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CKA study material · question 881 of 1000

The kubelet was started with --hairpin-mode=promiscuous-bridge, but hairpin traffic still fails. Where is the effective mode confirmed?

  1. In the Node object's status
  2. In the kubelet's log, which records the mode it settled on
  3. In the kube-proxy ConfigMap
  4. In the CNI configuration file
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Answer: B. In the kubelet's log, which records the mode it settled on

The mode actually in force can differ from the flag for compatibility reasons, and the kubelet logs a line naming the effective hairpin mode.

Source: Debug Services (Kubernetes) — Edge case: A Pod fails to reach itself via the Service IP

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