Re: [Xen-users] Re: Redundant server setup

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Matthew Palmer wrote:
> On Thu, May 11, 2006 at 11:13:48PM +0200, John wrote:
> > Hello all,
> >
> > I would like your advise/opinion on setting up a redundant Xen
> > infrastructure. We have two identical boxes now running xen: vs01 and
> > vs02 - interconnected with a cross cable on eth1.
> >
> > What I would like to realize is my virtual hosts not being dependent on
> > (a) physical hardware and (b) potential Xen failures due to
> > misconfiration anywhere in the machine. 
> >
> > All virtual servers are running on vs01 and I plan to rsync
> > the whole /etc/xen directory to vs02 every night. I tried using scp and that
> > worked OK. 
> >
> > Would this be a good setup to realize redundancy? 
> Not particularly.
>
> What you want is drbd syncing your block devices, with heartbeat maintaining
> the "services" of your domUs.  That'll save you from hardware failures, and
> really nasty Xen misconfigurations (of the "I b0rk3d my grub" severity).  It
> won't save you from minor stuff-ups, like giving a domU the wrong bridge --
> but then again, there's not much that will manage to save yourself from
> yourself like that.
>
> To ensure that configurations are properly synced across dom0s, I'd highly
> recommend a structured configuration management system like Puppet.  The
> domUs can be managed using the same tool, as well.
I don't suppose anybody's written a HOWTO on this.  I'm looking to do 
something similar.
Miles Fidelman

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