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CKA study material · question 995 of 1000

During a graceful node shutdown, why can a Pod tolerating node.kubernetes.io/not-ready:NoSchedule still not start there?

  1. The node's taints are removed during shutdown
  2. The scheduler stops considering the node entirely
  3. The Pod's toleration expires with tolerationSeconds
  4. The kubelet rejects Pods at admission once shutdown is detected
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Answer: D. The kubelet rejects Pods at admission once shutdown is detected

Beyond setting a NotReady condition the kubelet refuses Pods during the PodAdmission phase, so a toleration cannot get one onto a node that is shutting down.

Source: Node Shutdowns (Kubernetes) — Graceful node shutdown › Configuring graceful node shutdown

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