Node Exporter¶

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: monitor-sa
  labels:
    name: node-exporter
spec:
  selector:
    matchLabels:
     name: node-exporter
  template:
    metadata:
      labels:
        name: node-exporter
    spec:
      hostPID: true        # Use HOST's PID
      hostIPC: true        # Use HOST's IPC
      hostNetwork: true    # Use HOST's network
      containers:
      - name: node-exporter
        image: quay.io/prometheus/node-exporter:v1.8.2
        ports:
        - containerPort: 9100
        resources:
          requests:
            cpu: 0.15
        securityContext:
          privileged: true
        args:
        - --path.procfs
        - /host/proc
        - --path.sysfs
        - /host/sys
        - --collector.filesystem.ignored-mount-points
        - '"^/(sys|proc|dev|host|etc)($|/)"'
        volumeMounts:
        - name: dev
          mountPath: /host/dev
        - name: proc
          mountPath: /host/proc
        - name: sys
          mountPath: /host/sys
        - name: rootfs
          mountPath: /rootfs
      tolerations:
      - key: "node-role.kubernetes.io/master"
        operator: "Exists"
        effect: "NoSchedule"
      volumes:
        - name: proc
          hostPath:
            path: /proc
        - name: dev
          hostPath:
            path: /dev
        - name: sys
          hostPath:
            path: /sys
        - name: rootfs
          hostPath:
            path: /

---

apiVersion: v1
kind: Service
metadata:
  name: node-exporter
  namespace: monitor-sa
spec:
  type: ClusterIP
  ports:
  - name: http
    port: 9100
    protocol: TCP
    targetPort: 31672
  selector:
    name: node-exporter

kubectl create ns monitor-sa
kubectl apply -f node-exporter.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: datakit-conf
  namespace: datakit
data:
    kubernetesprometheus.conf: |-
      [inputs.kubernetesprometheus]
        node_local = true  # Whether to enable NodeLocal mode, distributing collection across nodes
        [[inputs.kubernetesprometheus.instances]]
            role       = "service"     # Required; can be configured as service, pod, endpoints, node
            namespaces = ["monitor-sa"]    # Not required; supports multiple configurations separated by commas; empty matches all
            selector   = ""       # Not required; labels of resources to be collected, used to match selected objects; empty matches all

            scrape     = "true"            # Not required; collection switch; default is true,
            scheme     = "http" 
            port       = "__kubernetes_service_port_%s_port " 
            path       = "/metrics"        # Not required; most Prometheus collection paths are /metrics; specific to actual service metric addresses
            params     = ""                # Not required; HTTP access parameters; string format, e.g., name=nginx&package=middleware; not required
            interval   = "30s"             # Not required; collection frequency; default is 30s

            [inputs.kubernetesprometheus.instances.custom]
              measurement        = "kube_nodeexporter"       # Not required; TrueWatch Metrics name; default uses the first letter of the underscore in the metric
              job_as_measurement = false             # Not required; whether to use the job label value in the data as the Measurements name
              [inputs.kubernetesprometheus.instances.custom.tags]
                instance         = "__kubernetes_mate_instance"    # Optional; Metrics tag
                host             = "__kubernetes_mate_host"        # Optional; Metrics tag
                pod_name         = "__kubernetes_pod_name"         # Optional; Metrics tag
                pod_namespace    = "__kubernetes_pod_namespace"    # Optional; Metrics tag; does not inherit global tags or election tags
                cluster          = "cluster01"                     # Optional

- mountPath: /usr/local/datakit/conf.d/kubernetesprometheus/kubernetesprometheus.conf
  name: datakit-conf
  subPath: kubernetesprometheus.conf
  readOnly: true

kubectl delete -f datakit.yaml
kubectl apply -f datakit.yaml