Mastering Flask Web Development - Second Edition

Docker Compose

Docker Compose is a tool for defining our multi-layer application. This is where we define all the services needed to run our application, configure them, and link them together.

Docker Compose is based on YAML files, which is where all the definition happens, so let's dive right into it and take a look at the deploy/docker/docker-compose.yaml file:

version: '3'services:  db:    image: mysql:5.7    env_file:      - prod.env  rmq:    image: rabbitmq:3-management    env_file:      - prod.env    ports:      - 15672:15672  redis:      image: redis  worker:    image: myblog_worker:latest    depends_on:      - db      - rmq    env_file:      - prod.env  frontend:    image: myblog    depends_on:      - db      - rmq    env_file:      - prod.env    restart: always    ports:      - 80:80

In Docker Compose, we have defined the following ...