apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-node-exporter
  namespace: prometheus
  labels:
    app: prometheus-node-exporter
spec:
  replicas: 3
  selector:
    matchLabels:
      app: prometheus-node-exporter
  template:
    metadata:
      labels:
        app: prometheus-node-exporter
    spec:
      hostNetwork: true
      hostPID: true
      topologySpreadConstraints:
        - maxSkew: 1
          topologyKey: kubernetes.io/hostname
          whenUnsatisfiable: DoNotSchedule
          labelSelector:
            matchLabels:
              app: prometheus-node-exporter
      securityContext:
        runAsUser: 0
        runAsGroup: 0
      containers:
        - name: prometheus-node-exporter
          image: prom/node-exporter
          args:
            - "--path.rootfs=/host"
          volumeMounts:
            - name: node-volume
              mountPath: /host
              readOnly: true
              mountPropagation: HostToContainer
      volumes:
        - name: node-volume
          hostPath:
            path: /
            type: Directory