docker-compose.yml

version: '2'

services:
  backend:
    # we can use a pre-built image
    # but here we will build the docker image based on the Dockerfile in the current directory
    build: .
    ports:
      - 8000:8000
      - 9229:9229 # debugger port
    volumes:
      # map everything in the current local directory to the working directory in docker image
      - .:/usr/src/app
      - /usr/src/app/node_modules
    command: yarn start:docker
    depends_on:
      # everytime before the "backend" services run, need to ensure that the postgres service has aldy run
      - postgres
    environment:
      # the name after "@" (postgres in this case) should be the same as the name of the database service
      DATABASE_URL: postgres://postgres@postgres/webapp_dev
      PORT: 8000
  
  postgres:
    image: postgres:14-alpine
    ports:
      - 5432:5432
    environment:
      POSTGRES_DB: webapp_dev
      POSTGRES_HOST_AUTH_METHOD: trust