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Asked: 2024-09-25T17:15:53+05:30 In:

I’m trying to set up the metrics-server on my EKS cluster, but I’m encountering an issue where no metrics are being reported. After following the installation steps, the metrics-server seems to be running, but when I try to retrieve metrics, I get no data. What could be causing this problem, and how can I troubleshoot or resolve the issue to get the metrics to display?

I’ve been diving into setting up the metrics-server on my EKS cluster, but I’ve hit a bit of a wall and am hoping some of you might have suggestions or insights. I followed the installation steps from the Kubernetes documentation pretty closely, and I can see that the metrics-server pod is up and running just fine. However, when I try to fetch the metrics using `kubectl top pods` or `kubectl top nodes`, I’m met with silence—no data returned at all.

I feel like I’m missing something obvious. I double-checked the logs of the metrics-server pod, and there aren’t any glaring error messages. The weird part is that the pod itself seems healthy, but the fact that metrics aren’t being reported is baffling. I did notice that my cluster was set up with the default IAM roles, so I’m wondering if there are any permission issues preventing metrics from being collected.

Another thing I considered is the Kubernetes version compatibility. I’m running a relatively recent version of EKS, but could there be any known conflicts with the specific metrics-server version I installed? I went with the latest stable release, thinking that would be fine, but I haven’t seen any updates or notes in the release notes about incompatibilities.

Moreover, I’ve heard that certain configurations in the API server can affect the metrics-server’s ability to gather data. Should I be checking any specific flags or settings in my cluster? Is there anything else in the cluster setup that could potentially block the metrics-server from working properly?

I’m really stuck here, and any advice or ideas would be super helpful. Have you encountered similar issues, or do you have any troubleshooting steps that I might have overlooked? I appreciate any thoughts you have—I just want to get this metrics-server up and running to help monitor my workloads more effectively!

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    2 Answers



    1. Help with Metrics Server on EKS

      Need Help with Metrics Server on EKS

      I’m having a tough time getting the metrics-server to work on my EKS cluster. I followed all the installation instructions from the Kubernetes docs, and the metrics-server pod looks fine—it’s running and healthy. But when I try to run kubectl top pods or kubectl top nodes, nothing comes back. It’s just silence, no metrics at all!

      I checked the logs for the metrics-server pod, and there aren’t any error messages, so that seems good. But why no metrics? I did set up my cluster using the default IAM roles, and I’m starting to wonder if there’s a permissions issue that’s stopping metrics from being collected.

      Also, I think I’m using a pretty recent version of EKS. Could there be compatibility issues with the metrics-server version I installed? I picked the latest stable release, assuming it would be safe, but I haven’t seen anything in the release notes about possible conflicts.

      I’ve also heard some things about how certain settings in the API server can affect metrics-server. Are there specific flags or configurations I should be looking at?

      Basically, I’m pretty stuck and could really use some troubleshooting tips or ideas. Have you guys run into similar issues? Any thoughts on what I might have missed? I’m just eager to get this metrics-server up and running so I can keep an eye on my workloads!


    2. It seems like you’ve done a commendable job of following the installation steps for the metrics-server on your EKS cluster. If the metrics-server pod is healthy but `kubectl top pods` or `kubectl top nodes` returns no data, it’s possible that there might be some configuration issues either in your cluster setup or in the permissions granted to the metrics-server. Since you mentioned that your cluster is set up with the default IAM roles, it would be beneficial to verify that the service account used by the metrics-server has the appropriate permissions to access the resource metrics. Specifically, check if it has the necessary cluster role bindings, such as `system:metrics-server`, which allows the metrics-server to read resource metrics from the API server. Furthermore, ensure that you have the Cluster Autoscaler properly configured if you’re using one, as this may also affect the availability of metrics.

      In addition to reviewing permissions, consider the compatibility between the metrics-server version and your Kubernetes version. While you mentioned you’re using a recent EKS version and the latest stable release of the metrics-server, it’s always worth consulting the documentation for both components to identify any known issues or required configurations. Pay particular attention to any launch flags configured in the Metrics Server deployment—flags like `–kubelet-insecure-tls` or `–kubelet-preferred-address-types` can impact its ability to fetch metrics if they’ve been set incorrectly. Lastly, confirm that the relevant API server settings allow metrics gathering by checking for flags like `–enable-aggregator-routing`. Addressing these areas should hopefully bring the metrics-server back to life and provide you with the metrics you need for monitoring your workloads.

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