kubernetes metrics server don't start

Question

I try to connect in the dashboard of kubernetes.

I have the latest version of kubernetes v1.12 with kubeadm , in a server.

I download from github the metrics-server and run:

Kubctl create -f deploy/1.8+

but i get this error

kube-system metrics-server-5cbbc84f8c-tjfxd 0/1 Pending 0 12m

with out log to debug

error: the server doesn't have a resource type "logs"

I don't want to install heapster because is DEPRECATED.

UPDATE

Hello, and thanks.

i run the taint command i get:

error: at least one taint update is required

and the command

kubectl describe deployment metrics-server -n kube-system

i get this output:

Name:                   metrics-server
Namespace:              kube-system
CreationTimestamp:      Thu, 18 Oct 2018 14:34:42 +0000
Labels:                 k8s-app=metrics-server
Annotations:            deployment.kubernetes.io/revision: 1
 kubectl.kubernetes.io/last-applied-configuration:     {"apiVersion":"extensions/v1beta1","kind":"Deployment","metadata":    {"annotations":{},"labels":{"k8s-app":"metrics-server"},"name":"metrics-...
 Selector:               k8s-app=metrics-server
 Replicas:               1 desired | 1 updated | 1 total | 0 available | 1      unavailable
 StrategyType:           RollingUpdate
 MinReadySeconds:        0
 RollingUpdateStrategy:  1 max unavailable, 1 max surge
 Pod Template:
   Labels:           k8s-app=metrics-server
   Service Account:  metrics-server
   Containers:
    metrics-server:
Image:        k8s.gcr.io/metrics-server-amd64:v0.3.1
Port:         <none>
Host Port:    <none>
Environment:  <none>
Mounts:
  /tmp from tmp-dir (rw)
Volumes:
tmp-dir:
Type:    EmptyDir (a temporary directory that shares a pod's lifetime)
Medium:  
 Conditions:
   Type           Status  Reason
   ----           ------  ------
   Available      True    MinimumReplicasAvailable
 OldReplicaSets:  <none>
 NewReplicaSet:   metrics-server-5cbbc84f8c (1/1 replicas created)
 Events:          <none>

Command:

kubectl get nodes

The output for this is just the IP of the node, and nothing special.

Any ideas, or what to do to work the dashboard for kubernetes.

provide output of kubectl describe deployment metrics-server -n kube-system — Vit

Vit Vit · Accepted Answer · 2018-10-18T16:18:27

I suppose you are trying setup metrics-server on your master node.

If you issue kubectl describe deployment metrics-server -n kube-system I believe you will see something like this:

Name: metrics-server Namespace:
kube-system CreationTimestamp: Thu, 18 Oct 2018 15:57:34 +0000 Labels: k8s-app=metrics-server Annotations:
deployment.kubernetes.io/revision: 1 Selector:
k8s-app=metrics-server Replicas: 1 desired | 1 updated | 1 total | 0 available | 1 unavailable

But if you will describe your node you will see taint that prevent you from scheduling new pods on master node:

kubectl get nodes

NAME            STATUS   ROLES    AGE   VERSION
kube-master-1   Ready    master   17m   v1.12.1

kubectl describe node kube-master-1

Name:               kube-master-1
...
Taints:             node-role.kubernetes.io/master:NoSchedule

You have to remove this taint:

kubectl taint node kube-master-1 node-role.kubernetes.io/master:NoSchedule-
node/kube-master-1 untainted

Result:

 kubectl get pods --all-namespaces

NAMESPACE     NAME                                    READY   STATUS    RESTARTS   AGE
kube-system   calico-node-xvc77                       2/2     Running   0          20m
kube-system   coredns-576cbf47c7-rj4wh                1/1     Running   0          21m
kube-system   coredns-576cbf47c7-vsjsf                1/1     Running   0          21m
kube-system   etcd-kube-master-1                      1/1     Running   0          20m
kube-system   kube-apiserver-kube-master-1            1/1     Running   0          20m
kube-system   kube-controller-manager-kube-master-1   1/1     Running   0          20m
kube-system   kube-proxy-xp5zh                        1/1     Running   0          21m
kube-system   kube-scheduler-kube-master-1            1/1     Running   0          20m
kube-system   metrics-server-5cbbc84f8c-l2t76         1/1     Running   0          18m

But this is not the best approach. Good approach is to join worker and set up metrics-server there. There won't be any issues and there is no need to touch taint on master node.

Hope it will help you.

kubernetes metrics server don't start

1 Answers