Filesystem overlay ?

[Peter L. Peres]

On Fri, 4 Feb 2005, Adil Kodian wrote:

> but i doubt if it is as easy as specifying the right commands to mount -
> atleast i couldnt get it with a simple google. A simple solution is to
> create many 1mb tmpfs partitions in RAM that can be mounted as any folder
> under /var - tmpfs dynamically resize these partitions in memory depending
> on utilization. You must remember, this requires a significant amount of
> ram. A better solution is to put in a dummy 10 or 20 gig hard drive, and get
> the OS on the liveCD to reformat (and if needed -repartition) the hard drive
> on every boot to create writable disk partitions for every install.
> Depending on your system this can be really fast if you use reiserfs. This
> is somewhat a hybrid between a full liveCD and a full install.

What would it take to have a script copy /var from cdrom into the 
partition on hdd at boot time, then mount this /var partition onto the 
/var from cdrom, thus shadowing it.

Peter
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