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CKA study material · question 693 of 1000

An operator scripts a rolling reboot that drains five nodes at once. What risk does the documentation identify?

  1. The API server rejects concurrent eviction requests
  2. Cordoned nodes cannot be uncordoned until all drains finish
  3. Concurrent drains can together breach the disruption budgets each one separately respects
  4. DaemonSet Pods are deleted rather than left in place
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Answer: C. Concurrent drains can together breach the disruption budgets each one separately respects

kubectl drain is meant to be issued to a single node at a time; several drains each honouring a budget in isolation can still remove more replicas than the budget allows.

Source: Safely Drain a Node (Kubernetes) — Use kubectl drain to remove a node from service

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