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CKA study material · question 561 of 1000

An administrator changes a control plane node's IP address after the cluster is built. What else must be done?

  1. Nothing — components re-read the address on their next restart
  2. Re-issue the affected certificates and restart those components
  3. Run kubeadm reset and rejoin the node
  4. Update the Node object's status.addresses field by hand
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Answer: B. Re-issue the affected certificates and restart those components

The addresses of control plane components are baked into the subject alternative names of their X.509 certificates, so changing one requires signing new certificates and restarting the components that use them.

Source: Creating a cluster with kubeadm (Kubernetes) — Instructions › Network setup

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