Which control plane component is responsible for updating the node Ready condition

Question

Options

• AThe kube-oroxy.
• BThe node controller.
• CThe kubelct.
• DThe kube-apiserver

• A
  3% (1)
• B
  90% (28)
• C
  6% (2)

Explanation

Node Controller (option B) is correct because it runs inside kube-controller-manager and is specifically responsible for monitoring node health - it updates the Ready condition on Node objects based on whether it receives heartbeats from nodes within the configured timeout period.

Why the distractors are wrong:

• A (kube-proxy): A data-plane component that manages network rules on each node; it has no role in reporting node health to the control plane.
• C (kubelet): The kubelet sends heartbeats (NodeStatus updates) to the API server, but it does not set the Ready condition - that decision belongs to the node controller.
• D (kube-apiserver): Acts as the API gateway and persists state in etcd, but it does not evaluate node health or update conditions autonomously.

Memory tip: Think of the node controller as the "health monitor" - the kubelet is the patient reporting its vitals, but the node controller is the doctor who reads those vitals and stamps the chart with "Ready" or "Not Ready."

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