Node + PostgreSQL

docker-compose.yml

version: '3'
postgres:
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: password
      POSTGRES_USER: goku
services:
  api:
    build: "."
    container_name: "api"
    working_dir: /home/node/app
    links:
      - postgres
    environment:
      - NODE_ENV=development
    volumes:
      - ./:/home/node/app
    ports:
      - 8081:8081
    expose:
      - "8081"
    command: "yarn run dev"
    tty: true

Dockerfile

FROM node:8.9-alpine

RUN npm install --global yarn && \
  yarn global add pm2 && \
  yarn