High Latency in Inter-Namespace Communication

High latency observed in inter-namespace communication, leading to application timeouts.

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What Happened

Pods in different namespaces experienced significant latency while trying to communicate, causing service timeouts.

Diagnosis Steps

1Monitored network latency with kubectl and found inter-namespace traffic was unusually slow.
2Checked network policies and discovered that overly restrictive policies were limiting traffic flow between namespaces.

Root Cause

Overly restrictive network policies blocking inter-namespace traffic.

Fix/Workaround

• Modified network policies to allow traffic between namespaces.
• Verified that latency reduced after policy changes.

Lessons Learned

Over-restrictive policies can cause performance issues.

How to Avoid

1Apply network policies with careful consideration of cross-namespace communication needs.
2Regularly review and update network policies.