Inconsistent Pod Network Connectivity in Multi-Region Cluster

Pods in a multi-region cluster experienced inconsistent network connectivity between regions due to misconfigured VPC peering.

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What Happened

The VPC peering between two regions was misconfigured, leading to intermittent network connectivity issues between pods in different regions.

Diagnosis Steps

1Used kubectl exec to check network latency and packet loss between pods in different regions.
2Inspected VPC peering settings and found that the correct routes were not configured to allow cross-region traffic.

Root Cause

Misconfigured VPC peering between the regions prevented proper routing of network traffic.

Fix/Workaround

• Updated VPC peering routes and ensured proper configuration between the regions.
• Tested connectivity after the change to confirm resolution.

Lessons Learned

Ensure that all network routing and peering configurations are validated before deploying cross-region clusters.

How to Avoid