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OK, thanks for the advice, I just updated my environment to use Xen 4.1.1
and libvirt.

I've changed the SQL DB table nova.networks to use the bridge xenbr0 instead
of br100, but when I try to start an instance, the cloud controller's
nova-compute gives me an error searching for br100, and the instance is
frozen in the networking phase:

(nova): TRACE: NotFound: No network for bridge br100

I already restarted all nova-computes, is there anywhere else I should
change the bridge name to xenbr0? I only have one network configured in
nova.networks and it is using xenbr0 as bridge.


Em 22 de agosto de 2011 16:02, Todd Deshane <todd.deshane at xen.org> escreveu:

> 2011/8/22 Rogério Vinhal Nunes <rogervn at dcc.ufmg.br>:
> > Hi, I'm new to Nova and would like to clear up some issues.
> >
> > The Nova's compute node networking configuration creates the default
> bridge
> > (br100), copying eth0 values and connecting the actual eth0 along with
> the
> > VMs. Xen does almost that, it renames the physical eth0 to peth0 and
> creates
> > a bridge named eth0 that connects the VMs and peth0.
> >
> > Could Nova work using the Xen's eth0 bridge? I think if it was the old
> > '"xenbr0" bridge it could be easier just to change the bridge name in the
> > DB, but how does that work even with the controller not habing Xen
> installed
> > (so eth0 would be the real interface)?
> >
>
> What version of Xen do you have and on what distro?
>
> Xen 4.1+ doesn't do this crazy renaming anymore and instead uses the
> built in distro supported networking. Using the distro supported
> networking is likely to work better, so it is often recommended. See:
>
> http://wiki.xensource.com/xenwiki/HostConfiguration/Networking (this
> should work with any version of Xen + Linux)
>
> > Also, in the Administrator's Manual, it says that you need KVM + libvirt
> for
> > live migration, would Nova work with Xen for live migration?
> >
>
> It should work the same, but I don't know how much it has been tested.
> Let us know if it doesn't work.
>
> A lot of the Xen testing up to this point has been on Citrix XenServer
> and its open source counterpart XCP. We'd love to see Xen the
> hypervisor work fine as it seems that is some interest there too.
>
> libvirt works with Xen hypervisor, so it should work just like it does with
> KVM.
>
> Feel free to bring xen-specific issues over to the appropriate xen
> mailings lists.
>
> Thanks,
> Todd
>
> --
> Todd Deshane
> http://www.linkedin.com/in/deshantm
> http://www.xen.org/products/cloudxen.html
> http://runningxen.com/
>
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