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Open Source Summit + Embedded Linux Conference North America... has ended
May 18-20, 2026
Minneapolis, MN
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Note: The schedule is subject to change.

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Monday May 18, 2026 4:30pm - 5:10pm CDT
Is it DNS or is it network? & why is answer always DNS? In K8s, most clusters quietly rely on /etc/resolv.conf on every node for all non-service name resolution. At scale, this dependency becomes a liability, reducing caching & observability while causing fragile forwarding, higher latency, upstream resolver overload, and host-level divergence in multi-cloud environments

This talk will explain how K8s actually consumes node DNS today & then present two solutions: CoreDNS for large, complex clusters; dnsmasq for medium scale that bring deterministic caching, controlled forwarding, traffic steering, and real visibility—turning DNS from black box into an engineered system component

Attendees will gain a framework to choose DNS implementation strategies by understanding trade-offs based on cluster scale, workload type and platform maturity. We’ll compare CoreDNS & dnsmasq, surface real failure modes, & show how different designs affect latency, reliability, & blast radius.
Speakers
avatar for Shaheen Sayyed

Shaheen Sayyed

Site Reliability Engineer, Red Hat
Coding Enthusiast with a keen interest in Building Scalable Cloud Applications
avatar for Ankur Singh

Ankur Singh

Senior Site Reliability Engineer, Red Hat
A diverse Software Engineer with experience as DevOps Engineer, Platform Engineer & Site Reliability Engineer.
Monday May 18, 2026 4:30pm - 5:10pm CDT
200F (Level Two)
  Cloud + Orchestration
  • Audience Experience Level Beginner
  • Slides Attached Yes

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