docker-compose.postgres.yml

version: '3.1'

services:

  db:
    build: 
      context: .
      dockerfile: Dockerfile       
    restart: always
    volumes:
      - volume_intranet:/var/lib/postgresql/data/
    ports:
      # the 5432 host port is occupied by a local postgressql server
      - 5433:5432           

volumes:
  volume_intranet: