Linkerd is a popular open-source service mesh designed to provide observability, security, and reliability to cloud-native applications. It works by injecting a lightweight proxy, known as the Linkerd proxy, into each pod in your Kubernetes cluster. This proxy intercepts all network traffic to and from the pod, enabling features like automatic retries, load balancing, and detailed telemetry.
One common issue users encounter is the failure of the Linkerd proxy to inject into pods. This can manifest as missing telemetry data, lack of traffic routing, or simply the absence of the proxy container in the pod's specification. This issue can severely impact the functionality of your service mesh.
The primary reason for the Linkerd proxy not being injected is often related to incorrect namespace labeling or issues with the injector webhook. The namespace must be labeled with linkerd.io/inject: enabled for automatic injection to occur. Additionally, the Linkerd injector webhook must be running and properly configured to modify pod specifications as they are created.
Ensure that the namespace where your application is deployed is correctly labeled. You can verify this by running:
kubectl get namespace <your-namespace> --show-labels
If the label linkerd.io/inject: enabled is missing, add it using:
kubectl label namespace <your-namespace> linkerd.io/inject=enabled
Check the status of the Linkerd injector webhook by inspecting the Linkerd control plane:
kubectl get pods -n linkerd
Look for the linkerd-proxy-injector pod and ensure it is running. If not, you may need to troubleshoot the control plane installation.
Ensure that your namespace is labeled correctly. Use the command:
kubectl label namespace <your-namespace> linkerd.io/inject=enabled
Re-deploy your application to trigger the injection process.
Verify that the linkerd-proxy-injector pod is running:
kubectl get pods -n linkerd
If the pod is not running, check the logs for errors:
kubectl logs <injector-pod-name> -n linkerd
Address any issues found in the logs, which may involve re-installing the Linkerd control plane.
For more detailed guidance, refer to the official Linkerd documentation on proxy injection. If you encounter further issues, consider reaching out to the Linkerd community for support.
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