一、Metrics-Server 介绍

Metrics-Server是k8s集群采集监控数据的聚合器，如采集node、pod的cpu、内存等数据，从 Kubernetes1.8 开始默认使用Metrics-Server采集数据，并通过Metrics API的形式提供查询，但是，kubeadm安装的k8s集群默认是没有安装Metrics-Server的。

⚠️ 注意：

在 Kubernetes 1.7 版本引入了聚合层，允许第三方应用程序通过将自己注册到kube-apiserver上，仍然通过 API Server 的 HTTP URL 对新的 API 进行访问和操作。为了实现这个机制，Kubernetes 在 kube-apiserver 服务中引入了一个API 聚合层（API Aggregation Layer），用于将扩展 API 的访问请求转发到用户服务的功能。如果你是kubadm 的部署方式，默认已开启Kubernetes API聚合层。

Metrics Server项目地址： https://github.com/kubernetes-sigs/metrics-server
metrics-server版本与k8s版本对应关系: https://github.com/kubernetes-sigs/metrics-server#compatibility-matrix
本次部署环境： K8S1.32 ，Metrics Server 0.8.0

二、部署Metrics-Server

下载 Metrics Server 的部署文件:

$ wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.8.0/components.yaml

修改components.yaml 文件:

国内墙，需要替换 registry.k8s.io/metrics-server/metrics-server:v0.8.0 镜像地址为：registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.8.0

apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
---
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:
  - nodes/metrics
  verbs:
  - get
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server-auth-reader
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
  name: metrics-server
  namespace: kube-system
---
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: kube-system
---
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: kube-system
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  ports:
  - appProtocol: https
    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: kube-system
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=10250
        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
        - --kubelet-use-node-status-port
        - --metric-resolution=15s
        - --kubelet-insecure-tls
        #image: registry.k8s.io/metrics-server/metrics-server:v0.8.0
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.8.0
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /livez
            port: https
            scheme: HTTPS
          periodSeconds: 10
        name: metrics-server
        ports:
        - containerPort: 10250
          name: https
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /readyz
            port: https
            scheme: HTTPS
          initialDelaySeconds: 20
          periodSeconds: 10
        resources:
          requests:
            cpu: 100m
            memory: 200Mi
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - ALL
          readOnlyRootFilesystem: true
          runAsNonRoot: true
          runAsUser: 1000
          seccompProfile:
            type: RuntimeDefault
        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: kube-system
  version: v1beta1
  versionPriority: 100

部署 Metrics Server :
```
$ kubectl apply -f components.yaml
```

验证 Metrics Server 是否成功部署:

$ kubectl get pods -n kube-system -l k8s-app=metrics-server
NAME                             READY   STATUS    RESTARTS   AGE
metrics-server-74458669b-wvkkr   1/1     Running   0          130m

使用 kubectl top 命令查看 Pods 和 Nodes 的资源使用情况：

$ kubectl top pods
NAME                            CPU(cores)   MEMORY(bytes)   
pig-auth-58f7855c76-cft8m       3m           523Mi           
pig-codegen-7799896dd6-mzfhx    3m           633Mi           
pig-gateway-65854c6b5c-l7rdc    2m           425Mi           
pig-gateway-65854c6b5c-t64c9    2m           451Mi           
pig-monitor-5b5c68bc4f-kt5hn    11m          457Mi           
pig-mysql-c867c676f-6zs9z       7m           439Mi           
pig-quartz-657d5c9f77-qx6q5     19m          509Mi           
pig-quartz-657d5c9f77-sbszt     5m           484Mi           
pig-redis-6dbccc7854-f786j      2m           8Mi             
pig-register-798bc58678-rqrrn   7m           647Mi           
pig-ui-5ff9bbdd7f-ld7mb         0m           3Mi             
pig-upms-d9dcc697f-7cdhw        17m          575Mi           
pig-upms-d9dcc697f-klx6z        17m          492Mi  


$ kubectl top nodes
NAME           CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
k8s-master01   230m         5%     3026Mi          41%       
k8s-master02   240m         6%     2399Mi          32%       
k8s-master03   214m         5%     2221Mi          30%       
k8s-node01     264m         6%     6663Mi          90%

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K8S部署Metrics-Server服务

admin • January 26, 2026 • Read: 151 • 编码👨🏻‍💻

一、Metrics-Server 介绍

二、部署Metrics-Server