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CKA study material · question 789 of 1000

What change must applications make to benefit from NodeLocal DNSCache?

  1. They must switch their resolver to TCP
  2. They must set dnsPolicy to None
  3. They must add the node-local address to dnsConfig
  4. None; the local cache still answers UDP queries
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Answer: D. None; the local cache still answers UDP queries

The node-local cache listens for UDP DNS queries just as CoreDNS does, so applications need no change; the upgrade to TCP happens between the cache and CoreDNS.

Source: Using NodeLocal DNSCache in Kubernetes Clusters (Kubernetes) — Motivation

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