Building a Multi-Container Flask, PostgreSQL, and NGINX Stack Using Docker Compose — Including Every Failure Encountered.

A production-style application deployment rarely succeeds on the first attempt. This project implemented a containerized multi-service architecture using Docker Compose, integrating Flask as the application layer, PostgreSQL as the persistence layer, Gunicorn as the WSGI runtime, and NGINX as the reverse proxy ingress service. The intended architecture was: Client → NGINX → Flask → PostgreSQL The objective extended beyond simply getting containers running. The implementation focused on: Multi-co