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CKA study material · question 565 of 1000

How many machines does the external etcd topology require, at a minimum, compared with the stacked one?

  1. The same three, with etcd running as a static Pod on each
  2. Six: three for the control plane and three for etcd
  3. Four: three control plane nodes and one etcd host
  4. Five, matching etcd's recommended production size
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Answer: B. Six: three for the control plane and three for etcd

External etcd decouples the two failure domains but doubles the host count: three control plane machines and three etcd machines at a minimum.

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

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