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Scenario #185
Networking
K8s v1.18, GKE
Network Partition Between Node Pools in Multi-Zone Cluster
Pods in different node pools located in different zones experienced network partitioning due to a misconfigured regional load balancer.
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What Happened
The regional load balancer was not properly configured to handle traffic between node pools located in different zones, causing network partitioning between pods in different zones.
Diagnosis Steps
- 1Used kubectl exec to verify pod-to-pod communication between node pools and found packet loss.
- 2Inspected the load balancer configuration and found that cross-zone traffic was not properly routed.
Root Cause
The regional load balancer was misconfigured, blocking traffic between nodes in different zones.
Fix/Workaround
• Updated the regional load balancer configuration to properly route cross-zone traffic.
• Re-deployed the affected pods to restore connectivity.Lessons Learned
Ensure proper configuration of load balancers to support multi-zone communication in cloud environments.
How to Avoid
- 1Test multi-zone communication setups thoroughly before going into production.
- 2Automate the validation of load balancer configurations.