Kubernetes metrics服务器API

我正在dev环境中运行一个Kuberentes集群。我为metrics服务器执行了部署文件，我的pod已启动并运行，没有任何错误消息。请参见此处的输出：

root@master:~/pre-release# kubectl get pod -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP           NODE       NOMINATED NODE   READINESS GATES
metrics-server-568697d856-9jshp   1/1     Running   0          10m   10.244.1.5   worker-1   <none>           <none>

这里是完整的代码

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: pre-release
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
    rbac.authorization.k8s.io/aggregate-to-admin: "true"
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
    rbac.authorization.k8s.io/aggregate-to-view: "true"
  name: system:aggregated-metrics-reader
rules:
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  - nodes/stats
  - namespaces
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server-auth-reader
  namespace: pre-release
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: pre-release
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server:system:auth-delegator
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: pre-release
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:metrics-server
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: pre-release
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: pre-release
spec:
  ports:
  - name: https
    port: 443
    protocol: TCP
    targetPort: https
  selector:
    k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: pre-release
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      containers:
      - args:
        - --cert-dir=/tmp
        - --secure-port=443
        - --kubelet-preferred-address-types=InternalIP
        - --kubelet-insecure-tls
        - --kubelet-use-node-status-port
        image: k8s.gcr.io/metrics-server/metrics-server:v0.4.2
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
           httpGet:
            path: /livez
            port: https
            scheme: HTTPS
          periodSeconds: 10
        name: metrics-server
        ports:
        - containerPort: 443
          name: https
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /readyz
            port: https
            scheme: HTTPS
          periodSeconds: 10
        securityContext:
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
        volumeMounts:
        - mountPath: /tmp
          name: tmp-dir
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      volumes:
       - emptyDir: {}
        name: tmp-dir
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  labels:
    k8s-app: metrics-server
  name: v1beta1.metrics.k8s.io
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: metrics-server
    namespace: pre-release
  version: v1beta1
  versionPriority: 100

最新错误

I0330 09:02:31.705767       1 secure_serving.go:116] Serving securely on [::]:4443

E0330 09:04:01.718135       1 manager.go:111] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:worker-2: unable to fetch metrics from Kubelet worker-2 (worker-2): Get https://worker-2:10250/stats/summary?only_cpu_and_memory=true: dial tcp: lookup worker-2 on 10.96.0.10:53: no such host, unable to fully scrape metrics from source kubelet_summary:master: unable to fetch metrics from Kubelet master (master): Get https://master:10250/stats/summary?only_cpu_and_memory=true: dial tcp: lookup master on 10.96.0.10:53: read udp 10.244.2.23:41419->10.96.0.10:53: i/o timeout, unable to fully scrape metrics from source kubelet_summary:worker-1: unable to fetch metrics from Kubelet worker-1 (worker-1): Get https://worker-1:10250/stats/summary?only_cpu_and_memory=true: dial tcp: i/o timeout]

---

有人能帮我解决这个问题吗。

在我们的开发集群中，以下容器参数适合我

containers:
- args:
  - /metrics-server
  - --cert-dir=/tmp
  - --secure-port=443
  - --kubelet-preferred-address-types=InternalIP
  - --kubelet-insecure-tls

kubectl描述apiservice v1beta1.metrics.k8s.io的结果：

Status:
  Conditions:
    Last Transition Time:  2021-03-29T19:19:20Z
    Message:               all checks passed
    Reason:                Passed
    Status:                True
    Type:                  Available

---

试试看。

正如我在评论部分提到的，可以通过向metrics服务器部署中添加

hostNetwork:true

来解决这一问题

根据kubernetes的说法：

HostNetwork—控制pod是否可以使用节点网络命名空间。这样做可以让pod访问环回设备、监听本地主机的服务，并可以用来窥探同一节点上其他pod的网络活动

spec:
hostNetwork:true您可以共享用于部署metrics服务器的完整部署配置吗？嗨，Rock，我已经添加了完整的代码，请您帮助我。嗨@Gowmi，您可以尝试将hostNetwork添加到您的metrics服务器部署中，并检查它是否正常工作吗？有一个关于如何做到这一点的问题。抱歉，Rock，我仍然遇到同样的问题，你使用的是哪个度量服务器版本，无论你在部署中使用的是什么映像，但我仍然面临同样的问题，我使用了network caligo和Flannel。你能稍微描述一下你的环境吗？
containers:
- args:
  - /metrics-server
  - --cert-dir=/tmp
  - --secure-port=443
  - --kubelet-preferred-address-types=InternalIP
  - --kubelet-insecure-tls

Status:
  Conditions:
    Last Transition Time:  2021-03-29T19:19:20Z
    Message:               all checks passed
    Reason:                Passed
    Status:                True
    Type:                  Available

spec:
  hostNetwork: true   <--- 
  containers:
  - args:
    - /metrics-server
    - --cert-dir=/tmp
    - --secure-port=4443
    - --kubelet-preferred-address-types=InternalIP
    - --kubelet-use-node-status-port
    - --kubelet-insecure-tls