kubernetes 安装metrics-server

metrics-server文件下载：

https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/metrics-server

修改文件：metrics-server-deployment.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: metrics-server
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: metrics-server-config
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: EnsureExists
data:
  NannyConfiguration: |-
    apiVersion: nannyconfig/v1alpha1
    kind: NannyConfiguration
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: metrics-server-v0.2.1
  namespace: kube-system
  labels:
    k8s-app: metrics-server
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    version: v0.2.1
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
      version: v0.2.1
  template:
    metadata:
      name: metrics-server
      labels:
        k8s-app: metrics-server
        version: v0.2.1
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      containers:
      - name: metrics-server
        image: k8s.gcr.io/metrics-server-amd64:v0.2.1    #使用的镜像是v0.2.1
        command:
        - /metrics-server
        - --source=kubernetes.summary_api:https://kubernetes.default?kubeletHttps=true&kubeletPort=10250&insecure=true  #添加这个选项
         #- --metric-resolution=30s
        # 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
        #- --deprecated-kubelet-completely-insecure=true
        ports:
        - containerPort: 443
          name: https
          protocol: TCP
      - name: metrics-server-nanny
        image: k8s.gcr.io/addon-resizer:1.8.2    #使用镜像1.8.2 将1.8.4换成1.8.2
        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=100m                       #需要修改
          - --extra-cpu=0.5m                 #需要修改
          - --memory=40Mi                    #需要修改
          - --extra-memory=4Mi               #需要修改
          - --threshold=5                    
          - --deployment=metrics-server-v0.2.1  #使用v0.2.1的版本  需要将v0.3.1修改为v0.2.1
          - --container=metrics-server 
          - --poll-period=300000
          - --estimator=exponential
          # Specifies the smallest cluster (defined in number of nodes)
          # resources will be scaled to.
        #  - --minClusterSize=6                #需要注释掉
      volumes:
        - name: metrics-server-config-volume
          configMap:
            name: metrics-server-config
      tolerations:
        - key: "CriticalAddonsOnly"
          operator: "Exists"　　

修改文件：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
  - namespaces
  - nodes/stats   #添加次选项
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - "extensions"
  resources:
  - deployments
  verbs:
  - get
  - list
  - update
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:metrics-server
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:metrics-server
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system

　　

测试：

kubectl  get  node

kubectl  get  pod  -n  kube-system

其中出现的问题：

报错：

Error from server (ServiceUnavailable): the server is currently unable to handle the request (get nodes.metrics.k8s.io)

解决方法：

 1. 删除文件  /etc/kubernetes/manifests/kube-apiserver.yaml

 2. 重启kubelet服务

      systemctl  restart  kubelet