[Users] Can oVirt be installed in a virtual machine?

[Keith Robertson]

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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>
>
>

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