#creates a static pod on each flatcar node and runs node-exporter
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: vm
spec:
  selector:
    matchLabels:
      app: node-exporter
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: node-exporter
    spec:
      hostNetwork: true
      hostPID: true
      dnsPolicy: ClusterFirstWithHostNet
      tolerations:
        - operator: Exists
        - key: node-role.kubernetes.io/control-plane
          operator: Exists
          effect: NoSchedule
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
      containers:
        - name: node-exporter
          image: quay.io/prometheus/node-exporter:latest
          args:
            - --path.rootfs=/host
            - --web.listen-address=:9100
            - --collector.filesystem.mount-points-exclude=^/(dev|proc|sys|var/lib/docker/.+|var/lib/containerd/.+|var/lib/kubelet/.+)($|/)
            - --collector.filesystem.fs-types-exclude=^(autofs|binfmt_misc|bpf|cgroup2?|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|iso9660|mqueue|nsfs|overlay|proc|pstore|rpc_pipefs|securityfs|selinuxfs|squashfs|sysfs|tracefs)$
          ports:
            - name: metrics
              containerPort: 9100
              hostPort: 9100
              protocol: TCP
          securityContext:
            runAsNonRoot: true
            runAsUser: 65534
            runAsGroup: 65534
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
          resources:
            requests:
              cpu: 50m
              memory: 64Mi
            limits:
              memory: 256Mi
          volumeMounts:
            - name: root
              mountPath: /host
              mountPropagation: HostToContainer
              readOnly: true
            - name: sys
              mountPath: /host/sys
              readOnly: true
            - name: proc
              mountPath: /host/proc
              readOnly: true
      volumes:
        - name: root
          hostPath:
            path: /
            type: Directory
        - name: sys
          hostPath:
            path: /sys
            type: Directory
        - name: proc
          hostPath:
            path: /proc
            type: Directory