Re: [Condor-users] Condor Virtual Machines with KVM

[Lans Carstensen <Lans.Carstensen@xxxxxxxxxxxxxx>]

The KVM and Xen support use libvirt.  Have you tried starting your VM
from a host in question using straight virsh/virt-manager tools first? 
Have you checked to see if the VM is actually ending up defined in libvirt 
or not (virsh list --all)?  If the VM works with straight libvirt but 
doesn't under Condor but is showing up as defined - compare the libvirt 
definitions of the guests (virsh dumpxml).  If it's not, then make sure 
you have logging properly configured in /etc/libvirt/libvirtd.conf and see 
what that is reporting.

On Wed, 13 Oct 2010, Ryan Jansen wrote:
> Hi everyone,
>
> I'm currently trying to get Condor to run virtual machines using the KVM
> hypervisor, but I'm having some problems.
>
> I have a few machines set up to run VMs through Condor, and, based on their
> log files, they are attempting to start vm universe jobs when I submit them.
> The virtual machine image, however, never gets loaded, and the job fails.
> Condor tries to resubmit it, but it just keeps failing. I think this is due
> to permissions issues related to bridged networking.
>
> It appears that bridged networking is broken in KVM for non-root users. When
> you try to start a virtual machine, KVM (through qemu) tries to create a TAP
> device to connect through your network bridge. Creating a TAP device,
> however, appears to be restricted to root users, and it throws an error when
> you try to start a VM using a non-root account.
>
> So, my question is - can Condor run virtual machines that use bridged
> networking through KVM? Is there a workaround to get past the TAP device
> issue? Does anyone have any experience with Condor and KVM?
>
> Any insight would be very much appreciated.
>
> Thanks,
> Ryan

-- Lans Carstensen, Systems Engineering, Dreamworks Animation
Vision without execution is hallucination.  --  Thomas Edison