Lennart, can you explain that process in more detail?  I mean, what tool would one PXE boot from? 

Walter, that is helpful but still sounds pretty time-consuming -- I would like to find a way to have an unattended re-imaging that can run more-or-less simultaneously on all the machines. 



On Tue, Oct 7, 2014 at 12:31 AM, Walter Dnes <waltdnes@waltdnes.org> wrote:
  Can you do a basic install with / ( including /root, and /usr ) on
/dev/sda1 (approx 6 to 8 gigabytes)?  *IMPORTANT*... include sshd as
part of the basic install, and have it start automatically at boot.
- "dd" the / partition to a USB key. Assuming the key is mounted as
   /media/key
  dd -bs=1M -if=/dev/sda1 -of=/media/key/imagefile

  To copy the partition back
- boot the machine to be installed, using any linux install ISO or USB
  key, then insert the USB key and "dd" the other way...
  dd -bs=1M -if=/media/key/imagefile -of=/dev/sda1

  Final customization
- remove the linux boot ISO/key and the data key and reboot the machine
- assuming sshd works, you can now do scripted final customization over
  the net, including running apt-get for updates, and copying user home
  dirs, etc, etc.

--
Walter Dnes <waltdnes@waltdnes.org>