Intermittent Network Connectivity Due to Overloaded Overlay Network

Pods experienced intermittent network connectivity issues due to an overloaded overlay network that could not handle the traffic.

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What Happened

An overlay network (Flannel) used to connect pods was overwhelmed due to high traffic volume, resulting in intermittent packet drops and network congestion.

Diagnosis Steps

1Used kubectl exec to trace packet loss between pods and detected intermittent connectivity.
2Monitored network interfaces and observed high traffic volume and congestion on the overlay network.

Root Cause

The overlay network (Flannel) could not handle the traffic load due to insufficient resources allocated to the network component.

Fix/Workaround

• Reconfigured the overlay network to use a more scalable network plugin.
• Increased resource allocation for the network components and scaled the infrastructure to handle the load.

Lessons Learned

Ensure that network plugins are properly configured and scaled to handle the expected traffic volume.

How to Avoid

1Monitor network traffic patterns and adjust resource allocation as needed.
2Consider using more scalable network plugins for high-traffic workloads.

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