Stacked disks

[Joseph Wolff <joe-w0bN8YRwa0o@public.gmane.org>]

Hello,

I would like to set up stacked disk images as follows:

1) Base-image of Ubuntu, with ubuntu-minimal installed.

2) Multiple other images all based on the single image above, with 
various single-purpose packages installed; eg Apache, Exim, etc.

Now, comes the hard part:

Q2: What happens if I change the underlying ubuntu-minimal image (For a 
good example, to apply security updates), while several of the other 
"upper" images (Apache Exim, etc) are running?

Q1: Easier: If everything is down, can I change the underlying image and 
will the changes be properly reflected in the "upper" (dependent) images?


I see problems with simply a file-based algorithm which looks first in 
the upper image, and then in the base image..

It's really a reconciliation problem..


FYI: I was a KVM forum attendee; I'm building a hosting infrastructure 
based on KVM, and so clearly saving / consolidating space & updates such 
as in the example above is of keen interest to me.

And Thanks again to the Qumranet team for an informative and successful 
conference!


Thanks,
Joe



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