# =============================================================================
# node-exporter -- metriques systeme du noeud
# =============================================================================
# Presence justifiee par une seule alerte, mais la plus importante de toutes :
# le disque plein. Un disque sature arrete PostgreSQL, k3s et les sauvegardes
# en meme temps, et c'est la panne la plus frequente d'un serveur laisse seul.
#
# Port 9101 et non 9100 : 9100 est deja l'entrypoint metrics de Traefik, et
# confondre les deux cibles rend le diagnostic penible.
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-exporter
  namespace: monitoring
  labels:
    app.kubernetes.io/name: node-exporter
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: node-exporter
  template:
    metadata:
      labels:
        app.kubernetes.io/name: node-exporter
    spec:
      hostNetwork: true
      hostPID: true
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: node-exporter
          image: prom/node-exporter:v1.8.2
          args:
            - --path.procfs=/host/proc
            - --path.sysfs=/host/sys
            - --path.rootfs=/host/root
            - --web.listen-address=:9101
            - --collector.filesystem.mount-points-exclude=^/(dev|proc|sys|var/lib/docker/.+|var/lib/kubelet/.+|var/lib/rancher/.+)($|/)
          ports:
            - name: metrics
              containerPort: 9101
              hostPort: 9101
          resources:
            requests:
              cpu: 20m
              memory: 32Mi
            limits:
              cpu: 100m
              memory: 128Mi
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop: ["ALL"]
          volumeMounts:
            - name: proc
              mountPath: /host/proc
              readOnly: true
            - name: sys
              mountPath: /host/sys
              readOnly: true
            - name: root
              mountPath: /host/root
              mountPropagation: HostToContainer
              readOnly: true
      volumes:
        - name: proc
          hostPath: { path: /proc }
        - name: sys
          hostPath: { path: /sys }
        - name: root
          hostPath: { path: / }
      tolerations:
        - effect: NoSchedule
          operator: Exists
---
apiVersion: v1
kind: Service
metadata:
  name: node-exporter
  namespace: monitoring
  labels:
    app.kubernetes.io/name: node-exporter
spec:
  clusterIP: None
  selector:
    app.kubernetes.io/name: node-exporter
  ports:
    - name: metrics
      port: 9101
      targetPort: metrics