Re: [Xen-users] domU backup strategy

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

On 17/05/2012 09:44, SÅawek Kosowski wrote:
> I'm looking for efficient backup method of all domUs. I've searched the group 
> and googled for perfect backup solution - without good enough results.
>
> My configuration is following (PV):
> 3 zones: FW, DMZ, LOC
>
> dom0 in LOC minimal config, only hypervisor
> domU1 as FW with OpenVPN running
> domU2 in DMZ with external services
> domU3 in LOC with local services
>
> All domains run with LVM. I can afford for some downtime during the night to make 
> consistent snapshots. Domains are reasonably small<  10 GB. Presumably domU3 
> will have DB partition growing ~150MB / week.
> Now, dom0 won't have an acces to the Internet when domU1 is down. However, I 
> can reconfigure interface on dom0 when doing backup - but I don't want dom0 to 
> have direct access to the net.
>
> Therefore, the idea would be to keep snapshots in separate logical volumes and 
> then mount them to additional domain that will send them to NFS attached with 
> VPN. This solution would require 2x disk space, assuming that volumes would be 
> copied and other domains already running.
> I can keep them stopped and then send the snapshots via NFS, but this would 
> increase the downtime significantly.
>
> By copied I mean rsynced :)
> I plan to backup dom0 by making LVM snapshot on unmounted system.
>
> How it can be done better ?
>
> Slawomir Kosowski
Generally, my "rule of thumb" is to just take a snapshot of the running 
DomU and rsync it to the destination. No downtime required. I completely 
ignore consistency issues, except where it is really important. For 
example, if a DomU runs a database, I also run an additional backup 
method (eq SQL dump from within the DomU).
Hope this makes sense

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