How can I use Docker Compose for my Flask application?

How can I use Docker Compose for my Flask application?

You can use Docker Compose to define and run multi-container Docker applications. For a Flask app, you'll typically create a docker-compose.yml file that specifies the Flask service and any other services it depends on, like a database.

What should I include in the docker-compose.yml file?

Your docker-compose.yml file should include the version, services, and any environment variables. For example:

version: '3'
services:
  web:
    build: .
    ports:
      - "5000:5000"
    environment:
      - FLASK_ENV=development
  db:
    image: postgres
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password

How do I build and run the containers?

You can build and run your containers by navigating to the directory with your docker-compose.yml file and running:

docker-compose up --build
``` This command builds the images and starts the containers.

Can I scale my Flask app using Docker Compose?

Yes, you can scale your Flask app by using the --scale option. For example, to run 3 instances of your web service, you would use:

docker-compose up --scale web=3