Unstable Network Due to Overlay Network Misconfiguration

The overlay network was misconfigured, leading to instability in pod communication.

Find this helpful?

What Happened

After deploying an application, pod communication became unstable due to misconfiguration in the overlay network.

Diagnosis Steps

1Reviewed the CNI plugin (Calico) logs and found incorrect IP pool configurations.
2Identified that the overlay network was not providing consistent routing between pods.

Root Cause

Incorrect overlay network configuration.

Fix/Workaround

• Corrected the IP pool configuration in the Calico settings.
• Restarted Calico pods to apply the fix.

Lessons Learned

Carefully validate overlay network configurations to ensure proper routing and stability.

How to Avoid

1Test network configurations in staging environments before deploying to production.
2Regularly audit network configurations for consistency.