The only other obstacles I can see to creating a setup where multiple sytems
share the same root filesystem is a modified version of mount that doesn't use
/etc/mtab but uses /proc/mounts, and could understand some fancy substitutions
in the fstab, eg
server:/usr/export/var.@HOSTNAME@ /var nfs defaults 0 0
server:/usr/export/swapfiles/swap.@HOSTNAME@ none swap defaults 0 0
would mount the appropriate things off the server without having a different
fstab for different clients. This however I can do myself. (I don't believe it
is possible to share /var, though I may be wrong. /var/log/wtmp at least must
persist over reboots (so it can't be on a memfs, unlike stuff in /var/run and
/var/lock) and must be unique to each machine).
Also, a memfs for /tmp on diskless machines would be nice - there is one
around, I believe. Does anybody know where it hides out and how stable it is?
David