psql to see

version: '2'

services:
  nginx:
    build: ./docker/nginx/
    ports:
      - 80:80
    links:
      - php7
    volumes_from:
      - app
    depends_on:
      - db

  php7:
    build: ./docker/php/
    expose:
      - 9000
    links:
      - db:localhost
    volumes_from:
      - app
    depends_on:
      - db

  app:
    image: php:7.2-fpm
    volumes:
...

  db:
    image: postgres:9.6
    environment:
      POSTGRES_PASSWORD: nothing
      POSTGRES_USER: nothing
      POSTGRES_DB: nothing
    volumes:
      - './.1/pg:/var/lib/postgresql/data'
    ports:
      - 5432:5432