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CKA study material · question 525 of 1000

Three control plane nodes each run kube-scheduler, yet only one is making scheduling decisions. What arranges that?

  1. A readiness probe that fails on the standby replicas
  2. Leader election through the Lease API
  3. A NetworkPolicy that isolates the standby schedulers
  4. An anti-affinity rule that admits only one scheduler Pod
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Answer: B. Leader election through the Lease API

Kubernetes uses Leases so that only one instance of kube-scheduler or kube-controller-manager is active at a time in a highly available control plane, with the rest on standby.

Source: Leases (Kubernetes) — Leader election

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