The article explains how a new WebSocket domain caused Nginx worker processes to repeatedly shut down, leading to timeout alerts, and provides step‑by‑step investigation methods and a configuration fix using the worker_shutdown_timeout directive.
The article explains Nginx’s master‑worker architecture, showing how the master process handles signals, restarts workers, and performs hot configuration or binary reloads, while workers use an event‑driven epoll loop with an accept‑mutex to efficiently process connections and balance load across cores without multithreading.
This article explains the three types of Nginx processes—master, worker, and cache—detailing each one's responsibilities, from configuration loading and socket management to request handling, cache indexing, and inter‑process communication, while also covering smooth reloads, upgrades, and cache index management.
