[one-users] Architecture advice

[Shankhadeep Shome]

What is your definition of large? This is a difficult question to answer
without more details.


On Wed, Mar 26, 2014 at 7:08 PM, Stuart Longland <stuartl at vrt.com.au> wrote:

> On 18/03/14 02:35, Gandalf Corvotempesta wrote:
> > Hi to all
> > i'm planning a brand new cloud infrastructure with opennebula.
> > I'll have many KVM nodes and 3 "management nodes" where I would like
> > to place OpenNebula, Sunstone and something else used to orchestrate
> > the whole infrastructure
> >
> > Simple question: can I use these 3 nodes to power on OpenNebula (in
> > HA-Configuration) and also host some virtual machines managed by
> > OpenNebula ?
>
> I could be wrong, I'm new to OpenNebula myself, but from what I've seen,
> the management node isn't a particularly heavyweight process.
>
> I had it running semi-successfully on an old server here (pre
> virtualisation-technology).  I say semi-successfully; the machine had a
> SCSI RAID card that took a dislike to Ubuntu 12.04, so the machine I had
> as the master would die after 8 hours.
>
> I was using SSH based transfers (so no shared storage) at the time.
>
> Despite this, the VMs held up, they just couldn't be managed.  This
> won't be the case if your VM hosts mount any space off the frontend
> node: in which case a true HA set-up is needed.  (And lets face it, I
> wouldn't recommend running the master node as a VM if you're going to be
> mounting storage directly off it for the hosts.)
>
> Based on this it would seem you could do a HA setup with some shared
> storage between the nodes, either a common SAN or DR:BD to handle the
> OpenNebula frontend.
>
> Seeing as OpenNebula will want to control libvirt on the hosts (being
> that you're also suggesting making these run the OpenNebula-managed VMs
> too, this might have to be a KVM process managed outside of libvirt.
> Not overly difficult, just fiddly.
>
> But, as I say, I could be wrong, so take the above advice with a grain
> of salt.
>
> Regards,
> --
> Stuart Longland
> Systems Engineer
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>
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