Pod IP Collision Due to Insufficient IP Range

Pod IP collisions occurred due to insufficient IP range allocation for the cluster.

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What Happened

Pods started having overlapping IPs, causing communication failures between pods.

Diagnosis Steps

1Analyzed pod IPs and discovered that there were overlaps due to an insufficient IP range in the CNI plugin.
2Identified that the IP range allocated during cluster creation was too small for the number of pods.

Root Cause

Incorrect IP range allocation when the cluster was initially created.

Fix/Workaround

• Increased the pod network CIDR and restarted the cluster.
• Re-deployed the affected pods to new IPs without collisions.

Lessons Learned

Plan IP ranges appropriately during cluster creation to accommodate scaling.

How to Avoid

1Ensure that the IP range for pods is large enough to accommodate future scaling needs.
2Monitor IP allocation and usage metrics for early detection of issues.