Phase: 2 — Networking Foundations + L4 Goal: Build a production-grade L4 TCP load balancer with health checking, circuit breakers, and connection draining. This is what AWS NLB and HAProxy do — you'll build it from scratch.
Background in this wiki: TCP/IP guide Ch 57 (production load balancing): the
lbdrainlab measured 0 errors with draining vs 24 withkill -9, plus a PROXY protocol parser; Ch 46 (prober: latency histograms); HTTPS guide Ch 9 and Ch 21 (rate limits, retries, breakers).