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CKA study material · question 512 of 1000

A cluster's control plane needs to decide whether a node is still alive. Which two mechanisms does a node use to report that it is? Choose two.

  1. An entry appended to the node's audit log
  2. Updates to the .status of its own Node object
  3. Renewal of a Lease object in the kube-node-lease namespace
  4. A periodic write to the kubernetes Service endpoint list
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Answer: B. Updates to the .status of its own Node object
C. Renewal of a Lease object in the kube-node-lease namespace

Node heartbeats take exactly two forms: status updates on the Node object, and renewal of that node's Lease in kube-node-lease. Audit logs and Service endpoints play no part in liveness.

Source: Nodes (Kubernetes) — Node heartbeats

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