beginnerKubernetes Architecture: Control Plane & Worker Nodes
Why does Kubernetes recommend an odd number of control plane nodes?
etcd uses Raft consensus requiring a strict majority quorum. 3 nodes tolerate 1 failure (quorum=2), 5 nodes tolerate 2 failures (quorum=3). 4 nodes also only tolerate 1 failure same as 3 -- the odd-count step-up is meaningful.
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