docker-compose.yml

version: "3.1"
services:
        db:
                image: mongo
                restart: always
                networks:
                        - db_network # for API reqs
                environment:
                        MONGO_INITDB_ROOT_USERNAME: $DB_USERNAME
                        MONGO_INITDB_ROOT_PASSWORD: $DB_PASSWORD
                        MONGO_INITDB_DATABASE: $MONGO_INITDB_DATABASE
                volumes:
                        - db_vol:/data/db

        db-interface:
                image: mongo-express
                restart: always
                environment:
                        ME_CONFIG_MONGODB_ADMINUSERNAME: $DB_USERNAME
                        ME_CONFIG_MONGODB_ADMINPASSWORD: $DB_PASSWORD
                        ME_CONFIG_SITE_BASEURL: /db_interface/
                        ME_CONFIG_MONGODB_SERVER: db
                networks:
                        - db_network # access db
                        - web_network # access the interface
                depends_on:
                        - db

        backend:
                build: ./backend
                command: --log-level debug
                restart: always
                volumes:
                        - ./backend:/app
                environment:
                        PORT: 8080
                        DEBUG: $DEBUG
                        SECRET_KEY: $SECRET_KEY
                        DATABASE_URL: $DATABASE_URL
                depends_on:
                        - db
                networks:
                        - db_network # for data fetching/upload
                        - web_network # for web API

        frontend:
                build:
                        context: ./frontend
                        args:
                            DEBUG: $DEBUG   
                entrypoint: ./entrypoint.sh
                restart: unless-stopped
                environment:
                    NODE_ENV: development  # OR [production]
                volumes:
                        - web-root:/home/node/app/dist
                        - ./frontend:/home/node/app
                        - /home/node/app/node_modules
                environment:
                        PORT: 5000
                        DEBUG: $DEBUG
                depends_on:
                        - backend
                networks:
                        - web_network

        nginx:
                image: nginx:latest
                ports:
                        - 8000:80
                volumes:
                        - web-root:/var/www/html
                        - ./config/nginx:/etc/nginx/conf.d/
                depends_on:
                        - frontend
                        - backend
                        - db-interface
                networks:
                        - web_network

networks:
        web_network:
            driver: bridge
        db_network:
            driver: bridge

volumes:
        web-root:
        db_vol: