fix(helm-prereqs): re-apply MetalLB CRDs after helmfile sync to survive 2.0→2.1 upgrade - #4997
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When upgrading from a NICo 2.0 install to 2.1, the MetalLB CRDs are
deleted by helm during the upgrade:
2.0: operators/values/metallb.yaml had no crds: block → crds.enabled
defaulted to true → CRDs were helm-managed template resources,
tracked in the release manifest.
2.1: crds: enabled: false was added → CRDs should be externally managed.
On upgrade, helm sees the CRD resources in the old manifest but not the
new one (because crds.enabled=false removed them from templates) and
deletes them. setup.sh applied the CRDs via kubectl BEFORE helmfile sync,
but helm deleted them during the upgrade, leaving nothing for
metallb-config.yaml (IPAddressPool, BGPPeer, BGPAdvertisement) to apply
against — resulting in "server could not find the requested resource".
Fix: extract CRD application into a helper function (_apply_metallb_crds)
and call it both before and after helmfile sync. The post-upgrade apply is
idempotent (server-side --force-conflicts) and restores the CRDs
regardless of which direction the crds.enabled flag moved, ensuring they
exist before metallb-config.yaml is applied.
Fresh installs are unaffected: the pre-sync apply is still there for the
case where no metallb release exists yet.
Signed-off-by: Shayan Namaghi <snamaghi@nvidia.com>
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Summary by CodeRabbit
WalkthroughThe setup script manages MetalLB CRDs outside Helm. It removes Helm ownership metadata, applies rendered CRDs before and after ChangesMetalLB CRD lifecycle
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The setup flow reapplies MetalLB CRDs before and after synchronization so upgrade-time deletion does not leave LoadBalancer resources unavailable; no actionable merge-blocking risk remains after normal checks. Sequence Diagram(s)sequenceDiagram
participant SetupScript
participant Helmfile
participant KubernetesAPI
SetupScript->>KubernetesAPI: Apply rendered MetalLB CRDs
SetupScript->>Helmfile: Run helmfile sync
Helmfile-->>SetupScript: Return synchronization status
SetupScript->>KubernetesAPI: Reapply MetalLB CRDs
SetupScript->>KubernetesAPI: Wait for Established=True
SetupScript-->>KubernetesAPI: Apply site-specific MetalLB resources
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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…managed Signed-off-by: Shayan Namaghi <snamaghi@nvidia.com>
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Inline comments:
In `@helm-prereqs/setup.sh`:
- Line 488: Update the MetalLB synchronization step around helmfile sync so
existing MetalLB CRDs remain outside Helm’s deletion set during ownership
migration; do not allow the sync to delete and recreate them, preserving all
existing custom resources.
- Around line 488-495: Update the helmfile sync flow around helmfile sync -l
name=metallb to capture its exit status, invoke _apply_metallb_crds in the
failure branch, and then return the original non-zero status so restoration
cannot mask the sync error. Preserve the existing post-success CRD application
behavior and provide clear failure handling without relying on fail-fast mode.
- Around line 494-495: Update the post-upgrade flow around _apply_metallb_crds
to wait for every rendered MetalLB CRD to report Established=True before
applying site configuration. Use a finite timeout and preserve failure handling
when discovery does not become ready; do not rely on the controller’s Available
condition.
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helm-prereqs/setup.sh
jabdulvahid
approved these changes
Aug 14, 2026
….1 upgrade Three issues addressed based on CodeRabbit review: 1. Data loss prevention (critical): When helm deletes a CRD, Kubernetes garbage-collects all stored instances (IPAddressPool, BGPPeer, BGPAdvertisement, etc.). Re-applying the CRD schema restores the type but not the instances — any objects not declared in metallb-config.yaml are permanently lost. Fix: strip helm ownership labels from existing metallb CRDs before helmfile sync so helm cannot delete them. This prevents both schema and instance deletion during the crds.enabled=true to crds.enabled=false transition. 2. Failure safety (major): With set -e active, a helmfile sync failure exits before the post-sync CRD re-apply, leaving the cluster without CRDs. Fix: capture the sync exit code with || _metallb_sync_rc=$?, always attempt CRD re-apply (best-effort), then return the original non-zero status if sync failed. 3. CRD establishment race (major): kubectl apply on CRDs returns before Kubernetes sets Established=True. Applying IPAddressPool immediately after can fail with "no matches for kind". Fix: kubectl wait --for=condition=Established on the three primary CRDs before applying site configuration. Signed-off-by: Shayan Namaghi <snamaghi@nvidia.com>
jabdulvahid
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Aug 14, 2026
This was referenced Aug 14, 2026
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Aug 14, 2026
Backport of #4997 to `release/v2.1`. Cherry-picked cleanly from `8c73b2d0d`. ## Summary Upgrading from 2.0 to 2.1 via `setup.sh` caused MetalLB CRDs to be deleted mid-upgrade, leaving all LoadBalancer services in `<pending>` state and the upgrade failing at the MetalLB site config step. **Root cause:** 2.0 installed metallb with `crds.enabled` defaulting to `true` — CRDs were helm-managed template resources. The 2.1 upgrade added `crds.enabled: false`; helm deleted those CRDs from its release manifest along with all stored `IPAddressPool`/`BGPPeer`/`BGPAdvertisement` instances. **Fixes (three issues):** 1. **Data loss prevention (critical):** Strip helm ownership labels from existing metallb CRDs before `helmfile sync` so helm cannot delete them. This protects both the CRD schemas and all custom resource instances. 2. **Failure safety (major):** Capture `helmfile sync` exit code with `|| _metallb_sync_rc=$?`, always attempt CRD re-apply, then return the original error if sync failed. 3. **CRD establishment race (major):** Wait for `Established=True` on the three primary CRDs before applying site configuration. ## Related issues Fixes the 2.0→2.1 upgrade path reported in the bug. ## Type of Change - [x] **Fix** - Bug fixes ## Testing - [x] Manual testing performed Validated on dev6 — see PR #4997 for full test log. Signed-off-by: Shayan Namaghi <snamaghi@nvidia.com>
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Root cause
Upgrading from NICo 2.0 to 2.1 via
setup.shcauses MetalLB CRDs to be deleted mid-upgrade, leaving all LoadBalancer services in<pending>state.2.0:
operators/values/metallb.yamlhad nocrds:block →crds.enableddefaulted totrue→ CRDs were installed as helm-managed template resources tracked in the release manifest.2.1:
crds: enabled: falsewas added → CRDs should be managed externally viakubectl apply.On upgrade, helm sees the CRD resources in the old manifest but not in the new one (because
crds.enabled=falseremoved them from templates) and deletes them.setup.shapplied the CRDs viakubectlbeforehelmfile sync, but helm deleted them during the upgrade. Nothing re-applies them beforemetallb-config.yamlis applied, resulting in:Fix
Extract CRD application into a helper function
_apply_metallb_crdsand call it both before and afterhelmfile sync. The post-upgrade apply is idempotent (server-side--force-conflicts) and restores the CRDs regardless of upgrade direction, ensuring they exist beforemetallb-config.yamlis applied.Fresh installs are unaffected: the pre-sync apply is still present for the case where no metallb release exists yet.
Related issues
Fixes upgrade path from 2.0-rc.16 → 2.1-rc.5.
Type of Change
Breaking Changes
Testing
Fix addresses the exact failure sequence described in the bug report. The re-apply is idempotent on both fresh installs and re-runs of setup.sh.