Lab 13.3. How to fix metrics-server "no matches for kind "APIService"" error?

Gim6626

Hi!

I'm stuck on lab 13.3, step 3:

[08:32][email protected][metrics-server]$ kubectl create -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
serviceaccount/metrics-server created
deployment.apps/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
error: unable to recognize "https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml": no matches for kind "APIService" in version "apiregistration.k8s.io/v1beta1"

I've seen "Be aware as new versions are released there may be some changes to the process and
the created objects" but could not fix it anyway.

Could anybody help?

serewicz

Hello,

What version of the software are you using? This is what I see when I run the steps with a setup as declared in the lab:

[email protected]:~# cd metrics-server/ ; less README.md
[email protected]:~/metrics-server# kubectl create -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
Warning: apiregistration.k8s.io/v1beta1 APIService is deprecated in v1.19+, unavailable in v1.22+; use apiregistration.k8s.io/v1 APIService
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
serviceaccount/metrics-server created
deployment.apps/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
[email protected]:~/metrics-server#

ahailes

I got the same error and the following seemed to fix it:
1) run kubectl delete -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml to delete the components created by the 0.3.7 file
2) run kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml as suggested in the project README.

The problem seems to be that apiregistration.k8s.io is out of beta, and fully deprecated as of kubernetes version 1.22, as noted in serewicz's output. The version I'm on is 1.22 and I believe that's what the course is expecting us to be on at this point. So it should probably be updated to not tell us to use a components file that won't work with our version.

goosecoder

I agree, it seems the lessons need some updates, in one previous lesson lab we upgraded our instances/nodes to kubernetes 1.22.1, at this point that yaml is expected to be compatible with that k8s version. Thanks for posting the url of the compatible yaml.

serewicz

Hello,

Step 2 of exercise 13.3 mentions the software changes and to reference the current README.md file for updated information.

Step 3 of exercise 13.3 says

"Be aware as new versions are released there may be some changes to the process and
the created objects. Use the components.yaml to create the objects."

Should one read the README and follow the most current directions the labs work. At least as of today they do. With dynamic software there are times when an update or change causes an issue, and one would need to revisit the steps when the new fix is produced.

Regards,

liamwadman

Serewicz that's a completely unacceptable answer. Yes we can google it, read readme's and search around but having to do this a lot for problems in the instructions does not make for a great learning experience.

You should update the instructions for this exercise or others.

cvrupesh

Also use - --enable-aggregator-routing = true in the args, I had the issue resolved after using kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml and adding the above argument

dicalleson

I had this and had to delete the metrics server by running this:

kubectl delete service/metrics-server -n kube-system
kubectl delete deployment.apps/metrics-server -n kube-system
kubectl delete apiservices.apiregistration.k8s.io v1beta1.metrics.k8s.io
kubectl delete clusterroles.rbac.authorization.k8s.io system:aggregated-metrics-reader
kubectl delete clusterroles.rbac.authorization.k8s.io system:metrics-server
kubectl delete clusterrolebinding metrics-server:system:auth-delegator
kubectl delete clusterrolebinding system:metrics-server
kubectl delete rolebinding metrics-server-auth-reader -n kube-system
kubectl delete serviceaccount metrics-server -n kube-system

Then you can use the correct command for your current version of K8s (my version is 1.25.1)... so ie see the README.md at https://github.com/kubernetes-sigs/metrics-server which says in my case to install the "latest" so I run...

kubectl create -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

hope this helps someone...

nicocerquera

I think we should use apply instead of create, go this from stack overflow:

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

and it worked!