二十 HeapSter 监控（废弃中）
kubectl top 是 k8s 内置查看 POD 监控信息的命令，它是从 HeapSter 中取得数据，而 HeapSter 是运行在 K8S 集群级别的监控软件。
kubectl 有一个内置插件，叫 cAdvisor 它用来收集 node 节点和节点上的 POD 上的资源使用量，HeapSter 可以收集 cAdvisor 在每个节点上采集的数据，这些数据想要持续存储，那么就必须将数据放在 influx DB 的数据库中，然后可以使用 Grafana 配置 influx DB 为数据源，然后展示。
https://github.com/kubernetes-retired/heapster
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20.1 安装 influx DB
influx DB 是一个时序数据库，它需要一个持久存储来保存数据，所以要注意的是在它的清单文件中应该将官方默认的 emptyDir 修改为具有持久存储能力的存储卷。
apiVersion: apps/v1 # 此处修改为 apps/v1，由于修改了此处所以还需要修改标签选择器kind: Deploymentmetadata: name: monitoring-influxdb namespace: kube-systemspec: replicas: 1 selector: # 添加标签 matchLables: # 添加标签 task: monitoring # 添加标签 k8s-app: influxdb # 添加标签 template: metadata: labels: task: monitoring k8s-app: influxdb spec: containers: - name: influxdb image: k8s.gcr.io/heapster-influxdb-amd64:v1.5.2 volumeMounts: - mountPath: /data name: influxdb-storage volumes: - name: influxdb-storage emptyDir: {} # 此处应该修改为具有持久存储能力的---apiVersion: v1kind: Servicemetadata: 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 addon, you should comment out this line. kubernetes.io/cluster-service: 'true' kubernetes.io/name: monitoring-influxdb name: monitoring-influxdb namespace: kube-systemspec: ports: - port: 8086 targetPort: 8086 selector: k8s-app: influxdb
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$ kubectl get svc -n kube-systemNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEkube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 9dkubernetes-dashboard NodePort 10.109.5.194 <none> 443:30894/TCP 3d14hmonitoring-influxdb ClusterIP 10.104.173.236 <none> 8086/TCP 18s
$ kubectl get pod -n kube-systemNAME READY STATUS RESTARTS AGE.....monitoring-influxdb-866db5f944-d7rkd 1/1 Running 0 69s
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20.2 安装 HeapSter
kind: ClusterRoleBindingapiVersion: rbac.authorization.k8s.io/v1beta1metadata: name: heapsterroleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:heapstersubjects:- kind: ServiceAccount name: heapster namespace: kube-system
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apiVersion: v1kind: ServiceAccountmetadata: name: heapster namespace: kube-system---apiVersion: apps/v1 # 修改此处的为 apps/v1，修改此处以后还需要添加 selector kind: Deploymentmetadata: name: heapster namespace: kube-systemspec: replicas: 1 selector: # 因为修改 api 版本所以需要添加 matchLabels: # 添加 task: monitoring # 添加 k8s-app: heapster # 添加 template: metadata: labels: task: monitoring k8s-app: heapster spec: serviceAccountName: heapster containers: - name: heapster image: k8s.gcr.io/heapster-amd64:v1.5.4 imagePullPolicy: IfNotPresent command: - /heapster - --source=kubernetes:https://kubernetes.default - --sink=influxdb:http://monitoring-influxdb.kube-system.svc:8086---apiVersion: v1kind: Servicemetadata: labels: task: monitoring kubernetes.io/cluster-service: 'true' kubernetes.io/name: Heapster name: heapster namespace: kube-systemspec: ports: - port: 80 targetPort: 8082 selector: k8s-app: heapster
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NAME READY STATUS RESTARTS AGE...heapster-5d4bf58946-6dmgf 1/1 Running 0 113smonitoring-influxdb-866db5f944-d7rkd 1/1 Running 0 23m
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20.3 安装 Grafana
apiVersion: apps/v1 # 修改此处为 apps/v1kind: Deploymentmetadata: name: monitoring-grafana namespace: kube-systemspec: replicas: 1 selector: # 由于修改了 api 版本，所以增加此处 matchLabels: # 标签选择器 task: monitoring # 标签选择器 k8s-app: grafana # 标签选择器 template: metadata: labels: task: monitoring k8s-app: grafana spec: containers: - name: grafana image: k8s.gcr.io/heapster-grafana-amd64:v5.0.4 ports: - containerPort: 3000 protocol: TCP volumeMounts: - mountPath: /etc/ssl/certs name: ca-certificates readOnly: true - mountPath: /var name: grafana-storage env: - name: INFLUXDB_HOST value: monitoring-influxdb - name: GF_SERVER_HTTP_PORT value: "3000" - name: GF_AUTH_BASIC_ENABLED value: "false" - name: GF_AUTH_ANONYMOUS_ENABLED value: "true" - name: GF_AUTH_ANONYMOUS_ORG_ROLE value: Admin - name: GF_SERVER_ROOT_URL value: / volumes: - name: ca-certificates hostPath: path: /etc/ssl/certs # 注意配置 ssl 证书 - name: grafana-storage emptyDir: {} # 注意配置持久存储---apiVersion: v1kind: Servicemetadata: labels: kubernetes.io/cluster-service: 'true' kubernetes.io/name: monitoring-grafana name: monitoring-grafana namespace: kube-systemspec: type: NodePort # 如果需要通过外部访问可以打开，可以关闭 heapster 的此项 ports: - port: 80 targetPort: 3000 selector: k8s-app: grafana
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其他
自己将手记发在：https://github.com/redhatxl/awesome-kubernetes-notes欢迎一键三连
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