Misconfigured DNS Resolvers Leading to Service Discovery Failure

Service discovery failed due to misconfigured DNS resolvers.

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What Happened

A misconfigured DNS resolver in the CoreDNS configuration caused service discovery to fail for some internal services.

Diagnosis Steps

1Checked CoreDNS logs and found that it was unable to resolve certain internal services.
2Verified that the DNS resolver settings were pointing to incorrect upstream DNS servers.

Root Cause

Incorrect DNS resolver configuration in the CoreDNS config map.

Fix/Workaround

• Corrected the DNS resolver settings in the CoreDNS configuration.
• Re-applied the configuration and verified that service discovery was restored.

Lessons Learned

Always validate DNS resolver configurations during cluster setup.

How to Avoid