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CKA study material · question 518 of 1000

Every zone in a large multi-zone cluster reports unhealthy at the same moment. How does the node controller behave?

  1. It evicts at the reduced secondary rate across all zones
  2. It performs no evictions, treating this as its own connectivity fault
  3. It evicts at the normal rate, since no zone is healthier than another
  4. It deletes the Node objects so the cloud provider can replace them
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Answer: B. It performs no evictions, treating this as its own connectivity fault

When no zone is healthy the likeliest explanation is a control plane connectivity problem, not simultaneous failure everywhere, so the node controller does nothing rather than evacuating the whole cluster.

Source: Nodes (Kubernetes) — Node controller › Rate limits on eviction

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