title: GKE node with modprobe
body: <p>Is there a way to load any kernel module ("modprobe nfsd" in my case) automatically after starting/upgrading nodes or in GKE?  We are running an NFS server pod on our kubernetes cluster and it dies after every GKE upgrade</p>
  
  <p>Tried both cos and ubuntu images, none of them seems to have nfsd loaded by default.</p>
  
  <p>Also tried something like this, but it seems it does not do what it is supposed to do:</p>
  
  <pre><code>kind: DaemonSet
  apiVersion: extensions/v1beta1
  metadata:
    name: nfsd-modprobe
    labels:
      app: nfsd-modprobe
  spec:
    template:
      metadata:
        labels:
          app: nfsd-modprobe
      spec:
        hostPID: true
        containers:
          - name: nfsd-modprobe
            image: gcr.io/google-containers/startup-script:v1
            imagePullPolicy: Always
            securityContext:
              privileged: true
            env:
            - name: STARTUP_SCRIPT
              value: |
                #! /bin/bash
  
                modprobe nfs
                modprobe nfsd
                while true; do sleep 1; done
  </code></pre>