[Users] Can oVirt be installed in a virtual machine?
Itamar Heim
iheim at redhat.com
Sat Oct 6 20:12:48 UTC 2012
On 10/06/2012 09:48 PM, Nicolas Chenier wrote:
> Are there any issues running oVirt at a remote location than the
> oVirt-node machines?
>
> I have a site-to-site VPN, ovirt-node machines at one end and an ovirt
> machine at the other.
>
> Is there a lot of traffic (bandwidth) use between ovirt and ovirt-node
> machines? My iSCSI NAS is with my ovirt-node machines.
>
> I have 10mbit down and 1 mbit up at my remote site running the ovirt
> server... my ovirt-nodes and nas are at a colocation centre.
we have deployments running a manager on one site and nodes on the other
site.
i recommend checking the traffic bandwidth for your case.
the node traffic is mainly affected by number of VMs per node, unless
you have a large number of VMs per node you should be fine.
(we do need to optimize the traffic between nodes to engine a bit)
>
> Much appreciated!
>
>
>
>
> On Sun, Sep 23, 2012 at 9:34 AM, Keith Robertson <kroberts at redhat.com
> <mailto:kroberts at redhat.com>> wrote:
>
> 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>
>>>>
>>>>
>>>>
>>>>
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>>>> Users at ovirt.org <mailto:Users at ovirt.org>
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>>
>>
>>
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