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Remove Exam Defense Q&A from documentation

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Gopikanta Shill 2026-05-19 04:02:59 +02:00
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@ -333,29 +333,4 @@ Hostinger & KVM 1 (4 GB) & \$5.99 \\
All content reviewed, tested, and adapted. Student understands all components.
% =============================================================
\section{Exam Defense Preparation}
% =============================================================
\textbf{Q: How does HTTPS work?}\\
A: Caddy uses the ACME protocol to automatically get a free Let's Encrypt TLS certificate for the Azure DNS hostname. It renews every 90 days.
\textbf{Q: What if a container crashes?}\\
A: \texttt{restart: always} in docker-compose.yaml. Docker auto-restarts failed containers. Docker starts on boot via systemd.
\textbf{Q: How are secrets managed?}\\
A: \texttt{.env} file (gitignored). Docker Compose injects vars into containers. \texttt{env.example} has template without values.
\textbf{Q: How do you back up the database?}\\
A: \texttt{backup-db.sh} runs \texttt{pg\_dump} via SSH inside the PostgreSQL container. SQL dump saved locally.
\textbf{Q: Can deployment be reproduced?}\\
A: Yes. \texttt{prepare-app.sh} creates all Azure resources from scratch via CLI. \texttt{remove-app.sh} deletes everything. No web UI needed.
\textbf{Q: Why 5 containers?}\\
A: Separation of concerns. Caddy handles HTTPS, Nginx serves static files, Node.js handles API logic, PostgreSQL stores data, Redis caches queries. Each can be scaled independently.
\textbf{Q: How does caching work?}\\
A: Redis caches \texttt{GET /api/tasks} for 30 seconds. Write operations invalidate the cache.
\end{document}