How to Troubleshoot Kubernetes Pods That Cannot Resolve Internal Service Names

A pod may fail to resolve another service because of cluster DNS health, namespace search paths, network policy, malformed service names, or a node-specific resolver issue. Direct IP tests can work while service discovery fails.

What to check

Check DNS pod health, service and namespace names, resolver configuration, CoreDNS logs, network policy, and node placement. Test fully qualified service names from an approved diagnostic pod in the same namespace.

Recommended next step

Restore cluster DNS or correct the service reference and verify behavior across nodes. Avoid hard-coding pod IPs, since they change as workloads reschedule.

How Informatix Systems can help

Informatix Systems provides Kubernetes and container platform engineering services. We can review the environment, trace the problem through its dependencies, and help plan a practical resolution. Contact us with the system involved, when the issue began, and non-sensitive error details.