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Scenario #45
Cluster Management
K8s v1.23, multi-cluster federation
DNS Resolution Failure in Multi-Cluster Setup
DNS resolution failed between two federated clusters due to missing DNS records.
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What Happened
DNS queries failed between two federated clusters, preventing services from accessing each other across clusters.
Diagnosis Steps
- 1Used kubectl get svc to check DNS records.
- 2Identified missing service entries in the DNS server configuration.
Root Cause
DNS configuration was incomplete, missing records for federated services.
Fix/Workaround
• Added missing DNS records manually.
• Updated DNS configurations to include service records for all federated clusters.Lessons Learned
In multi-cluster setups, DNS configuration is critical to service discovery.
How to Avoid
- 1Automate DNS record creation during multi-cluster federation setup.
- 2Regularly audit DNS configurations in multi-cluster environments.