I am building a 4 node raspberry pi cluster,so one head node, and 3 compute nodes, following this tutorial: http://makezine.com/projects/build-a-compact-4-node-raspberry-pi-cluster/And I am trying to use the NFS protocol to share data from a usb stick, what I found is that when I shutdown the pi's and start them the next day, I have to go to the head node and run:    sudo systemctl restart nfs-kernel-server before I can mount the drive on the other nodes. Similarly, from the tutorial it was recommended to update the /etc/fstab file so that the drive is mounted when the node is started. But I'm finding that because I need to run the command above before I can mount the drive, it doesn't work. Does anyone have any suggestions about how to fix this problem?As an update, I was asked to show the status after I had rebooted the system. I did find a warning that the portmapper was not running.      nfs-kernel-server.service - LSB: Kernel NFS server support     Loaded: loaded (/etc/init.d/nfs-kernel-server)     Active: active (exited) since Sun 2016-06-05 20:18:02 UTC; 4min 0s ago     Process: 444 ExecStart=/etc/init.d/nfs-kernel-server start (code=exited, status=0/SUCCESS)     Jun 05 20:18:02 rpi0 nfs-kernel-server[444]: Exporting directories for NFS kernel daemon....     Jun 05 20:18:02 rpi0 nfs-kernel-server[444]: Starting NFS kernel daemon: nfsd     Jun 05 20:18:02 rpi0 nfs-kernel-server[444]: Not starting: portmapper is not running ... (warning).     Jun 05 20:18:02 rpi0 systemd[1]: Started LSB: Kernel NFS server support.
Setting up Network File Share on raspberry pi, need to restart nfs-kernel-server each time the system is started
raspberry pi;nfs