services:

  pcap-broker-remote-host:
    image: pcap-broker:latest
    container_name: pcap-broker-remote-host
    restart: always
    volumes:
      # Mount the private key into container that wil be used for SSH
      # Ensure that on the `remote-host` the public key is in the /root/.ssh/authorized_keys file.
      - ~/.ssh/id_ed25519:/root/.ssh/id_ed25519:ro 
    environment:
      # Command that will be executed by pcap-broker to read PCAP data.
      # Which is to SSH into `remote-host` and run tcpdump on eth0 and write PCAP data to stdout.
      # The `not port 22` BPF is necessary to avoid any traffic loops as the PCAP data is transferred over SSH.
      PCAP_COMMAND: |-
        ssh root@remote-host -oStrictHostKeyChecking=no
        tcpdump -U --immediate-mode -ni eth0 -s 65535 -w - not port 22

      # Bind on 0.0.0.0 port 4242. From within the same Docker network you can reach it using the `container_name`
      # For example in another Docker service you can reach this pcap-broker using `pcap-broker-remote-host:4242`
      LISTEN_ADDRESS: "0.0.0.0:4242"
    ports:
      # This is optional, but makes the PCAP-over-IP port also available locally on the Docker host on port 4200. 
      # Handy for debugging, for example: `nc -v localhost 4200 | tcpdump -nr -`
      - 127.0.0.1:4200:4242