[Users] Is it possible to run the node and engine on the same box?

[Livnat Peer]

On 20/02/12 03:55, Perry Myers wrote:
> On 02/19/2012 07:17 PM, Brent Bolin wrote:
>>>> and the install just not working without more then one attempt.
>>>
>>> Can you provide more details?  Otherwise we can't fix the issues.
>>
>> Just that the installer says it fails and the only option is to
>> reboot.  Sometimes going into the troubleshooting option and selecting
>> "reinstall" fixes it other times not.  Makes me wonder if ovirt iso
>> install can't handle pre existing partions/lvm remnants.
> 
> It should be able to.  Over the past months we've made numerous fixes
> for this.
> 
> However, if you have already installed oVirt Node to the disk, you need
> to select the 'Reinstall' option from the Grub menu (listed under
> Troubleshooting menu option in Grub)
> 
> So perhaps what you're seeing is Install vs. Reinstall.  In any case, we
> should handle this more gracefully or at least provide some add'l
> diagnostics to indicate the core reason why it failed to install.
> 
> If you could file a bug against the ovirt-node component in bugzilla, we
> can definitely try to make this more user friendly.
> 
>>>>  Even tried breaking in as root to install ovirt engine repos without
>>>> success.  Getting some odd errors when trying to set the root password
>>>> to a known value.
>>>
>>> Echoing what Doron said in his reply... Don't try to install oVirt
>>> Engine onto oVirt Node.  The stateless nature of oVirt Node makes
>>> running the mgmt server there not possible.
>>
>> I don't understand this statement.  Are you talking about firewall
>> stateless connections?
> 
> The filesystem in oVirt Node is stateless.  If you attempt to install an
> rpm, when you reboot the changes are lost.  The entire filesystem is in
> RAM aside from a few select configuration files that are manually
> persisted to a 5MB config partition on disk.
> 
>>> If you want to run the Engine on the same machine as other oVirt
>>> controlled VMs, then you should use a heavyweight install of Fedora and
>>> put the Engine and VDSM side by side on that.
>>>
>>> The fact that you can't easily run oVirt Engine on the oVirt Node is not
>>> a bug, or a sign of instability.  It's simply not what oVirt Node was
>>> designed for.
>>
>> I understand this.  However in these days of my old age I don't run
>> half a dozen chassis, skins, power supplies, hd's, mb etc... like to
>> use virtualization hosts for my personal lab environment.  Right now I
>> accomplish this using a kvm host and virt-manager
> 
> Right.  We're not suggesting that you can't use oVirt in this way.  You
> should absolutely be able to use a single physical host running Fedora
> 16 and on that host run both the oVirt Engine as well as vdsm, so that
> you can have an 'oVirt in a single box' setup.
> 
> All we were saying here is that you can't use oVirt Node specifically to
> do the above, since it's a livecd with a stateless filesystem and
> contains 'just enough OS' to run virtual machines, and no where near
> enough OS to run a mgmt server.
> 
> Now, what should be possible... is to run oVirt Node and run on that
> node a single VM that is not managed by oVirt Engine, and run the engine
> inside that VM.  However in order to do this, you'd need to get past a
> chicken-egg issue with starting a VM on oVirt Node prior to it being
> registered with the oVirt Engine.
> 
> I wonder if we should expose a special command/config option in oVirt
> Node to allow it to run a single VM so that oVirt Engine can be
> colocated as a VM.  Anyone have any thoughts on that?
> 

I think worth opening a discussion on arch list.

>> The real power from what I read about the ovirt road map is using
>> native kvm, management server without the need of windows server,
>> vmotion type clustering etc...
> 
> All of that is accurate
> 
>> I am going to look over Doron notes.  Specifically the networking.
>>
>> Cheers... keep up the good work.
> 
> Thanks for the feedback and experimentation :)
> 
> Perry
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users