Create Docker Compose

We will define the docker-compose.yml file in this section. This is used by docker-compose to build and start all the services.

Create Docker Compose file

Create file docker-compose.yml and copy following contents:

version: "1.2"
services:
  nginx:
    container_name: nginx
    build:
      context: .
      dockerfile: Dockerfile.nginx
    ports:
        - 80:80
    depends_on:
        - master
  master:
    build:
      context: .
      dockerfile: Dockerfile
  weather:
    build:
      context: .
      dockerfile: Dockerfile.weather
    ports:
        - 3002:3002
  news:
    build:
      context: .
      dockerfile: Dockerfile.news
    ports:
        - 3003:3003

This tells docker-compose to:

• Create 4 container images :
  • nginx : This uses Dockerfile.nginx and maps internal container port:80 to external port:80
  • master : This uses Dockerfile. Note that we are not providing a mapping of internal port:3001 as we expect to scale this app to many instances
  • weather : This uses Dockerfile.weather and maps internal container port:3002 to external port:3002
  • news : This uses Dockerfile.news and maps internal container port:3003 to external port:3003