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What limits does Kubernetes place on a Pod's DNS search domain list?

  1. At most 6 domains, as in classic resolv.conf
  2. At most 32 domains totalling no more than 2048 characters
  3. At most 3 domains, matching the nameserver limit
  4. No limit; the container runtime decides
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Answer: B. At most 32 domains totalling no more than 2048 characters

Kubernetes accepts up to 32 search domains and 2048 total characters, applied to the node's resolver file, the Pod's dnsConfig and the merged result.

Source: DNS for Services and Pods (Kubernetes) — DNS search domain list limits

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