Prometheus 之 Kubernetes节点的监控

一、方法分析

  • 每个节点都需要监控,因此可以使用DaemonSet类型来管理node_exporter
  • 添加节点的容忍配置(因当前master节点设置了污点)
  • 挂载宿主机中的系统文件信息(用以获取每个节点的主机的系统信息)

二、pod的yaml文件

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: monitor
  labels:
    app: node-exporter
spec:
  selector:
    matchLabels:
      app: node-exporter
  template:
    metadata:
      labels:
        app: node-exporter
    spec:
      hostPID: true
      hostIPC: true
      hostNetwork: true
      nodeSelector:
        kubernetes.io/os: linux
      containers:
      - name: node-exporter
        image: prom/node-exporter:v1.0.1
        args:
        - --web.listen-address=$(HOSTIP):9100
        - --path.procfs=/host/proc
        - --path.sysfs=/host/sys
        - --path.rootfs=/host/root
        - --collector.filesystem.ignored-mount-points=^/(dev|proc|sys|var/lib/docker/.+)($|/)
        - --collector.filesystem.ignored-fs-types=^(autofs|binfmt_misc|cgroup|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|mqueue|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|sysfs|tracefs)$
        ports:
        - containerPort: 9100             #对外暴露接口
        env:
        - name: HOSTIP
          valueFrom:
            fieldRef:
              fieldPath: status.hostIP
        resources:
          requests:
            cpu: 150m
            memory: 180Mi
          limits:
            cpu: 150m
            memory: 180Mi
        securityContext:
          runAsNonRoot: true
          runAsUser: 65534
        volumeMounts:
        - name: proc
          mountPath: /host/proc
        - name: sys
          mountPath: /host/sys
        - name: root
          mountPath: /host/root
          mountPropagation: HostToContainer
          readOnly: true
      tolerations:
      - operator: "Exists"       #设置亏点
      volumes:
      - name: proc
        hostPath:
          path: /proc
      - name: dev
        hostPath:
          path: /dev
      - name: sys
        hostPath:
          path: /sys
      - name: root
        hostPath:
          path: /

Prometheus  之  Kubernetes节点的监控

三、关于如何把各节点的监控数据对接到Prometheus

方法一:把每个node-exporter的服务以静态配置的方法添加到target列表中,如:

    - job_name: 'k8s-slave1'
      static_configs:
      - targets: ['10.3.153.201:9100']

Prometheus  之  Kubernetes节点的监控

以上方法带来的问题:

* 集群节点的增删,都需要手动维护列表
* target列表维护量随着集群规模增加

方法二:配置一个Service,后端挂载node-exporter的服务,把Service的地址配置到target中,如:

带来新的问题,target中无法直观的看到各节点node-exporter的状态

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转载自blog.51cto.com/12965094/2679472