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CKA study material · question 572 of 1000

Nodes cloned from a single virtual machine template fail to join a cluster correctly. Which two attributes must be unique per node? Choose two.

  1. MAC address
  2. Kernel version
  3. product_uuid
  4. Container runtime version
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Answer: A. MAC address
C. product_uuid

Kubernetes identifies nodes by hostname, MAC address and product_uuid; cloned virtual machines often share the latter two, and the installation can fail as a result.

Source: Installing kubeadm (Kubernetes) — Verify the MAC address and product_uuid are unique for every node

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