How CoreDNS Powers Service Discovery in Kubernetes

Short summary

CoreDNS is Kubernetes' DNS server that translates service names into IP addresses, allowing applications to communicate without hardcoded IP configurations. Running in the kube-system namespace, it automatically creates DNS records for Services, Pods, and Namespaces—typically resolving within milliseconds. The post explains the resolution flow with examples, provides kubectl troubleshooting commands (nslookup, logs), and covers headless services for StatefulSets.

• •CoreDNS eliminates need for hardcoded IP addresses in Kubernetes applications
• •Automatically creates DNS records for Services, Pods, and Namespaces
• •Includes practical kubectl debugging commands and StatefulSet edge cases

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