version: "3"
services:
postgres:
  image: postgres
  environment:
    - POSTGRES_USER=postgres
    - POSTGRES_PASSWORD=postgres
    - POSTGRES_DB=my_db
  ports:
    - "5433:5432"
  volumes:
    - ~/tmp/lib:/var/lib/postgresql/10/main
    - ~/tmp/log:/var/log/postgresql
    - ~/tmp/etc:/etc/postgresql
web:
  image: my/build
  ports:
    - "4000:4000"
  volumes:
    - .:/app