fix(dns): repoint k8s-gateway fallthrough off the decommissioned PVE DNS VIP #179

2026-07-14T00:55:58Z

k.renner commented

2026-07-14 00:55:58 +00:00

Root cause

k8s-gateway's renner.uno fallthrough forwarder still pointed at the decommissioned Proxmox DNS HA VIP 10.2.40.53. Every non-Ingress renner.uno name (device/service hostnames like udm.renner.uno) dead-ended in SERVFAIL/timeout.

A routine home-assistant pod restart on 2026-07-14 forced HA to re-resolve its device hostnames → ~1374 entities unavailable, ~30 config entries stuck (ZHA, Shelly, UniFi, Bluetooth, cloud). A long-running pod had masked this because its connections predated the need to re-resolve.

Fix

Point the fallthrough at the UDM (10.2.40.1 / fd00::1), which serves the split-horizon renner.uno zone (verified: it answers udm.renner.uno). Also scrub the stale 10.2.40.53 refs in coredns-config comment, bootstrap.sh (DNS_SERVER), and the gatus monitor (which was still probing the dead VIP, so it never usefully alerted).

Live state

A live hotfix is already applied to the running k8s-gateway ConfigMap (forward . 10.2.40.1 fd00::1) + restart — DNS is restored now. This PR makes it durable. Merge promptly so a Flux reconcile doesn't revert the hotfix in the interim.

🤖 Generated with Claude Code

## Root cause k8s-gateway's `renner.uno` fallthrough forwarder still pointed at the **decommissioned** Proxmox DNS HA VIP `10.2.40.53`. Every non-Ingress `renner.uno` name (device/service hostnames like `udm.renner.uno`) dead-ended in SERVFAIL/timeout. A routine `home-assistant` pod restart on 2026-07-14 forced HA to re-resolve its device hostnames → **~1374 entities unavailable, ~30 config entries stuck** (ZHA, Shelly, UniFi, Bluetooth, cloud). A long-running pod had masked this because its connections predated the need to re-resolve. ## Fix Point the fallthrough at the **UDM (`10.2.40.1` / `fd00::1`)**, which serves the split-horizon `renner.uno` zone (verified: it answers `udm.renner.uno`). Also scrub the stale `10.2.40.53` refs in `coredns-config` comment, `bootstrap.sh` (`DNS_SERVER`), and the `gatus` monitor (which was still probing the dead VIP, so it never usefully alerted). ## Live state A **live hotfix is already applied** to the running k8s-gateway ConfigMap (`forward . 10.2.40.1 fd00::1`) + restart — DNS is restored now. This PR makes it durable. **Merge promptly** so a Flux reconcile doesn't revert the hotfix in the interim. 🤖 Generated with [Claude Code](https://claude.com/claude-code)

k.renner added 1 commit 2026-07-14 00:55:58 +00:00

fix(dns): repoint k8s-gateway fallthrough off the decommissioned PVE DNS VIP 12c2668865

The renner.uno fallthrough forwarder still pointed at the Proxmox DNS HA VIP
10.2.40.53, which is decommissioned/unreachable. Every non-Ingress renner.uno
name (device/service hostnames like udm.renner.uno) therefore dead-ended in
SERVFAIL/timeout. A routine home-assistant pod restart on 2026-07-14 forced HA
to re-resolve its device hostnames and left ~1374 entities unavailable / ~30
config entries stuck (ZHA, Shelly, UniFi, Bluetooth, cloud integrations).

Point the fallthrough at the UDM (10.2.40.1 / fd00::1), which serves the
split-horizon renner.uno zone (verified: it answers udm.renner.uno). Also
scrub the stale 10.2.40.53 references in the CoreDNS comment, bootstrap.sh
DNS_SERVER, and the Gatus monitor (which was pointlessly probing the dead VIP).

A live hotfix has already been applied to the k8s-gateway ConfigMap to restore
resolution; this makes it durable so Flux does not revert it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PwcQMntG9y9XRkNMPDq2fe

k.renner merged commit 94a3d7736f into master

2026-07-14 00:56:50 +00:00

k.renner referenced this issue from a commit

2026-07-14 00:56:52 +00:00

Merge pull request 'fix(dns): repoint k8s-gateway fallthrough off the decommissioned PVE DNS VIP' (#179) from worktree-fix-k8s-gateway-dns-upstream into master

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Reference: konairius/homelab#179