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Database and Core App Connection through Docker

Database and Core App Connection through Docker

Learn how to connect the Flask application to MySQL database through Docker.

We'll cover the following...

Adding the database to the docker-compose.yml file

To connect our Core app to the database, we must add the MySQL database as a service in the docker-compose.yml file, as shown below: 

version: '2.2'
services:
  backend:
    image: educative1/python_django_flask:latest
    command: 'python3 core.py'
    ports:
      - 5000:5000
    volumes:
      - .:/backendservice
    depends_on:
       db:
          condition: service_healthy
  db:
    image: mysql:latest
    restart: always
    environment:
      MYSQL_DATABASE: core
      MYSQL_USER: microservice 
      MYSQL_PASSWORD: microservice 
      MYSQL_ROOT_PASSWORD: microservice 
    volumes:
      - dbdata:/var/lib/mysql
    ports:
      - 3306:3306
    healthcheck:
      test: mysqladmin ping -h 127.0.0.1 -u $$MYSQL_USER --password=$$MYSQL_PASSWORD
      
volumes:
  dbdata:

  • Lines 10–11: We use the depends_on keyword to set the startup or shutdown order of services. Here, we set it to db. This means the database service will be the first to start running, before any other service.

  • Line 12: We use the condition keyword to state the condition under which dependency is satisfied. Here, it is service_healthy, which specifies that a dependency is expected to be healthy.

  • Line 14: We use the db keyword to indicate adding a database service.

  • Line 15: We use the image keyword to ...