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Scenario #120
Networking
K8s v1.21, AWS EKS
Pod-to-Pod Communication Blocked by Network Policies
Pod-to-pod communication was blocked due to overly restrictive network policies.
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What Happened
A network policy was misconfigured, preventing certain pods from communicating with each other despite being within the same namespace.
Diagnosis Steps
- 1Used kubectl get networkpolicy to inspect the network policies in place.
- 2Found that a policy restricted traffic between pods in the same namespace.
- 3Reviewed policy rules and discovered an incorrect egress restriction.
Root Cause
Misconfigured egress rule in the network policy.
Fix/Workaround
• Modified the network policy to allow traffic between the pods.
• Applied the updated policy and verified that communication was restored.Lessons Learned
Ensure network policies are tested thoroughly before being deployed in production.
How to Avoid
- 1Use dry-run functionality when applying network policies.
- 2Continuously test policies in a staging environment before production rollout.