When trying to setup a HorizontalPodAutoscaler on Amazon EKS, the TARGETS column always displays <unknown>/50% and when describing the HPA, I see

Warning FailedGetResourceMetric 17s (x50 over 1h) horizontal-pod-autoscaler unable to get metrics for resource cpu: unable to fetch metrics from resource metrics API: the server could not find the requested resource (get pods.metrics.k8s.io)

I've found multiple posts on other sites about similar issues mentioning to use --horizontal-pod-autoscaler-use-rest-clients on the kube-controller-manager, but I cannot find a way to change settings on the kube-controller-manager for an EKS cluster since it appears you can't SSH into the master nodes for management and kube-controller-manager is not listed as a resource anywhere in the system.

I have tried setting up the metrics-server manually following instructions on https://github.com/kubernetes-incubator/metrics-server but in that case, I'm shown that EKS doesn't provide the config map necessary for authenticating API extensions Could not create the API server: configmaps "extension-apiserver-authentication" not found

up vote 8 down vote accepted

This is a known issue currently with EKS. Here is my response from support (Partially omitted):

Unfortunately, the EKS control plane currently has issues with the metrics-server aggregator. The EKS service team are working to these issues to bring metric-server support to the Control Plane.

As soon as this feature gets released, it should be publicly announced in either one of the following links:

I have indicated your interest in this issue and I will advocate for a solution on your behalf.

Hopefully they sort it out soon.

  • Thank you. I absolutely needed this feature and got a similar response from them. I went ahead and spun up a cluster with kops that I can actually work on when issues arise. Hopefully amazon will give some more configuration to this platform in the future. – James Mills Jun 28 at 16:31

It is supported now, it is a little late and requires a new cluster, you cannot trigger the update manually, yet.

https://aws.amazon.com/blogs/opensource/horizontal-pod-autoscaling-eks/

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