### **Metrics-Server** Metrics server定时从Kubelet的Summary API(类似/ap1/v1/nodes/nodename/stats/summary)采集指标信息，这些聚合过的数据将存储在内存中，且以metric-api的形式暴露出去。 metric-server是从api-server中获取cpu、内存使用率这种监控指标kubectl top，并把他们发送给存储后端，如influxdb或云厂商，他当前的核心作用是：**为HPA等组件提供决策指标支持。** **官方地址：**https://github.com/kubernetes-incubator/metrics-server **部署metrics-server** [https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/metrics-server](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/metrics-server)整合进了k8s中的，通过验证的 版本k8s,1.15.0,metrics0.3.3 修改下载后的清单 ``` resource-reader.yaml rules: - apiGroups: - "" resources: - pods - nodes - nodes/stats #新增这一行 - namespaces verbs: - get - list - watch #################################################### metrics-server-deployment.yaml containers metrics-server 启动参数，修改好的如下： containers: - name: metrics-server image: k8s.gcr.io/metrics-server-amd64:v0.3.3 command: - /metrics-server - --metric-resolution=30s - --kubelet-insecure-tls - --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP # 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 ---- # 修改containers，metrics-server-nanny 启动参数，修改好的如下： command: - /pod_nanny - --config-dir=/etc/config - --cpu=80m - --extra-cpu=0.5m - --memory=80Mi - --extra-memory=8Mi - --threshold=5 - --deployment=metrics-server-v0.3.3 - --container=metrics-server - --poll-period=300000 - --estimator=exponential # Specifies the smallest cluster (defined in number of nodes) # resources will be scaled to. #- --minClusterSize={{ metrics_server_min_cluster_size }} ``` 验证 ~~~ kubectl get apiservices ~~~ `kubectl proxy --port=8080` `curl http://localhost:8080/apis/metrics.k8s.io/v1veta1` `curl http://localhost:8080/apis/metrics.k8s.io/v1veta1/nodes` `curl http://localhost:8080/apis/metrics.k8s.io/v1veta1/pods` kubectl top nodes kubect top pods -n kube-system