version: '3'

services:
  a:
    image: postgres
    environment:
      POSTGRES_USER: vapor_username
      POSTGRES_DB: vapor_database
      POSTGRES_PASSWORD: vapor_password
    ports:
      - 5432:5432
  b:
    image: postgres
    environment:
      POSTGRES_USER: vapor_username
      POSTGRES_DB: vapor_database
      POSTGRES_PASSWORD: vapor_password
    ports:
      - 5433:5432