docker-compose.yml

version: '2.2'

networks:
  default:
    driver_opts:
      com.docker.network.bridge.name: systemctl-mqtt

#volumes:
#  config:

services:
  broker:
    image: docker.io/eclipse-mosquitto:latest
    user: mosquitto
    read_only: yes
    #ports: ['127.0.0.1:1883:1883/tcp']
    cap_drop: [all]
    security_opt: [no-new-privileges]
    cpus: 0.4
    mem_limit: 32M
  client:
    build: .
    image: fphammerle/systemctl-mqtt
    volumes:
    #- config:/etc/systemctl-mqtt:ro
    - /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket:rw
    command: systemctl-mqtt
      --poweroff-delay-seconds 60
      --mqtt-host broker
      --mqtt-disable-tls
    #  --mqtt-username raspberrypi
    #  --mqtt-password-file /etc/systemctl-mqtt/mqtt-password
    hostname: raspberrypi
    userns_mode: host
    # prefering explicit user specification over "USER 0" in Dockerfile
    # to avoid accidental container startup without
    # secure apparmor profile and dropped capabilities
    user: '0'
    read_only: true
    cap_drop: [all]
    security_opt:
    - no-new-privileges
    # $ sudo apparmor_parser --replace ./docker-apparmor-profile
    # raspberrypi kernel apparmor: https://github.com/raspberrypi/linux/pull/1698#issuecomment-684989048
    # https://github.com/raspberrypi/linux/commit/a3e07c5dfef2664fc1d900ebb4a3f91c04ab700b
    - apparmor=systemctl-mqtt
    # docker-compose >=2.2,<3
    cpus: 0.4
    mem_limit: 32M

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