DaemonSet YAML

The DaemonSet YAML is a Deployment without replicas: a selector and a pod template are enough:

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: izleme
spec:
  selector:
    matchLabels:
      app: node-exporter
  template:
    metadata:
      labels:
        app: node-exporter
    spec:
      containers:
        - name: exporter
          image: prom/node-exporter:v1.8.2
          ports:
            - containerPort: 9100

The node-exporter in this example exposes each node's CPU, memory, disk and network metrics to Prometheus.

DaemonSets doing node-level work usually read the node's file system with hostPath, or use the node's network (hostNetwork: true). These are powerful privileges; they should only be given when needed and read-only:

    spec:
      hostNetwork: true
      volumes:
        - name: proc
          hostPath:
            path: /proc
      containers:
        - name: exporter
          volumeMounts:
            - name: proc
              mountPath: /host/proc
              readOnly: true