docker-ssh-bastion/docker-compose.yml

version: '2'

volumes:
  host_keys:

services:
  ssh_bastion:
    build: .
    image: fphammerle/ssh-bastion
    environment:
      USERS: alice,bob
    volumes:
    - host_keys:/etc/ssh/host_keys:rw
    ports:
    - '0.0.0.0:2222:22'
    restart: unless-stopped

# https://docs.docker.com/compose/compose-file/compose-file-v2/