Docker for Flask: Why You Should Containerize Your App

Docker is a containerization platform that packages your application with all its dependencies into a single, portable container.

Benefits of using Docker with Flask:

• Consistent environment: The same environment on your laptop, staging, and production.
• Easy deployment: Deploy to any cloud provider (AWS, DigitalOcean, Heroku) without configuration headaches.
• Isolation: Each service (Flask app, PostgreSQL, Redis) runs in its own container.
• Scalability: Easily scale using Docker Compose or Kubernetes.

Example Dockerfile for Flask:

FROM python:3.11-slim
WORKDIR /app
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:8000", "app:app"]
        

Build the image: docker build -t my-flask-app .

Run the container: docker run -p 8000:8000 my-flask-app