Simple Node Docker w/ Compose

compose.yml

services:

  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      NODE_ENV: development
      DATABASE_URL: postgres://postgres:postgres@postgres/app
    depends_on:
      postgres:
        condition: service_healthy

  postgres:
    image: postgres:alpine
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: app
      POSTGRES_HOST_AUTH_METHOD: trust
    ports:
      - "5432:5432"
    volumes:
      - pg_data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 30s
      timeout: 10s
      retries: 5

volumes:
  pg_data:

Dockerfile

FROM node:latest

WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install

COPY . .

EXPOSE 3000

CMD ["npm", "start"]