Reviewed by Aditya Kumar · Last reviewed 2026-03-24
Architectural logic: Docker containerizes app + dependencies for portability and reproducibility. Why: 'Runs on my machine' → runs everywhere; isolate from host. Dependencies: Baked into image via Dockerfile (FROM, RUN pip install, COPY). Scalability: Same image scales...
Architectural logic: Docker containerizes app + dependencies for portability and reproducibility. Why: 'Runs on my machine' → runs everywhere; isolate from host. Dependencies: Baked into image via Dockerfile (FROM, RUN pip install, COPY). Scalability: Same image scales horizontally; registry for distribution. Cost: Smaller images = faster pull, less storage. Best practice: Multi-stage builds; pin versions; .dockerignore; non-root user.
Red Flag: Building images without version pins—non-reproducible. Pro-Move: 'We use multi-stage builds; python:3.10-slim base; layers cached—image size 200MB, build 2 min.'
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