Lightweight Deployment of Flask: Rapid Online through Docker Containerization

This article introduces the method of containerizing and deploying Flask applications using Docker to address deployment issues caused by differences between development and production environments. The core advantages of Docker include environment consistency, strong isolation, light weight, and rapid deployment. The quick start process consists of four steps: first, prepare the Flask application (including app.py and requirements.txt); second, write a Dockerfile using the Python 3.9-slim base image, set the working directory, install dependencies, copy files, and configure the startup command; third, execute `docker build -t myflaskapp .` to build the image; finally, run the container with `docker run -p 5000:5000 myflaskapp` to start the application. Advanced techniques include multi-stage builds to reduce image size, data persistence through data volumes, and managing sensitive information with environment variables. The article also addresses common issues such as viewing logs and redeploying after code modifications. Docker containerization enables Flask applications to achieve "build once, run anywhere," significantly improving deployment efficiency and stability.