Really short HOWTO here. I want to share files from my desktop running Ubuntu, to my Beaglebone Black, which is running Angstrom Linux. Here’s how I did it:

1. Install nfs-server on the Ubuntu machine

# apt-get install nfs-kernel-server

2. Edit /etc/exports, adding this line:

/home/martin/beaglebone_nfs 192.168.1.125(rw)

3. Create the directory on the server side (as normal user)

$ mkdir /home/martin/beaglebone_nfs

4. Install nfs-utils-client on Beaglebone (Angstrom) side

root@beaglebone:~# opkg update
root@beaglebone:~# opkg install nfs-utils-client

5. Re[start] the NFS server on the Ubuntu side

# service nfs-kernel-server restart

6. Mount your NFS share on the Beaglebone side

root@beaglebone:~# mount -onolock -t nfs 192.168.1.128:/home/martin/beaglebone_nfs /mnt

7. And to make it mount every time you reboot, add a line to /etc/fstab:

192.168.1.128:/home/martin/beaglebone_nfs /mnt nfs defaults,nolock 0 0

8. Unmount and remount from fstab to ensure that you got the fstab line correct (without rebooting)

# umount /mnt
# mount -a
# df
Filesystem                                1K-blocks     Used Available Use% Mounted on
rootfs                                      1738184  1175444    472776  72% /
/dev/root                                   1738184  1175444    472776  72% /
devtmpfs                                     255280        0    255280   0% /dev
tmpfs                                        255408        0    255408   0% /dev/shm
tmpfs                                        255408      220    255188   1% /run
tmpfs                                        255408        0    255408   0% /sys/fs/cgroup
tmpfs                                        255408        4    255404   1% /tmp
192.168.1.128:/home/martin/beaglebone_nfs  22145024 15797248   5199872  76% /mnt

And there you have it.