docker-compose.yaml

# Declares volumes that can be used by services in the Docker Compose file
volumes: 
  # Declares a volume named grafana_data
  grafana_data: {}

# Defines networks that can be used by services in the Docker Compose file
networks:
  # Declares a network named front-tier
  front-tier:
  # Declares a network named back-tier
  back-tier:

# Defines the services that make up your app
services:
  # Defines a service named db
  db:
    # Specifies the Docker image to use for this service
    image: postgres
    # Ensures that the service is always restarted if it stops
    restart: always
    # Sets environment variables for the service
    environment:
      # Sets the password for the Postgres database
      POSTGRES_PASSWORD: example
    # Maps ports between the host and the container
    ports:
      - "5432:5432"
    # Specifies the networks that this service is part of
    networks:
      - back-tier

  # Defines a service named adminer
  adminer:
    image: adminer
    restart: always
    ports:
      - "8080:8080" # host:container
    networks:
      - back-tier
      - front-tier  

  # Defines a service named grafana
  grafana:
    image: grafana/grafana-enterprise
    # Sets the user ID under which the service will run
    user: "472"
    ports:
      - "3000:3000"
    # Maps local directories or files to directories inside the container
    volumes:
      # Maps a local file to a file inside the container, and makes it read-only
      - ./grafana/grafana_datasources.yaml:/etc/grafana/provisioning/datasources/datasource.yaml:ro
      - ./grafana/grafana_dashboards.yaml:/etc/grafana/provisioning/dashboards/dashboards.yaml:ro
      - ./grafana/dashboards:/opt/grafana/dashboards
    networks:
      - back-tier
      - front-tier
    restart: always