DNS Is the Silent Kubernetes Bottleneck No One Talks About

When latency spikes,
everyone looks at CPU.
Very few check DNS.

Here’s what happens in real production clusters:
• High service-to-service calls
• Each call does DNS resolution
• CoreDNS under-provisioned
• ndots setting causes repeated lookups
• DNS retries multiply latency

Suddenly:
A 20ms call becomes 200ms.

But no CPU spike.
No memory pressure.
Just slow performance.

Symptoms:
🔸 Random latency spikes
🔸 Increased retransmits
🔸 Slow microservice chains
🔸 Intermittent timeouts

Most DevOps teams scale pods.
Few scale DNS.

If you're running microservices at scale,
DNS becomes part of your performance path.

Have you load tested your CoreDNS?

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Read More: https://kubeha.com/dns-is-the-silent-kubernetes-bottleneck-no-one-talks-about/
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Comments

[Nagendra Kumar]

Wonderful, this seems unknown to most of us #devops, #sre, #kubernetes, #development, #innovation, #kubeha