# Attention!
# This was written for example purposes and this
# exact setup might not work in a real case scenario

version: '3'

services:
  nginx:
    image: nginx:latest
    environment:
      - NGINX_PORT=80
      - RUBY_HOST=ruby_app # Service name as host
      - PYTHON_HOST=python_app # Service name as host
    ports:
      - 80:80
    links:
      - ruby_app
      - python_app

  python_app:
    build: . # Picture a Dockerfile setting up stuff
    command: python run.py
    environment:
      - DB_USER=postgres_user
      - DB_PASSWORD=postgres_password
      - DB_NAME=postgres_db
      - DB_HOST=postgres_service # Service name as host
    links:
      - postgres_service

  ruby_app:
    build: . # Picture a Dockerfile setting up stuff
    command: ruby run.rb
    environment:
      - DB_USER=postgres_user
      - DB_PASSWORD=postgres_password
      - DB_NAME=postgres_db
      - DB_HOST=postgres_service # Service name as host
    links:
      - postgres_service

  postgres_service:
    image: postgres:latest
    environment:
      - POSTGRES_DB=postgres_db
      - POSTGRES_USER=postgres_user
      - POSTGRES_PASSWORD=postgres_password