docker-compose.yml

# This file is provided with comments on all the tags at their first appearance

# This defines the syntax version of docker-compose.yml
version: "3.9"

# Services defines all different containers.
services:

  # All this tags the container with the name "seaqull-frontend"
  seaqull-frontend:

    # Path to directory with Dockerfile 
    build: ./frontend

    # Restart setting in case of container downtime or crash
    restart: always

    # Expose ports in virtual network and local machine
    ports:
      - "80:80"

    # Defines which networks this container should be part of
    networks:
      - application-bridge

    # This tag states that this container should only be started when the containers defined here have been started.
    # WARNING: It does not prevent this container from running before the containers defined below.
    depends_on:
      - "seaqull-backend"
      - "seaqull-db" 

  seaqull-backend:
    build: ./backend
    restart: always

    # Exposing this ports makes port available to containers within the same network at the time of building (instead of at the time of running)
    expose:
      - "8000"
    ports:
      - "8000:8000"

    # Defines a file with environment variables for this container
    env_file:
      - './backend/.env'
    networks:
      - application-bridge
    depends_on:
      - "seaqull-db"


  seaqull-db:

    # This pulls an image called postgres from hub.docker.com, alternative to the build tag.
    image: postgres
    restart: always
    expose:
      - "5432"
    ports:
      - "5432:5432"
    env_file:
      - "./.env"
    networks:
      - application-bridge

# This defines the networks that are required by the services
networks:

  # The tag here is the name of the network.
  application-bridge: