On Sat, 2007-01-13 at 11:39 +0530, Ligesh wrote:
> On Sat, Jan 13, 2007 at 12:57:04AM +0800, Tim Post wrote:
> > Take backup of only these directories.
> >
> > /etc
> > /var
> > /home
> > /usr/local
> >
>
> The same effect can be better achieved by taking an incremental backup
> relative to the OSimage
> with which the vm was built. So full backup is taken not per VM, but rather
> PER Distro or PER osimage.
> I am working on a solution using the concept of hard links as used by
> rsnapshot. IN that case, we will
> just take a full backup of the distro, and then use rsync to honour hard
> links and break them if it encounters
> a new version. That would mean that the name of the OSimage should be kept in
> the config file, but that can be
> done as a comment.
Not a bad idea, actually, and I was looking at using something similar
to the database that slocate uses to speed this up. This avoids having
to keep the original image mounted, and lets you update a change to that
image to many places easily.
Then (as you suggest) an incremental backup based on whats different
than in the original template.
>
>
> See, with VM we can always go for hard science. :-)
Not quite, but close.
> I have always been scared of special cases. In the provider scenario with
> large number of identical virtual machines,
> it could lead to very large space saving, and yet, you get 100% consistent
> backup.
That would be cool. Being able to restore one of several dated backups
for any VM would be ideal, as some people need to revert to yesterday's
data, or last week's .. or a combination of the two.
If a VM is compromised and defaced, and 20 minutes later a new snapshot
is taken.. then the backup is useless. Keeping dated backups with a
selectable retention time per VM would be the ideal goal :)
>
> Thanks.
>
>
>
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