Network File System configuration

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Introduction

On this page, you will find usefull informations to configure NFS (Network File System) on your Host and your Target.

NFS server on your development Host

Installation

  • On Fedora, NFS is part of your distribution so you normally don't need to install it.
  • On Ubuntu/Kubuntu:
$ sudo apt-get install nfs-kernel-server
  • On OpenSUSE:
$ sudo zypper install yast2-nfs-server
  • On Gentoo:
# emerge -av nfs-utils

You can also take a look at the gentoo wiki

Configuration

/etc/exports

  • You have to declare the directory where you're going to store the files you want to share accross the network. For that you have to modify the /etc/exports file with (for example):
$ sudo vim /etc/exports

and add it (at the end of the file):

...
# Directory for Armadeus:
/local/export     192.168.0.0/255.255.255.0(ro,no_root_squash,sync)
...
In that case your Host will authorize all client from the subnet 192.168.*.* to access /local/export in read only mode. If you want read/write access from your APF to your exported dir, then replace ro with rw.
  • In order to use the same folder through TFTP and NFS, using the default U-Boot scripts for example, it recommended to export your /tftpboot folder as well:
...
# Directory for Armadeus:
/local/export     192.168.0.0/255.255.255.0(ro,no_root_squash,sync)
/tftpboot     192.168.0.0/255.255.255.0(ro,no_root_squash,sync)
...
  • If not existing, create your export directory (for example):
$ sudo mkdir -p /local/export
$ sudo chown -R $USER:$GROUP /local/export/

/etc/hosts

  • You have to declare your APF/OPOS board in the PC hosts list, to fully support NFS access from U-Boot. For such purpose you have to update the /etc/hosts file with your preferred editor (as root):
$ sudo vim /etc/hosts

and add the IP address of your board after the localhost definition for example :

127.0.0.1	localhost
192.168.0.10	apf
...

Restart of NFS server

On Fedora On Ubuntu/Kubuntu/debian On OpenSUSE On Gentoo
 # /sbin/service nfs restart

Next time you boot, you can check your NFS server status with:

 # /sbin/service nfs status

and if not started then:

 # /sbin/service nfs start
 $ sudo /etc/init.d/nfs-kernel-server restart

Next time you boot, you can check your NFS server status with: System Settings->System services

 # /etc/init.d/nfsserver restart
 # /etc/init.d/nfs restart

NFS usage on your Armadeus board

Mount the NFS partition manually

  • check if mount point is existing (for example we will take /mnt/nfs):
# ls /mnt
  • if not existing, create the mount point:
 # mkdir -p /mnt/nfs
  • mount it (for example):
 # mount -t nfs 192.168.0.2:/local/export /mnt/nfs

Here 192.168.0.2 is your Host IP address and /local/export the name of your Host directory you want to mount.

Note Note: On some nfs server (for exemple with debian wheezy) there is a warning when we mount nfs partition. But the filesystem is mounted :
# mount /mnt/nfs/
svc: failed to register lockdv1 RPC service (errno 97).


Mount the NFS partition automatically at each boot from FLASH

  • login to your Armadeus board as root
  • open the /etc/fstab file and add this line:
<host-ip>:/<path-to-shared-folder> /mnt/<path-to-mount-folder> nfs hard,intr,rsize=8192,wsize=8192 0 0

example:

192.168.0.2:/local/export /mnt/nfs nfs hard,intr,rsize=8192,wsize=8192 0 0
  • check your modification:
 # mount /mnt/nfs
  • reboot your board
 # reboot
  • and enjoy the result
 # df
 # ls /mnt/nfs

When you have a problem, verify that the NFS server is running on the host:

 $ /etc/init.d/nfs-kernel-server status

or

 $ /sbin/service nfs status

Boot from NFS

This boot procedure is usefull to test a modified rootfs and/or a linux kernel keeping safe the original flash memory content of your board.

  • on your Host, expand generated rootfs image to your NFS export dir (for example if your NFS export dir is /tftpboot on your Host) and you want to boot on it using the U-Boot script nfsboot:
 $ make shell_env
 $ source armadeus_env.sh
 $ sudo mkdir -p /tftpboot/$ARMADEUS_BOARD_NAME-root/boot
 $ sudo tar xvf $ARMADEUS_ROOTFS_TAR -C /tftpboot/$ARMADEUS_BOARD_NAME-root
  • The copy of the Linux kernel to the NFS /boot folder, makes possible to also download it with NFS when booting the board:
 $ sudo cp $ARMADEUS_BINARIES/$ARMADEUS_BOARD_NAME-linux.bin /tftpboot/$ARMADEUS_BOARD_NAME-root/boot/
  • With recent (3.10+) kernels, you also have to copy the Device Tree blobs:
 $ sudo mkdir -p /tftpboot/$ARMADEUS_BOARD_NAME-root/boot/dtbs
 $ sudo cp $ARMADEUS_BINARIES/*.dtb /tftpboot/$ARMADEUS_BOARD_NAME-root/boot/dtbs/
  • On your board, in U-Boot, check if the rootpath envt variable is set accordingly:
 BIOS> printenv rootpath
  • If not, then set it (by default U-boot is configured to use the following path /tftpboot/apfXXXX-root) where apfXXXX may be apf9328, apf27, apf28, apf51, apf6:
 BIOS> setenv rootpath /tftpboot/${board_name}-root
  • save it:
 BIOS> saveenv
  • then boot with:
 BIOS> run nfsboot

Summary of the required Packages:

  • portmap (Buildroot)
  • nfs (busybox)
  • nfs support (Linux, activated by default in Armadeus configuration)

Troubleshooting

RPC: Program not registered

  • If nfsd and mountd daemons are not running on your Host, then you will get a message like:
mount: RPC: Program not registered
  • In that case, restart the NFS service on your Host (see above).

Portmap/RPCbind

  • To successfully mount a NFS drive, portmap/rpcbind daemon should be running on your APF/OPOS, if not, system will hang during some minutes when you launch the mount !!

To check if portmap/rpcbind is running, look at the running processes:

 # ps faux

If portmap/rpcbind is not listed, then launch it manually or install it:

 # /etc/init.d/S13portmap
  • Note: portmap is obsolete since 2017

Connection refused

  • If you get this on your APF when trying to mount:
mount: mounting 192.168.0.2:/local/export on /mnt/nfs/ failed: Connection refused
  • then your kernel might need some extra options:
mount -o port=2049,nolock,proto=tcp 192.168.0.2:/local/export /mnt/nfs/

NFS Server under Windows

For those who want to use the NFS service on Windows, a small and FREE NFS server is available here.

Links