error kubernetes metricserver

-
#show error
[root@k8s-master kubernetes]# kubectl get pods -n kube-system
NAME                                 READY   STATUS             RESTARTS   AGE
coredns-66bff467f8-glbj5             1/1     Running            0          15d
coredns-66bff467f8-s9zp2             1/1     Running            0          15d
etcd-k8s-master                      1/1     Running            0          15d
kube-apiserver-k8s-master            1/1     Running            0          15d
kube-controller-manager-k8s-master   1/1     Running            0          15d
kube-proxy-s7kws                     1/1     Running            0          15d
kube-proxy-wd7dj                     1/1     Running            0          15d
kube-scheduler-k8s-master            1/1     Running            0          15d
metrics-server-84cf4ddd7f-crd8w      0/1     ImagePullBackOff   0          59m
metrics-server-fb5cb87fd-mdx9m       0/1     CrashLoopBackOff   3997       14d

#fix error
[root@k8s-master kubernetes]# wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml
#apply metricserver.yaml
[root@k8s-master kubernetes]# kubectl apply -f ./components.yaml
#show pods
[root@k8s-master kubernetes]# kubectl get pods --all-namespaces
NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE
default       gtomcat                              1/1     Running   0          13d
default       nginx-f89759699-5vtq5                1/1     Running   0          15d
kube-system   coredns-66bff467f8-glbj5             1/1     Running   0          15d
kube-system   coredns-66bff467f8-s9zp2             1/1     Running   0          15d
kube-system   etcd-k8s-master                      1/1     Running   0          15d
kube-system   kube-apiserver-k8s-master            1/1     Running   0          15d
kube-system   kube-controller-manager-k8s-master   1/1     Running   0          15d
kube-system   kube-proxy-s7kws                     1/1     Running   0          15d
kube-system   kube-proxy-wd7dj                     1/1     Running   0          15d
kube-system   kube-scheduler-k8s-master            1/1     Running   0          15d
kube-system   metrics-server-585dbd8b6c-cb9mp      1/1     Running   0          58s

#whoe error 
[root@k8s-master kubernetes]# kubectl get --raw "/apis/metrics.k8s.io/v1beta1/pods"
Error from server (NotFound): the server could not find the requested resource
[root@k8s-master kubernetes]# kubectl get --raw "/apis/metrics.k8s.io/v1beta1/pods"
Error from server (ServiceUnavailable): the server is currently unable to handle the request
[root@k8s-master kubernetes]# kubectl get --raw "/apis/metrics.k8s.io/v1beta1/pods"
{"kind":"PodMetricsList","apiVersion":"metrics.k8s.io/v1beta1","metadata":{"selfLink":"/apis/metrics.k8s.io/v1beta1/pods"},"items":[]}
[root@k8s-master kubernetes]# kubectl top po
W0420 19:09:25.764825   79210 top_pod.go:274] Metrics not available for pod default/gtomcat, age: 319h29m55.764793785s
error: Metrics not available for pod default/gtomcat, age: 319h29m55.764793785s
[root@k8s-master kubernetes]# kubectl get pods -n kube-system -o wide
NAME                                 READY   STATUS    RESTARTS   AGE   IP              NODE         NOMINATED NODE   READINESS GATES
coredns-66bff467f8-glbj5             1/1     Running   0          15d   10.244.0.3      k8s-master   <none>           <none>
coredns-66bff467f8-s9zp2             1/1     Running   0          15d   10.244.0.2      k8s-master   <none>           <none>
etcd-k8s-master                      1/1     Running   0          15d   192.168.0.162   k8s-master   <none>           <none>
kube-apiserver-k8s-master            1/1     Running   0          15d   192.168.0.162   k8s-master   <none>           <none>
kube-controller-manager-k8s-master   1/1     Running   0          15d   192.168.0.162   k8s-master   <none>           <none>
kube-proxy-s7kws                     1/1     Running   0          15d   192.168.0.139   k8s-node1    <none>           <none>
kube-proxy-wd7dj                     1/1     Running   0          15d   192.168.0.162   k8s-master   <none>           <none>
kube-scheduler-k8s-master            1/1     Running   0          15d   192.168.0.162   k8s-master   <none>           <none>
metrics-server-67c75d59f8-7dsrv      1/1     Running   0          18s   192.168.0.139   k8s-node1    <none>           <none>
[root@k8s-master kubernetes]#

#show pods
I0420 10:09:19.170457       1 serving.go:312] Generated self-signed cert (/tmp/apiserver.crt, /tmp/apiserver.key)
I0420 10:09:21.582240       1 secure_serving.go:116] Serving securely on [::]:4443
E0420 10:09:22.075518       1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/kube-proxy-wd7dj: no metrics known for pod
E0420 10:09:22.075573       1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/kube-proxy-s7kws: no metrics known for pod
E0420 10:09:22.075585       1 reststorage.go:160] unable to fetch pod metrics for pod kube-system/kube-apiserver-k8s-master: no metrics known for pod
E0420 10:09:22.075595       1 reststorage.go:160] unable to fetch pod metrics for pod default/nginx-f89759699-5vtq5: no metrics known for pod

#fix metricserver.yaml
[root@k8s-master kubernetes]# vi components.yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: metrics-server
  namespace: kube-system
  labels:
    k8s-app: metrics-server
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  template:
    metadata:
      name: metrics-server
      labels:
        k8s-app: metrics-server
    spec:
      hostNetwork: true
      serviceAccountName: metrics-server
      volumes:
      # mount in tmp so we can safely use from-scratch images and/or read-only containers
      - name: tmp-dir
        emptyDir: {}
      containers:
      - name: metrics-server
        image: k8s.gcr.io/metrics-server-amd64:v0.3.6
        imagePullPolicy: IfNotPresent
        args:
          - --cert-dir=/tmp
          - --kubelet-preferred-address-types=InternalIP
          - --kubelet-insecure-tls
          - --secure-port=4443
        ports:
        - name: main-port
          containerPort: 4443
          protocol: TCP
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
        volumeMounts:
        - name: tmp-dir
          mountPath: /tmp

#test metricserver
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   0%/50%    1         10        1          6h9m
[root@k8s-master metricbeat]#
[root@k8s-master metricbeat]#
[root@k8s-master metricbeat]#
[root@k8s-master metricbeat]#
[root@k8s-master metricbeat]# kubectl run --generator=run-pod/v1 -it --rm load-generator --image=busybox /bin/sh
Flag --generator has been deprecated, has no effect and will be removed in the future.
If you don't see a command prompt, try pressing enter.
/ # while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done
OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OKK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OOK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!OK!^C
/ # Session ended, resume using 'kubectl attach load-generator -c load-generator -i -t' command when the pod is running
pod "load-generator" deleted
[root@k8s-master metricbeat]#
[root@k8s-master metricbeat]# export KUBECONFIG=/etc/kubernetes/admin.conf
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   0%/50%    1         10        1          6h10m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   0%/50%    1         10        1          6h10m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS    MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   237%/50%   1         10        4          6h10m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   67%/50%   1         10        5          6h11m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   67%/50%   1         10        5          6h12m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   67%/50%   1         10        5          6h12m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   67%/50%   1         10        5          6h12m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   0%/50%    1         10        1          6h22m
[root@k8s-master metricbeat]# kubectl  get pods  --all-namespaces
NAMESPACE     NAME                                 READY   STATUS    RESTARTS   AGE
default       gtomcat                              1/1     Running   0          13d
default       load-generator                       1/1     Running   0          31m
default       nginx-f89759699-5vtq5                1/1     Running   0          15d
default       php-apache-5c4f475bf5-6ch8v          1/1     Running   0          6h41m
kube-system   coredns-66bff467f8-glbj5             1/1     Running   0          16d
kube-system   coredns-66bff467f8-s9zp2             1/1     Running   0          16d
kube-system   etcd-k8s-master                      1/1     Running   0          16d
kube-system   kube-apiserver-k8s-master            1/1     Running   0          16d
kube-system   kube-controller-manager-k8s-master   1/1     Running   0          16d
kube-system   kube-proxy-s7kws                     1/1     Running   0          16d
kube-system   kube-proxy-wd7dj                     1/1     Running   0          16d
kube-system   kube-scheduler-k8s-master            1/1     Running   0          16d
kube-system   metricbeat-759cc94485-4p2zs          1/1     Running   0          63m
kube-system   metricbeat-8wdvl                     1/1     Running   0          63m
kube-system   metrics-server-67c75d59f8-7dsrv      1/1     Running   0          4h42m
[root@k8s-master metricbeat]# kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
php-apache   Deployment/php-apache   0%/50%    1         10        1          7h17m
[root@k8s-master metricbeat]#

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