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CKA study material · question 790 of 1000

Cluster DNS has stopped working. Which two checks does the troubleshooting guide begin with? Choose two.

  1. That the CoreDNS Pods are Running
  2. That the kube-dns Service has endpoints
  3. That every Pod has dnsPolicy set to None
  4. That kube-proxy is running in IPVS mode
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Answer: A. That the CoreDNS Pods are Running
B. That the kube-dns Service has endpoints

The guide checks that the DNS Pods are running and that the Service fronting them has endpoints — a Service with none resolves nothing, however healthy the Pods look.

Source: Debugging DNS Resolution (Kubernetes) — Check if the DNS pod is running

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