Walk me through nginx internals: what do the master and workers each do, and how does one worker hold thousands of connections?

The answer that lands is about one epoll loop per core, not config snippets. Master versus worker duties, the arithmetic of worker_connections, and the limits people forget to raise.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.