DNS is weird inside k8s on AWS (opens in new tab)

A ~6 minute read — just three concepts that, once you know them, change how you reason about DNS inside a cluster. While chasing some DNS timeouts recently, I went down a rabbit hole and came out with three concepts I wish I'd known earlier. None of them is exotic, but together they explain a surprising amount of "why is DNS being weird" behaviour on Kubernetes-on-AWS. ndots — why one hostname lookup can become many DNS queries NodeLocal DNS — the per-node caching layer your queries actually ...