Termination leaks pods that tolerate the disruption taint that Karpenter will not evict

[njtran]

Description

Observed Behavior: Karpenter should terminate and evict all pods scheduled to a node when terminating a Node/NodeClaim.

Karpenter skips eviction of pods that will reschedule, meaning that those pods are not evicted and cleaned up prior to instance deletion. After Karpenter successfully sends a delete request for the instance, initiating kubelet shutdown, it will immediately after remove the finalizer, thus deleting the node. This race can result in Kubelet failing to evict daemonsets and failing to deregister itself. These pods are then leaked, relying on garbage collection to clean them up.

Expected Behavior: All pods are deleted and evicted from the node, then the kubelet is able to fully gracefully delete with no leaks.

This can be solved with #621 by adding a NoExecute Taint to nodes, allowing TaintManagerEviction to delete pods. Additionally, Karpenter should wait to remove the node finalizer until the underlying CP instance is Terminated (as opposed to Terminating).

Versions:

• Chart Version:
• Kubernetes Version (kubectl version):

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[github-actions[bot]]

This issue has been inactive for 14 days. StaleBot will close this stale issue after 14 more days of inactivity.

[k8s-triage-robot]

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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/lifecycle rotten

[billrayburn]

/assign @jmdeal

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

[k8s-ci-robot]

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

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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You can:

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/close not-planned

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