k8s 1.14部署metrics server显示running但是报ServiceUnavailable错误

查看metrics server日志：
[root@master metrics-server-latest]# kubectl logs -f metrics-server-v0.3.6-b59d6b7cb-9ftdf -nkube-system metrics-server
I0514 03:15:00.325762       1 serving.go:312] Generated self-signed cert (apiserver.local.config/certificates/apiserver.crt, apiserver.local.config/certificates/apiserver.key)
I0514 03:15:04.924172       1 secure_serving.go:116] Serving securely on [::]:443
从日志看没有任何异常，但是执行[root@master ~]# kubectl top nodes时报如下错误，获取不到指标数据
Error from server (ServiceUnavailable): the server is currently unable to handle the request (get pods.metrics.k8s.io)

找了很久的资料也没解决，后来看一github上一个大牛最终解决了。具体链接https://github.com/kubernetes-sigs/metrics-server/issues/157
整个过程的配置文件如下

• metrics-server-deployment.yaml

    hostNetwork: true #增加
    containers:
    - name: metrics-server
      image: k8s.gcr.io/metrics-server-amd64:v0.3.6
      command:
      - /metrics-server
      - --metric-resolution=30s
      - --requestheader-allowed-names=aggregator#增加修改
      # These are needed for GKE, which doesn't support secure communication yet.
      # Remove these lines for non-GKE clusters, and when GKE supports token-based auth.
      #- --kubelet-port=10255#注释
      #- --deprecated-kubelet-completely-insecure=true#注释
      - --kubelet-insecure-tls#增加
      - --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP
      ports:
      - containerPort: 443
        name: https
        protocol: TCP
    - name: metrics-server-nanny
      image: k8s.gcr.io/addon-resizer:1.8.7
      resources:
        limits:
          cpu: 100m
          memory: 300Mi
        requests:
          cpu: 5m
          memory: 50Mi
      env:
        - name: MY_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: MY_POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
      volumeMounts:
      - name: metrics-server-config-volume
        mountPath: /etc/config
      command:
        - /pod_nanny
        - --config-dir=/etc/config
        #- --cpu={{ base_metrics_server_cpu }}#注释
        - --cpu=80m#增加
        - --extra-cpu=0.5m
        #- --storage=5Gi
        #- --memory={{ base_metrics_server_memory }}#注释
        - --memory=100Mi#增加
        #- --extra-memory={{ metrics_server_memory_per_node }}Mi#注释
        - --extra-memory=100Mi#修改
        - --threshold=5
        - --deployment=metrics-server-v0.3.6
        - --container=metrics-server
        - --poll-period=300000
        - --estimator=exponential
        # Specifies the smallest cluster (defined in number of nodes)
        # resources will be scaled to.
        #- --minClusterSize=2#注释

• resource-reader.yaml

  
  apiVersion: rbac.authorization.k8s.io/v1
  kind: ClusterRole
  metadata:
  name: system:metrics-server
  labels:
  kubernetes.io/cluster-service: "true"
  addonmanager.kubernetes.io/mode: Reconcile
  rules:

• apiGroups:
  • ""
    resources:
  • pods
  • nodes
  • nodes/stats#增加
  • namespaces

• 更新kubectl apply -f .后再次查看，正常了

  [root@master manifests]# kubectl top nodes
  NAME      CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
  master    252m         6%     978Mi           12%       
  worker1   49m          1%     1442Mi          54%       
  worker2   47m          1%     1380Mi          51%       
  worker3   46m          1%     1232Mi          46% 

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