apiVersion: v1
kind: ConfigMap
metadata:
  name: set-nfs-readahead-rule-config
  namespace: default
data:
  99-nfs.rules: |
    SUBSYSTEM=="bdi", ACTION=="add", PROGRAM="/usr/bin/awk -v bdi=$kernel 'BEGIN{ret=1} {if ($4 == bdi) {ret=0}} END{exit ret}' /proc/fs/nfsfs/volumes", ATTR{read_ahead_kb}="15380"
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: set-nfs-readahead-rule
  namespace: default
spec:
  selector:
    matchLabels:
      name: set-nfs-readahead-rule
  template:
    metadata:
      labels:
        name: set-nfs-readahead-rule
    spec:
      volumes:
      - name: config-volume
        configMap:
          name: set-nfs-readahead-rule-config
      - name: host-mount
        hostPath:
          path: /etc/udev/rules.d
      containers:
      - name: main-container
        image: k8s.gcr.io/pause:3.1
      initContainers:
      - name: init-privileged
        command:
        - /bin/sh
        - -c
        - |
          #!/bin/sh
          cp /tmp/99-nfs.rules /host/99-nfs.rules
          /usr/bin/nsenter -m/proc/1/ns/mnt -- udevadm control --reload
        image: alpine
        imagePullPolicy: Always
        volumeMounts:
        - name: config-volume
          mountPath: /tmp
        - name: host-mount
          mountPath: /host
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 200Mi
        securityContext:
          privileged: true
        stdin: true
        stdinOnce: true
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        tty: true
      nodeSelector:
        kubernetes.io/os: linux
        kubernetes.azure.com/mode: user
      tolerations:
      - key: workload.sas.com/class
        operator: Equal
        value: compute
        effect: NoSchedule
      - key: workload.sas.com/class
        operator: Equal
        value: connect
        effect: NoSchedule
      - key: workload.sas.com/class
        operator: Equal
        value: cas
        effect: NoSchedule
      priorityClassName: system-node-critical
      dnsPolicy: ClusterFirst
      enableServiceLinks: true
      hostPID: true