Nginx web server — reverse proxy, load balancing, caching, SSL termination, and configuration.
How to use Apache httpd as a reverse proxy with mod_proxy — proxying to backend services, load balancing across multiple upstreams, WebSocket proxying, and health check configuration.
How to configure Apache httpd for production use — name-based virtual hosts, SSL/TLS with Let's Encrypt, HTTP to HTTPS redirects, mod_rewrite rules, and performance tuning with MPM.
An introduction to Envoy Proxy's architecture — listeners, clusters, filters, and the xDS dynamic configuration API. Covers static configuration for standalone use and how Envoy fits into service meshes like Istio.
Advanced Envoy traffic management — configuring retries with exponential backoff, per-request timeouts, weighted canary routing, global rate limiting, and fault injection for resilience testing.
Advanced HAProxy SSL configuration — multi-domain SNI routing from a single frontend, mutual TLS (mTLS) for service-to-service authentication, certificate management, and OCSP stapling.
A comprehensive HAProxy configuration guide covering frontends, backends, balance algorithms, active health checks, SSL termination, ACLs, rate limiting, and the runtime socket API.
Step-by-step guide to building a highly available load balancer pair with HAProxy and Keepalived — covering the full stack from VIP configuration to health checks, stats, and SSL termination.
How to configure Keepalived for automatic failover using VRRP — setting up master/backup pairs, virtual IPs, health-check scripts, and combining it with HAProxy or Nginx for zero-downtime load balancer HA.
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.
Set up Nginx as a reverse proxy with SSL termination, response caching, rate limiting, and load balancing for high-traffic applications.