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What is the recommended order when upgrading a Kubernetes cluster?

easy📝 Conceptual Q11 of 15
Kubernetes - Production Best Practices
What is the recommended order when upgrading a Kubernetes cluster?
AUpgrade all nodes simultaneously
BUpgrade worker nodes first, then control plane nodes
CUpgrade control plane nodes first, then worker nodes
DUpgrade only the worker nodes
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of control plane nodes

    Control plane nodes manage the cluster state and API server, so they must be stable first.

  2. Step 2: Upgrade worker nodes after control plane

    Worker nodes run workloads and depend on the control plane, so upgrade them after control plane nodes.

  3. Final Answer:

    Upgrade control plane nodes first, then worker nodes -> Option C

  4. Quick Check:

    Control plane first, workers second = A [OK]
Quick Trick: Always upgrade control plane nodes before worker nodes [OK]
Common Mistakes:
  • Upgrading worker nodes before control plane
  • Upgrading all nodes at once causing downtime
  • Skipping control plane upgrade

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