Step-by-Step Guide: Dockerizing a Flask API on Ubuntu for Production

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A technical guide published on DEV Community walks developers through containerizing a Flask REST API on Ubuntu using Docker and Gunicorn. The tutorial begins with installing Docker natively on Ubuntu 22.04 or 24.04, then clones a real-world Flask project from GitHub as a practical starting point. A key focus is writing an optimized Dockerfile that copies requirements.txt before application code, preserving Docker's layer cache and speeding up rebuilds. The guide replaces Flask's built-in development server with Gunicorn to handle concurrent requests safely in production environments. It concludes with steps to version and publish the final Docker image to Docker Hub, covering environment variable configuration for security.

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