Service Mesh Sidecar Injection Failure

Sidecar injection failed for some pods in the service mesh, preventing communication between services.

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What Happened

Newly deployed pods in the service mesh were missing their sidecar proxy containers, causing communication failures.

Diagnosis Steps

1Verified the Istio sidecar injector webhook was properly configured.
2Checked the labels and annotations on the affected pods and found that they were missing the sidecar.istio.io/inject: "true" annotation.

Root Cause

Pods were missing the required annotation for automatic sidecar injection.

Fix/Workaround

• Added the sidecar.istio.io/inject: "true" annotation to the missing pods.
• Redeployed the pods to trigger sidecar injection.

Lessons Learned

Ensure that required annotations are applied to all pods, or configure the sidecar injector to inject by default.

How to Avoid