Q1. What are common symptoms of CoreDNS performance problems?
A1. Increased latency, intermittent DNS failures (SERVFAIL), slow Kubernetes service discovery, and unexpected application downtime.
Q2: How do I monitor CoreDNS performance?
A2: Use Prometheus and Grafana dashboards tracking coredns_forward_request_duration_seconds and related metrics.
Q3: Can AWS limits cause CoreDNS issues?
A3: Yes, AWS limits DNS queries per ENI and resolver endpoints. Exceeding these limits causes throttling and dropped DNS queries.
Q4: What is NodeLocal DNSCache?
A4: NodeLocal DNSCache is a local caching solution reducing CoreDNS load by serving DNS requests directly from the node.
Q5: Why should startups prioritize DNS troubleshooting?
A5: Reliable DNS infrastructure ensures stable application performance, improves user experience, and prevents downtime.
Stay Ahead in Cloud & InfraSubscribe to get concise, engineering-first insights on scaling infrastructure, cloud architecture, DevOps, and AWS funding opportunities—delivered monthly.No noise. Just practical knowledge.
