# services/maintenance/rpi-resource-reservation-daemonset.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: rpi-resource-reservation
  namespace: maintenance
spec:
  selector:
    matchLabels:
      app: rpi-resource-reservation
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: rpi-resource-reservation
      annotations:
        atlas.bstein.dev/reservation-revision: "2026-05-19-5"
    spec:
      hostPID: true # Needed for nsenter to run host systemd reloads after config writes.
      serviceAccountName: node-nofile
      nodeSelector:
        node-role.kubernetes.io/worker: "true"
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: hardware
                    operator: In
                    values:
                      - rpi4
                      - rpi5
      tolerations:
        - key: node.kubernetes.io/unschedulable
          operator: Exists
          effect: NoSchedule
        - key: node.kubernetes.io/not-ready
          operator: Exists
          effect: NoExecute
        - key: node.kubernetes.io/unreachable
          operator: Exists
          effect: NoExecute
      containers:
        - name: reservation
          image: bitnami/kubectl@sha256:554ab88b1858e8424c55de37ad417b16f2a0e65d1607aa0f3fe3ce9b9f10b131
          command: ["/usr/bin/env", "bash"]
          args: ["/scripts/rpi_resource_reservation.sh"]
          env:
            - name: ATLAS_RPI_AUTO_RESTART
              value: "false"
          resources:
            requests:
              cpu: 10m
              memory: 32Mi
            limits:
              cpu: 100m
              memory: 96Mi
          securityContext:
            privileged: true # Required to write host kubelet reservation files under /host.
            runAsUser: 0
          volumeMounts:
            - name: host-root
              mountPath: /host
            - name: script
              mountPath: /scripts
              readOnly: true
      volumes:
        - name: host-root
          hostPath:
            path: /
        - name: script
          configMap:
            name: rpi-resource-reservation-script
            defaultMode: 0555