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The 1.34.9 master upgrade hard-failed `kubeadm upgrade apply` preflight: CoreDNS
is at v1.12.4 (Keel auto-bumped it 1.12.1 -> 1.12.4 on 2026-05-26 via a stale
kube-system out-of-band annotation), and 1.12.4 is ahead of kubeadm 1.34.9's
bundled corefile-migration table ("start version not supported").
- scripts/update_k8s.sh: master `kubeadm upgrade apply` now runs with
`--ignore-preflight-errors=CoreDNSMigration,CoreDNSUnsupportedPlugins
--skip-phases=addon/coredns`. A dry-run proved --ignore ALONE would overwrite
our custom split-horizon Corefile with kubeadm's default AND downgrade the
image; --skip-phases leaves CoreDNS 100% untouched while the control plane
upgrades. CoreDNS is pinned off Keel (keel.sh/policy=never) to stop the drift.
- stacks/k8s-version-upgrade/scripts/upgrade-step.sh: fix the preflight
quiet-baseline (settle-window) check, which silently no-op'd on the ghcr
claude-agent-service image's busybox `date` (can't parse ISO8601). Now tries
GNU then busybox `-D`, and warns+skips on parse failure (no silent fail-open).
- docs: runbook + architecture document the CoreDNS handling.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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| job-template.yaml | ||
| main.tf | ||
| terragrunt.hcl | ||