I'm currently running a Kubernetes cluster on Vagrant and currently testing the HPA using the metrics-server but my setup can't seem to read the metrics at all.

My setup consists of a single loadbalancer(HAProxy), a single Master Node, and two worker nodes.

So, I've pulled the log from the metrics-server pod using the following command:

kubectl logs -n kube-system metrics-server-85cc4d4cb9-sf8wh

and it shows the followings:

E0122 01:53:26.647172       1 sinkprov.go:135] duplicate pod kube-system/metrics-server-85cc4d4cb9-sf8wh received
E0122 01:54:26.653698       1 sinkprov.go:135] duplicate pod kube-system/metrics-server-85cc4d4cb9-sf8wh received
E0122 01:54:26.653838       1 sinkprov.go:135] duplicate pod kube-system/kube-proxy-dk9v8 received
E0122 01:54:26.653864       1 sinkprov.go:135] duplicate pod kube-system/weave-net-jkrn8 received
E0122 01:55:26.647113       1 sinkprov.go:135] duplicate pod kube-system/kube-proxy-dk9v8 received
E0122 01:55:26.647129       1 sinkprov.go:135] duplicate pod kube-system/weave-net-jkrn8 received
E0122 01:55:26.647133       1 sinkprov.go:135] duplicate pod kube-system/metrics-server-85cc4d4cb9-sf8wh received
E0122 01:56:26.646230       1 sinkprov.go:135] duplicate pod kube-system/weave-net-jkrn8 received
E0122 01:56:26.646245       1 sinkprov.go:135] duplicate pod kube-system/metrics-server-85cc4d4cb9-sf8wh received
E0122 01:56:26.646249       1 sinkprov.go:135] duplicate pod kube-system/kube-proxy-dk9v8 received
E0122 01:57:26.691044       1 sinkprov.go:135] duplicate pod kube-system/kube-proxy-dk9v8 received
E0122 01:57:26.691064       1 sinkprov.go:135] duplicate pod kube-system/metrics-server-85cc4d4cb9-sf8wh received
E0122 01:57:26.691069       1 sinkprov.go:135] duplicate pod kube-system/weave-net-jkrn8 received

I've tried to search for a similar posts on stackoverflow and github, but couldn't find any.

I hope you guys can help me figure this out.

p.s.

I've done the metrics-server argument setup as well adding --kubelet-insecure-tls and more. I'm beginning to think that this is a Hypervisor network issue, or maybe not... I'm too much of a noob to know this at the moment :(

I'm starting to think that this was a CNI plugin problem. I've switched from using weavenet CNI plugin to a calico plugin and problem just went away :/... If any one of you can explain this symptom in a much detailed manner I'd really appreciate it! :)