Pods using csi volumes fail to terminate if csi driver pods have been evicted

[juan-lee]

What steps did you take and what happened:
Pods that mount volumes provided by csi drivers fail to terminate if the corresponding csi driver has been evicted or is missing. kubelet gets blocked when trying to unmount because the csi driver isn't available.

I observed this issue when cluster-autoscaler tried to rebalance pods to another node. My pod was stuck terminating because the secret-store-csi volume was evicted before kubelet could unmount the pods volume.

What did you expect to happen:
kubelet dependencies shouldn't be evicted before pods dependent on the drivers are successfully terminated.

Anything else you would like to add:
Consider having csi daemonsets install drivers to the host managed by systemd similar to cni drivers. This will prevent drivers from disappearing before kubelet is done with them.

KEP: kubernetes/enhancements#1003

Which provider are you using:
Azure KeyVault

Environment:

• Secrets Store CSI Driver version: (use the image tag): v1.0.0.2
• Kubernetes version: (use kubectl version): v1.21.9

[aramase]

@juan-lee thanks for raising this issue. This is an issue across all CSI drivers and seems like a good enhancement to have in Kubernetes to control order in which pods are scheduled/deleted. Similar issue arises during node scale up event when workload pods start running before the CSI driver is running on th node. Kubelet retries the volume mount and it eventually succeeds but can take order of minutes some time.

Consider having csi daemonsets install drivers to the host managed by systemd similar to cni drivers. This will prevent drivers from disappearing before kubelet is done with them.

this solves the problem where the service doesn't stop until the node goes away but introduces a problem where the service keeps runnings even if csi driver is uninstalled.

KEP: kubernetes/enhancements#1003

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[nilekhc]

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[aramase]

/remove-lifecycle stale

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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/close not-planned

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