Home DNS failover, taken too far on purpose

September 2026 — you would rather read this than do it. Good. I did it so you don’t have to.

Every home network has one thing that, when it breaks, makes everything look broken: DNS. The router still routes, the fibre still carries bits, the NAS still serves — and nobody in the house can open a page. If you run an ad-blocking resolver (AdGuard Home, in my case, in Kubernetes), you have also made DNS depend on the most complicated thing you own.