[Xen-users] Re: Move doms to new machine

[Paul Archer <parcher@xxxxxxx>]

> Date: Mon, 14 May 2007 13:52:12 -0400
> From: Maximilian Freisinger <deepc2005@xxxxxxxxxxx>
> Subject: [Xen-users] Move doms to new machine
> To: <xen-users@xxxxxxxxxxxxxxxxxxx>
> Message-ID: <BAY121-W5673D7453D66FBE5FA5D0BF3E0@xxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
> Hello,I need to move some doms from an old rootserver to my new one.The 
> domUs are running on lvm.The problem is, that i first have to stop the 
> old one before i get the new on online.So i somehow have to save the 
> domUs to my local machine and then reintegrate them on the new server.My 
> question now is, how do i do that???Thx, DC
Your best bet is to use rsync to copy the domain. Start by creating the 
filesystem on the new machine, then mount it, and rsync the domain on the 
old machine to it. You can do this either by mounting the LVM on the dom0, 
or from within the running domU.
Copy the configuration for the domain over from the old host to the new 
one, and use it to bring up the domU on the new host briefly. This is just 
to verify that it will come up OK. Be careful here, as the new copy will 
have the same IP settings as the old one, so you can end up with a 
conflict on your network.
Once you're confident that your setup is OK on the new host, do two more 
rsync's. The first one will be while the domU is still running. This will 
get the original and the copy as close to each other as possible. Then 
shut down the original domU, do the last rsync, and start the domU on the 
new machine. Depending on how long the rysnc takes, your downtime should 
be just a few minutes.
Don't forget to explore the options to rsync. You'll want -a (for 
'archive'), and --delete (to make sure files the have been deleted on the 
original get deleted on the copy).

root@oldhost# rsync -aP --delete /var/vm/domU-orig  newhost:/var/vm/domU-copy

Paul

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