Trying to setup a cluster to run John...
Booted the PXE Server and I ran the script posted by tripleboc devised which took care of the python issue (thanks). But on the client nodes, while booting off the network, the process crashes with the following error:-

*creating /etc/fstab
linuxrc: linuxrc: 188: cannot create union/etc/fstab: Directory nonexistant
GFS2: path_lookup on /mnt/boot returned error
GFS2: gfs2 mount does not exist
*changing root directory...
Fatal error occured - Can't find executable chroot command
*Something went wrong and we can't continue. This should never happen.
*Please reboot your computer with Ctrl+Alt+Delete ...
/union#

Please advise....