Kubernetes metrics-server: Error from server (ServiceUnavailable): the server is currently unable to handle the request

Question

executing the command kubectl get --raw /apis/metrics.k8s.io/v1beta1 it returned Error from server (ServiceUnavailable): the server is currently unable to handle the request

view the logs from metrics-server

http: TLS handshake error from 192.168.133.64:51926:EOF

kubelet version is 1.12.3

metrics-server 0.3.1

i have another clusters-set with the same version and configuration, metrics-server works just fine

part of metrics-server-deployment: containers: - name: metrics-server image: k8s.gcr.io/metrics-server-amd64:v0.3.1 imagePullPolicy: Always command: - /metrics-server - --kubelet-insecure-tls volumeMounts: - name: tmp-dir mountPath: /tmp

Answer 1

Looks like it is failing because the hostname resolution happens through the internal DNS system which have pods/service entries but not cluster node entries.

Try running your metrics-server with following arguments:

- command:
  - /metrics-server
  - --kubelet-insecure-tls
  - --kubelet-preferred-address-types=InternalIP

It should work for you as well.

For more info you can look at the following issue here

Hope this helps.

Answer 2

Also worth pointing out that you should make sure metric-server is running

kubectl get pods -n kube-system | grep metrics-server