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xen-users
Re: [Xen-users] Backing up "live" Xen systems?
Hi Steve.
Steve Kemp wrote:
I've been testing Xen for a few weeks now and am just about to
put it into production use. (I wrote some scripts to create
Debian images easily; the tools are included in Debian Sid as
"xen-tools".)
:-)
The only thing troubling me at the moment is backing up the
virtual instances.
I'm looking to run about four virtual systems upon a host. If
the physical host dies then I'm going to be in trouble without
backups!
I realise I can setup traditional backups within the virtual
instances using rsync, scp, or a backup agent. But I'm curious
about backing up images live. (Primarily to avoid having to
setup near identical scripts upon each instance and make sure
they work correctly.)
If you place your images on LVM you should be able to take a snapshot of
the filesystem(s) and mount or dump this (you probably have to fsck the
snapshot if you are to use dump). That should be rather painless.
It strikes me that the live-migration support does a lot of the
things that a backup of a live system should do - literally sending
the contents of the systems image + memory to a new host.
Live migration does not migrate the filesystem image - so using it for
backup purposes is rather hard. :-)
--
There are only 10 different kinds of people in the world,
those who understand binary, and those who don't.
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