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Scenario #147
Networking
K8s v1.19, on-premise
Pod-to-Pod Communication Failure Due to Network Policy
Pod-to-pod communication failed due to an overly restrictive network policy.
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What Happened
Pods in the same namespace could not communicate because an ingress network policy blocked traffic between them.
Diagnosis Steps
- 1Examined network policies and identified that the ingress policy was too restrictive.
- 2Verified pod logs and found that traffic was being denied by the network policy.
Root Cause
Overly restrictive network policy that blocked pod-to-pod communication.
Fix/Workaround
• Updated the network policy to allow traffic between pods in the same namespace.
• Applied the updated policy and verified that communication was restored.Lessons Learned
Carefully review network policies to ensure they do not unintentionally block necessary traffic.
How to Avoid
- 1Use a policy auditing tool to ensure network policies are properly defined and do not block essential traffic.
- 2Regularly test network policies in staging environments.