We cannot install heapster to get better stats for our cluster, so we cannot use commands like kubectl top nodes for instance.
Heapster gives the following error:
Error in scraping containers from kubelet_summary:x.x.x.x:10255: Get http://x.x.x.x:10255/stats/summary/: dial tcp x.x.x.x:10255: getsockopt: connection refused
I think the kubelet has to have the --readonly-port=10255 option when starting it on the nodes.
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Related github issue: https://github.com/digitalocean/digitalocean-cloud-controller-manager/issues/150
i got this working by installing metrics-server (https://github.com/kubernetes-sigs/metrics-server) and modified the /metrics-server/deploy/kubernetes/metrics-server-deployment.yaml by adding the following to command to look like this:
command: - /metrics-server - --kubelet-insecure-tls - --secure-port=4443 (port number depends on your case) - --metric-resolution=10s - --kubelet-preferred-address-types=InternalIP
Even tough heapster is deprecated, it’s currently the only metrics service which works with kubernetes-dashboard.
I’ve got it working with a helm installment using the https kubelet port 10250 instead of the readonly http port 10255 - which is deprecated and not available on DO too
helm upgrade --install --wait k8s-heapster stable/heapster --set=command='{/heapster,--source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true}' --namespace kube-system
Or, in yaml:
command:
- /heapster
- --source=kubernetes:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true
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