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CKA study material · question 563 of 1000

You run kubeadm join --control-plane on a second machine without any extra etcd configuration. What happens to etcd?

  1. The node uses the first node's etcd member remotely
  2. A local etcd member is created on the joining node
  3. Nothing; etcd must be configured separately before the join succeeds
  4. An external etcd cluster is provisioned automatically
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Answer: B. A local etcd member is created on the joining node

Stacked etcd is kubeadm's default topology: kubeadm init and kubeadm join --control-plane each create a local etcd member without being asked.

Source: Options for Highly Available Topology (Kubernetes) — Stacked etcd topology

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