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Scenario #191
Networking
K8s v1.21, AKS
Port Collision Between Services Due to Missing Port Ranges
Two services attempted to bind to the same port, causing a port collision and service failures.
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What Happened
The services were configured without specifying unique port ranges, and both attempted to use the same port on the same node, leading to port binding issues.
Diagnosis Steps
- 1Used kubectl get svc to check the services' port configurations and found that both services were trying to bind to the same port.
- 2Verified node logs and observed port binding errors.
Root Cause
Missing port range configurations in the service definitions led to port collision.
Fix/Workaround
• Updated the service definitions to specify unique ports or port ranges.
• Redeployed the services to resolve the conflict.Lessons Learned
Always ensure that services use unique port configurations to avoid conflicts.
How to Avoid
- 1Define port ranges explicitly in service configurations.
- 2Use tools like kubectl to validate port allocations before deploying services.