原因:
因为默认情况下k8s集群只提供了收集数据的模块--kubelet中的cadvisor。它类似于zabbix的agent代理程序,用来收集被监控节点的数据信息。
但是k8s集群却没有提供zabbix-server端,没有监控收集端,这时候我们需要自己安装server镜像。这个文件就是metrice-server程序。
wget https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml -O metrics-server-components.yaml
解决方法:
部署metrice-server 官网yaml文件
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: - 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=4443 - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname - --kubelet-use-node-status-port - --metric-resolution=15s
- --kubelet-insecure-tls #不验证证书有效性,不添加会报错提示无法验证节点证书 image: registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server:v0.6.4 #改成阿里云镜像 imagePullPolicy: IfNotPresent livenessProbe: failureThreshold: 3 httpGet: path: /livez port: https scheme: HTTPS periodSeconds: 10 name: metrics-server ports: - containerPort: 4443 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 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: kube-system version: v1beta1 versionPriority: 100
部署完成后:
[root@reg ~]# kubectl top nodes
error: metrics not available yet
pod 没有部署完成,等一会就好