UPSTREAM: 141913: restore FileRefreshDuration poll for file-backed CAs - #2771
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fsnotify watches a single inode. Atomic rename, overlay, and bind-mount updates can leave the watch on stale content, so authenticators keep rejecting still-valid client certs with x509 unknown authority (HTTP 401). kubernetes#104102 replaced the poll with fsnotify but left FileRefreshDuration unused. Restore the poll alongside fsnotify. Upstream: kubernetes#141913. Signed-off-by: Arpit Bhagat <arpitbhagat@users.noreply.github.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. WalkthroughDynamic CA and serving certificate controllers now poll their files at ChangesCertificate reload polling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This restores periodic certificate-file reload polling to recover from missed filesystem events. No concrete merge-blocking risk is identified in the current change. Sequence Diagram(s)sequenceDiagram
participant CertificateController
participant WorkQueue
participant CertificateFile
CertificateController->>WorkQueue: enqueue workItemKey every FileRefreshDuration
WorkQueue->>CertificateFile: read certificate or CA file
CertificateFile-->>CertificateController: return updated content
CertificateController->>CertificateController: publish reloaded content
🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (14 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In
`@staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_cafile_content_linux_test.go`:
- Line 69: Update the t.Cleanup callback around syscall.Unmount to check its
returned error and report any cleanup failure through the test handle, rather
than discarding it. Preserve the existing detached unmount behavior and use the
existing t symbol for reporting.
In
`@staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_cafile_content_test.go`:
- Line 96: Update the test worker setup around c.runWorker so the queue is
explicitly shut down when the test completes, allowing a worker blocked in
queue.Get to exit instead of leaking; preserve the existing context cancellation
and update-processing behavior.
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staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_cafile_content.gostaging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_cafile_content_linux_test.gostaging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_cafile_content_test.gostaging/src/k8s.io/apiserver/pkg/server/dynamiccertificates/dynamic_serving_content.go
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Address review: TestFileRefreshPollReloadsWithoutFsnotify must ShutDown the workqueue, and the bind-mount test must not ignore Unmount errors. Signed-off-by: Arpit Bhagat <arpitbhagat@users.noreply.github.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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OCPBUGS-95087 is the tracker for this carry. This PR is the kubelet (
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What type of PR is this?
/kind bug
What this PR does / why we need it:
Restore the unused
FileRefreshDurationpoll onDynamicFileCAContent(and the matching leftover onDynamicCertKeyPairContent) so file-backed client CAs reload when fsnotify stays on a stale inode.#104102replaced the poll with fsnotify but leftFileRefreshDurationunused. A successfulwatchCAFilethen blocks for the life of the process. After an atomic rewrite of/etc/kubernetes/kubelet-ca.crt(MCOwriteFileAtomically/ rename → new inode), kubelet keeps the old in-memory roots. TLS still succeeds; HTTP auth fails withx509: certificate signed by unknown authority→ HTTP 401. The same file is consumed by kube-rbac-proxy (--client-ca-file=/etc/kubernetes/kubelet-ca.crt).ConfigMapCAControllerstill polls atFileRefreshDuration. This puts file-backed CAs back on that safety net, alongside fsnotify.This is a carry of kubernetes#141913 (
UPSTREAM: 141913:). kubernetes 1.36 PR kubernetes#136762 reloads TLS advertised CAs only; it does not fix this authenticator 401.This PR fixes kubelet (
:10250).TargetDown{job="crio"}is scraped from kube-rbac-proxy on:9637, which vendorsk8s.io/apiserverindependently. A matching vendor poll onopenshift/kube-rbac-proxyis required for that alert.Which issue(s) this PR is related to:
https://issues.redhat.com/browse/OCPBUGS-95087
Upstream: kubernetes#141913 (not merged; backport validation will need a top-level approver until it is)
Special notes for your reviewer:
FileRefreshDurationstays1m(same asConfigMapCAController). Do not use delete+recreate of the CA file as a poll test:loadCABundleerrors and workqueue retries can false-pass.@p0lyn0mialLoaded a new CA Bundle and Verifier./assign @p0lyn0mial
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: