# nginx

Diagnose and fix Nginx 502 Bad Gateway errors when proxying to upstream backends — check sockets, timeouts, and upstream health.

Resolve Nginx 'Too many open files' errors by increasing worker_rlimit_nofile, system ulimits, and kernel file descriptor limits.

Configure Nginx upstream load balancing with round robin, least connections, and IP hash strategies including health checks and failover.

Implement Nginx rate limiting using limit_req and limit_conn to protect APIs from abuse, brute force, and traffic spikes in production.

Security headers and configuration reference — copy-paste snippets for Nginx, Kubernetes Ingress, Cloudflare, and Helmet.js.

Set up Nginx as a reverse proxy with SSL termination, response caching, rate limiting, and load balancing for high-traffic applications.

A practical comparison of Kubernetes Ingress and Gateway API, with a migration strategy that won't take down your production traffic.