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CKA study material · question 552 of 1000

On a single-machine kubeadm cluster, ordinary workloads stay Pending. Which action lets them run?

  1. Add a toleration for node.kubernetes.io/unschedulable to every Pod
  2. Run kubectl uncordon on the control plane node
  3. Remove the node-role.kubernetes.io/control-plane:NoSchedule taint
  4. Set --register-node=true on the kubelet
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Answer: C. Remove the node-role.kubernetes.io/control-plane:NoSchedule taint

kubeadm taints control plane nodes with node-role.kubernetes.io/control-plane:NoSchedule so workloads stay off them; removing that taint is what makes a single-node cluster usable.

Source: Creating a cluster with kubeadm (Kubernetes) — Control plane node isolation

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