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CKA study material · question 543 of 1000

A cluster was built with a single control plane node and no --control-plane-endpoint. The team now wants to add two more control plane nodes for high availability. What does kubeadm support?

  1. Running kubeadm init phase control-plane-endpoint to add one retroactively
  2. Nothing — kubeadm does not support converting such a cluster to highly available
  3. Joining the new nodes with --control-plane and letting kubeadm set the endpoint
  4. Editing the ClusterConfiguration ConfigMap and restarting each API server
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Answer: B. Nothing — kubeadm does not support converting such a cluster to highly available

kubeadm does not support that conversion: a cluster built without the shared endpoint cannot be made highly available afterwards, so the endpoint has to be decided at init time.

Source: Creating a cluster with kubeadm (Kubernetes) — Considerations about apiserver-advertise-address and ControlPlaneEndpoint

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