Troubleshooting CoreDNS Resolution Failures in a Kubernetes Cluster
Symptom
In a Kubernetes cluster, CoreDNS is used to provide internal DNS services. However, during operation, occasional failures in resolving public domain names were observed. Application logs recorded UnknownHost errors.
Root Cause Analysis
Network packet capture was performed on the problematic cluster. When DNS resolution failures were log ...
Posted on Sun, 25 Oct 2026 16:56:30 +0000 by jlpulido