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Dockerfile for building an image that runs an OpenSSH server that's configured to act as a ProxJump host only.

The server listens on port 2222. The only user that is able ta connect is bastion. It is not possible to get a terminal on the host. It is only suitable to ProxyJump to other hosts.

At the first startup the host SSH keys will be created in /config as well as an authorized_keys file.

Just build the image, define a volume oder bind mount for /config and add your public key to the authorized_keys file.

Expose port 2222 and you can connect as user bastion with your defined private key.

Sample config for docker-compose

version: "3"

    container_name: ssh-jumphost
      context: https://github.com/chrisb86/docker-ssh-jumphost.git
      - ./config:/config
      - 2222:2222
      - /tmp
      - /run
      - /var/tmp
    read_only: true

In this example the whole container is readonly and directories that have to be writable are mounted with tmpfs.

Just create the docker-compose.yml run docker-compose up -d --buildand you're done.