Docker 从入门到实践

🎯Hands‑on Docker practice and revision notes — includes commands, outputs, and experiments with images, containers, networking, and lifecycle management. A practical guide for learning and revising Docker fundamentals.

🎯Minimal Flask application containerized with Docker — exposes a single JSON endpoint ({"message":"Hey There Python"}) running on port 3000 inside the container and mapped to port 4000 on the host. Demonstrates Python + Flask basics, Docker image building, container execution, and lightweight API deployment.