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Scenario #157
Networking
K8s v1.19, GKE
Network Traffic Loss Due to Port Collision in Network Policy
Network traffic was lost due to a port collision in the network policy, affecting application availability.
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What Happened
Network traffic was dropped because a network policy inadvertently blocked traffic to a port that was required by another application.
Diagnosis Steps
- 1Inspected the network policy using kubectl describe netpol and identified the port conflict.
- 2Verified traffic flow using kubectl logs to identify blocked traffic.
Root Cause
Misconfigured network policy that blocked traffic to a necessary port due to port collision.
Fix/Workaround
• Updated the network policy to allow the necessary port.
• Applied the updated network policy and tested the traffic flow.Lessons Learned
Thoroughly test network policies to ensure that they do not block critical application traffic.
How to Avoid
- 1Review network policies in detail before applying them in production.
- 2Use automated tools to validate network policies.