What is the best/recomended/official way to backup VMs

Kent Tenney ktenney at gmail.com
Fri Aug 14 14:58:39 UTC 2009


Can ZFS or btrfs create successful snapshots of VMs?

Thanks,
Kent

On Thu, Aug 13, 2009 at 3:24 PM, Etienne
Goyer<etienne.goyer at canonical.com> wrote:
> Mat wrote:
>> Just an idea: what if both a KVM snapshot and the LVM snapshot could be
>> done at the same time? It should then be possible to bring the VM up in
>> a running state.
>
> I guess that might be good in some circumstance, but only when it's ok
> to get a system in a previous running state.  This is not always the
> case; for example, you would not want a mail server to go back a couple
> of hours in time (mail in the queue at backup time would get redelivered
> at restore time, mail deleted from user inbox would reappear, mail
> delivered to user's inbox since backup would disappear, etc).
>
>> My idea is probably trying to address the underlining issue from the
>> wrong angle. I suppose that if I needed a service to run 24/7 and
>> downtime was not acceptable, I would run my services in a server farm
>> with proper fault-tolerance and redundancy, and where database backup
>> and recoveries wouldn't be done on the VM level.
>
> I do not know.  Backup is a tough problem, and there is no
> one-size-fit-all solution.  Dumping the file system content and
> checkpointing system states have been the two most common approaches to
> date, but they are flawed for many applications.  It's all a matter of
> compromise.  But yeah. backup is second best after resiliency, so you
> may want to invest your time and brain cycles in that instead.
>
> Just my 0.02$ ...
>
> --
> Etienne Goyer
> Technical Account Manager - Canonical Ltd
> Ubuntu Certified Instructor
>
>  ~= Ubuntu: Linux for Human Beings =~
>
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