[Users] Can oVirt be installed in a virtual machine?
Keith Robertson
kroberts at redhat.com
Sun Sep 23 13:34:01 UTC 2012
On 09/22/2012 05:35 PM, Nicolas Chenier wrote:
> *Question 1 - if oVirt goes down... do the ovirt-nodes and VMs remain
> up?* Can someone answer this please? :-)
If the oVirt manager (ie. the web application running inside AS7) loses
connectivity to the node, the VM's on that node will keep running. You
should know; however, that the general design is for the manager to
remain in contact with the nodes.
>
> Due to budget and space constraints, I currently have 2 servers total.
>
> What if I did the following:
>
> Server 1) Fedora 17 with KVM/Virt-manager... running oVirt as a VM
> (through virt-manager) off the iSCSI NAS.
Fine
> Server 2) oVirt-node machine - one and only host machine for oVirt
> running on Server 1).
Again fine.
>
> With this setup I can run VMs from iSCSI on oVirt-node Server 2).
Yes, nearly identical to my setup.
>
> In the event that oVirt-node Server 2) goes down... is anything
> stopping me from setting up my VMs on Server 1) with the iSCSI storage
> from the NAS and run my VMs without oVirt through virt-manager?
Yes, I don't think that will work out of the box. It could probably be
done but it would require some manual steps.
>
> This would give me some form of redundancy (requiring manual
> intervention) in the event that my ovirt-node went down... is this a
> feasible setup?
See previous comment.
>
> To make it even more redundant, maybe I should do the following with
> Server 2)
>
> Install Fedora 17 with KVM/Virt-Manager, and VDSM... in the event that
> Server 1) fails... I can run my VMs on Server 2) through virt-manager?
>
> Should I just drop oVirt for now and run virt-manager on my 2 hosts,
> moving VMs manually (as they are running off iSCSI NAS) if a host
> fails? <tear>
It depends on what you are trying to do. oVirt and virt-manager solve
different problems. I would say that virt-manager is probably OK for a
small setup, but I wouldn't deploy an enterprise solution around it.
You have enough gear for a small oVirt setup. Run with that and add
more nodes as you can. My 2c.
>
> Thank you,
>
> Nic
>
>
>
> On Sat, Sep 22, 2012 at 4:09 PM, Keith Robertson <kroberts at redhat.com
> <mailto:kroberts at redhat.com>> wrote:
>
> On 09/22/2012 02:28 PM, Nicolas Chenier wrote:
>> Question - if oVirt goes down... do the ovirt-nodes and VMs
>> remain up?
>>
>>
>> Keith, how would you set yourself up with these specs:
>>
>> 2 host servers (quad-core xeons with 32gigs of ram)
> Are you saying that you only have 2 machines in total, or that you
> have 2 machines that can be dedicated hypervisors (ie. ovirt-node)
> and a third machine that can be a dedicated manager?
>
> If the former then one machine must run some version of *nix
> compatible with oVirt Manager and, the other machine in this
> scenario can simply run ovirt-node.
>
> If the latter, then you have 1 box dedicated as a manager and 2
> boxes as dedicated hypervisors. This is a fairly basic/good setup.
>> 1 iSCSI NAS
>>
>> Starting to think there is no way to achieve HA with this setup?
> Not with only 2 boxes. No.
>
>> oVirt requires a dedicated machine?
> Generally, speaking. Yes.
>
> Truly HA setups aren't cheap and people often have different ideas
> of what constitutes HA. Offhand I would think that you would need...
>
> - 2 boxes for the oVirt manager
> - Clustering software for the manager to facilitate an
> active/passive setup.
> - UPSs (at *least* 2) which can be controlled by clustering
> software. Why? Most clustering SW require a fence device. These
> will be your fence devices.
> - 2 boxes for your hypervisors (ie. ovirt-nodes). This will
> facilitate fail-over from one node to the other.
>
> HA isn't cheap and can't usually be done on 2 boxes, IMO unless
> you're failing over a single app.
>
>
>
>>
>> Thank you!
>>
>> Nic
>>
>> PS. Could oVirt be integrated into ovirt-node on every server?
>>
>>
>>
>> On Sat, Sep 22, 2012 at 2:16 PM, Keith Robertson
>> <kroberts at redhat.com <mailto:kroberts at redhat.com>> wrote:
>>
>> On 09/22/2012 01:09 PM, Nicolas Chenier wrote:
>>> Hi Alan,
>>>
>>> I have oVirt running in a VM off my Desktop (Fedora 17 w/
>>> KVM & Virt-Manager) off my iSCSI NAS.
>>>
>>> I've attached Server #1 as my first host (it's running
>>> ovirt-node).
>>>
>>> In the process of setting up my storage domains. I have a
>>> few questions to the experts out there:
>>>
>>> 1) How do I add my CD .ISOs to setup new VMs? Create iSCSI
>>> storage domain? But then how do I copy my ISOs to it?
>> Create an ISO storage domain and use the ovirt-iso-uploader
>> to add your ISOs and .vfd files into that domain.
>>
>>>
>>> 2) Can I run my oVirt VM from ovirt-node machine, without
>>> running it in oVirt (ie. setup iSCSI in virt-manager (as it
>>> is now) and run oVirt from virt-manager... then I can manage
>>> my hosts through that ovirt VM?
>> Huh? You could run the oVirt Manager from a VM managed by
>> virt-manager... yes. Running the oVirt manager inside a VM
>> on a hypervisor (ie. ovirt-node) controlled by that same
>> manager isn't supported AFAIK because the mgr. could get fenced.
>>
>> To summarize, you can pretty much run the oVirt manager on
>> any supported OS as long as that OS instance isn't running on
>> a hypervisor (ie. ovirt-node) controlled by *that* manager.
>>
>> If you haven't noticed the vocabulary to describe the various
>> components can get a little confusing. ;)
>>
>>
>>>
>>> Not sure if I'm making myself clear... but I'm making
>>> progress. I think as long as you are not managing your oVirt
>>> vm through oVirt itself, the solution should work fine! Just
>>> trying to see if I can get that done on an ovirt-node machine...
>>>
>>> Thank you,
>>>
>>> Nic
>>>
>>>
>>> On Fri, Sep 21, 2012 at 3:31 PM, Alan Johnson
>>> <alan at datdec.com <mailto:alan at datdec.com>> wrote:
>>>
>>> On Wed, Sep 12, 2012 at 9:22 PM, Nicolas Chenier
>>> <dascope at gmail.com <mailto:dascope at gmail.com>> wrote:
>>>
>>> I was under the impression that my oVirt VM would
>>> show up in oVirt and that I could manage it through
>>> there...
>>> What you're saying is that I should just run it
>>> seperatly and not manage it with itself (oVirt)?
>>> keep it on my shared storage so that I can run it
>>> off any of the 2 servers? But not manage it with
>>> oVirt (itself). I think I'm starting to get it now...
>>> I really appreciate your help!
>>> Nic
>>>
>>>
>>> Nic, how did you make out with this? I'm looking to do
>>> the same thing and am wondering if there is any risk in
>>> running the engine on a VM managed by the same engine,
>>> as you were suggesting before. Did you give this a shot?
>>>
>>> Itamar, why did you steer Nic away from this?
>>>
>>> _______________
>>> Alan Johnson
>>> alan at datdec.com <mailto:alan at datdec.com>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org <mailto:Users at ovirt.org>
>>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
>>
>
>
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