<div dir="ltr">What is your definition of large? This is a difficult question to answer without more details.</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Mar 26, 2014 at 7:08 PM, Stuart Longland <span dir="ltr"><<a href="mailto:stuartl@vrt.com.au" target="_blank">stuartl@vrt.com.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">On 18/03/14 02:35, Gandalf Corvotempesta wrote:<br>
> Hi to all<br>
> i'm planning a brand new cloud infrastructure with opennebula.<br>
> I'll have many KVM nodes and 3 "management nodes" where I would like<br>
> to place OpenNebula, Sunstone and something else used to orchestrate<br>
> the whole infrastructure<br>
><br>
> Simple question: can I use these 3 nodes to power on OpenNebula (in<br>
> HA-Configuration) and also host some virtual machines managed by<br>
> OpenNebula ?<br>
<br>
</div>I could be wrong, I'm new to OpenNebula myself, but from what I've seen,<br>
the management node isn't a particularly heavyweight process.<br>
<br>
I had it running semi-successfully on an old server here (pre<br>
virtualisation-technology). I say semi-successfully; the machine had a<br>
SCSI RAID card that took a dislike to Ubuntu 12.04, so the machine I had<br>
as the master would die after 8 hours.<br>
<br>
I was using SSH based transfers (so no shared storage) at the time.<br>
<br>
Despite this, the VMs held up, they just couldn't be managed. This<br>
won't be the case if your VM hosts mount any space off the frontend<br>
node: in which case a true HA set-up is needed. (And lets face it, I<br>
wouldn't recommend running the master node as a VM if you're going to be<br>
mounting storage directly off it for the hosts.)<br>
<br>
Based on this it would seem you could do a HA setup with some shared<br>
storage between the nodes, either a common SAN or DR:BD to handle the<br>
OpenNebula frontend.<br>
<br>
Seeing as OpenNebula will want to control libvirt on the hosts (being<br>
that you're also suggesting making these run the OpenNebula-managed VMs<br>
too, this might have to be a KVM process managed outside of libvirt.<br>
Not overly difficult, just fiddly.<br>
<br>
But, as I say, I could be wrong, so take the above advice with a grain<br>
of salt.<br>
<br>
Regards,<br>
<span class="HOEnZb"><font color="#888888">--<br>
Stuart Longland<br>
Systems Engineer<br>
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<br>
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