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Scenario #174
Networking
K8s v1.20, Azure AKS
Pod Network Isolation Due to Misconfigured Network Policy
Pods in a specific namespace were unable to communicate due to an incorrectly applied network policy blocking traffic between namespaces.
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What Happened
A network policy was incorrectly configured to block communication between namespaces, leading to service failures and inability to reach certain pods.
Diagnosis Steps
- 1Used kubectl describe networkpolicy to inspect the policy and confirmed it was overly restrictive.
- 2Tested pod-to-pod communication using kubectl exec and verified the isolation.
Root Cause
The network policy was too restrictive and blocked cross-namespace communication.
Fix/Workaround
• Updated the network policy to allow traffic between namespaces.
• Restarted affected pods to re-establish communication.Lessons Learned
Always test network policies in a staging environment to avoid unintentional isolation.
How to Avoid
- 1Use a staged approach to apply network policies and validate them before enforcing them in production.
- 2Implement automated tests for network policy validation.