose on the target 80
GATEWAY_IP IP/Domain of the machine that will expose your app (the host) (required)
REMOTE_PORT Which port should sshd listen from on the gateway 80
REMOTE_IP Which IP should sshd listen from on the gateway (* for all) *

Note: Remember to inject/mount your private SSH key into the container to /ssh_key.

Repos

  • gcr.io: docker pull gcr.io/kalitsune/docker-reversed-ssh-tunnel
  • Docker Hub: docker pull kalithekitsune/docker-reversed-ssh-tunnel

Example

please refer to the examples/docker-compose.yml file for an example.

Recommandations

if you want to use an open-ssh docker container as the gatewway, you can use this linux-server.io image mod