Скачать или смотреть Troubleshooting no Route matched with those values Using Kong Ingress Controller

Learn how to solve the error "no Route matched with those values" when connecting to your Jupyter Lab container via Kong ingress controller in Kubernetes.
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This video is based on the question https://stackoverflow.com/q/63273727/ asked by the user 'jpjenk' ( https://stackoverflow.com/u/7245548/ ) and on the answer https://stackoverflow.com/a/63282380/ provided by the user 'mario' ( https://stackoverflow.com/u/11714114/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the "no Route matched with those values" Error with Kong Ingress Controller

If you're working with the Kong ingress controller and are trying to connect to a Jupyter Lab container on Kubernetes, you might encounter the frustrating error message: "no Route matched with those values." This issue can prevent you from accessing your applications, leaving you stuck and searching for answers. In this guide, we will explore the root cause of this error and provide a step-by-step solution to resolve it.

Understanding the Problem

When you attempt to access a service running in your Kubernetes cluster via the Kong ingress controller, you may see the error message alongside logs that indicate no active endpoints for the specified service. Specifically, you might see entries like:

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This error generally implies that the ingress controller cannot route requests to the desired service due to a misconfiguration. In our case, it concerns the service named rjup2, which is associated with our Jupyter Lab deployment.

Analyzing the Deployment and Service Configuration

To better understand why this error occurs, let’s take a look at the relevant parts of our Kubernetes configurations:

Deployment Configuration

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This configuration defines a pod that runs the Jupyter Lab application. Here, the pod is labeled with run: rjup2, which is important for correctly linking it to the service.

Service Configuration

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The service is supposed to expose the pods running the application, but there's a mismatch in the selector. The service is set to look for pods labeled with app: rjup2, but the pods are actually labeled with run: rjup2. This inconsistency is the root cause of the problem, preventing the service from discovering the correct endpoints.

The Solution: Fixing the Service Selector

To resolve the problem, you need to update the selector in your service configuration to ensure it matches the pod labels properly.

Updated Service Configuration

The corrected service configuration should look like this:

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By changing the selector to run: rjup2, the service will successfully select the matching pods, thus creating active endpoints for Kong to route your requests to.

Verifying Your Changes

After updating your service configuration, apply the changes and check if the endpoints are now active. You can verify this with the command:

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You should see the Endpoints object with the corresponding pod(s). If everything is configured correctly, you should be able to access your Jupyter Lab application without hitting any routing errors.

Conclusion

By ensuring that your service selector matches the labels of the pods it should expose, you can resolve the common "no Route matched with those values" error when working with the Kong ingress controller in Kubernetes. This simple adjustment could save you a lot of time and frustration when deploying applications in a cloud-managed Kubernetes service.

If you experience further issues, double-check all configurations and consult the Kubernetes and Kong documentation for additional troubleshooting resources. Happy coding!