Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

master $ kubectl top pod -n kube-system
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

问题分析：

Heapster是容器集群监控和性能分析工具，HPA、Dashborad、Kubectl top都依赖于heapster收集的数据。
但是Heapster从kubernetes 1.8以后已经被遗弃了… 被metrics-server所替代…那么就部署一下Heapster吧

解决办法：

1. vim heapster.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: heapster
  namespace: kube-system

---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: heapster
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:heapster
subjects:
- kind: ServiceAccount
  name: heapster
  namespace: kube-system

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: heapster
  namespace: kube-system
spec:
  replicas: 1
  selector:
      matchLabels:
        k8s-app: heapster
  template:
    metadata:
      labels:
        task: monitoring
        k8s-app: heapster
    spec:
      serviceAccountName: heapster
      containers:
      - name: heapster
        # image: k8s.gcr.io/heapster-amd64:v1.5.4 将默认google的官方镜像替换为阿里云镜像，否则你懂得
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/heapster-amd64:v1.5.4
        command:
        - /heapster
        - --source=kubernetes:https://kubernetes.default?useServiceAccount=true&kubeletHttps=true&kubeletPort=10250&insecure=true
---
apiVersion: v1
kind: Service
metadata:
  labels:
    task: monitoring
    # For use as a Cluster add-on (https://github.com/kubernetes/kubernetes/tree/master/cluster/addons)
    # If you are NOT using this as an add-on, you should comment out this line.
    kubernetes.io/cluster-service: 'true'
    kubernetes.io/name: Heapster
  name: heapster
  namespace: kube-system
spec:
  ports:
  - port: 80
    targetPort: 8082
  selector:
    k8s-app: heapster
 

2.vim heapster-clusterrole.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:heapster
rules:
- apiGroups:
  - ""
  resources:
  - events
  - namespaces
  - nodes
  - pods
  - nodes/stats
  verbs:
  - create
  - get
  - list
  - watch
- apiGroups:
  - extensions
  resources:
  - deployments
  verbs:
  - get
  - list
  - watch
 

3.kubectl apply -f heapster-clusterrole.yaml

4.kubectl apply -f heapster.yaml

5.kubectl top pods -n kube-system