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With tens of thousands of services, DNS lookups start timing out for five seconds at a stretch. Diagnose and fix Kubernetes DNS at scale.

The classic five-second stall is rarely CoreDNS being slow; it is UDP, conntrack races and ndots expansion. The diagnosis ladder and the NodeLocal DNSCache fix separate operators from readers of architecture blogs.

Updated Sep 2026 · 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.

20 answers per topic instead of 10, and your progress kept · no cardor unlock all 390 remaining answers · ₹2,000 / $25

UP NEXT ON YOUR JOURNEY

Next in this trackThe HPA shows a CPU number. Trace it from the container to the scaling decision, and tell me where that number lies.Next in this trackSidecar proxies cost us real memory per pod. Do ambient and Cilium-style meshes actually remove that cost, and what do they trade?Next in this trackHow do you load balance the Kubernetes control plane, and what breaks first when every client points at one API server endpoint?

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