Overview

Deploy Flask and Django behind Nginx and Gunicorn with confidence instead of copy paste guesswork. Many teams stand up a Python service with a one line Gunicorn command, then hit 502 and 504 errors, CSRF failures, slow spikes, and mysterious timeouts the moment real traffic arrives. Misaligned Nginx and Gunicorn settings, fragile worker choices, and missing proxy headers quietly erode reliability. This book walks through a complete production architecture for Gunicorn behind Nginx, showing how requests flow, where buffering belongs, how to size workers and threads, and how to keep Flask and Django stable under real load. Every setting is tied to observable behavior so you know why it matters, not just what to type. Understand the full request path from client through Nginx, Gunicorn, and your WSGI app, including buffering, keepalive, and error codes. Configure gunicorn conf py with a clear strategy for bind targets, worker counts, worker_class, threads, timeouts, keepalive, and recycling. Choose between sync, gthread, and async workers such as gevent and eventlet, and set worker_connections and thread counts with real CPU and IO constraints. Align Nginx proxy timeouts, buffering, upstream keepalive, and static file routing so your reverse proxy truly protects your application server. Harden Django behind proxies with ALLOWED_HOSTS, SECURE_PROXY_SSL_HEADER, and CSRF settings that handle scheme, Origin, and Referer safely. Apply production patterns in Flask using an app factory, clean configuration loading, structured logging, and safe ProxyFix settings for real client IPs. Build observability across the stack with Gunicorn access and error logs, Nginx log_format and upstream timing fields, and request IDs that flow end to end. Run a repeatable performance tuning loop with steady state and spike load tests, then interpret throughput, tail latency, error rates, and saturation signals. Support high concurrency features such as streaming responses, server sent events, and WebSockets using the right workers, buffering controls, timeouts, and limits. Tune OS and kernel limits such as file descriptors, backlog queues, and basic network settings, and avoid nofile and somaxconn outages. Containerize Gunicorn with correct PID 1 behavior, signal handling, worker_tmp_dir choices, non root users, and a clean image layout. Use systemd units and socket activation for process supervision, then perform zero downtime reloads and controlled rollouts. Follow incident playbooks for upstream timeouts, redirect loops, CSRF errors, memory growth, stuck workers, and load spikes with safe mitigation steps. The guide is code heavy, with production ready Nginx server blocks, Gunicorn configuration files, systemd service units, Dockerfiles, and concrete Flask and Django snippets that you can adapt directly into live services. Grab your copy today and turn your Gunicorn deployments into predictable, resilient Python web services.

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