libvirt users - May 2011 - Howto set the option script=no for a tap device in the xml file

Hello,

I am trying to run a virtual machine with qemu-kvm and libvirt as a
user. In order to start the virtual machine I setup a tap device
manually, add it to the bridge and activate it via ifconfig. But I
cannot tell libvirt to not try to add the definded tap device to the
bridge by itself. It always fails telling me it cannot add tap0 to br0.

Thats the xml snippet for defining the network:

<interface type='bridge'>
	<mac address='54:52:00:38:75:dd'/>
	<source bridge='br0'/>
	<target dev='tap0'/>
	<model type='virtio'/>
</interface>

Here I would like do define "script=no" to get an output like: -net
tap,vlan=0,ifname=tap0,script=no when libvirt launches the vm.

Regards,
Christian
-- 
Christian Spann - http://www-vs.informatik.uni-ulm.de/~spann


-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5765 bytes
Desc: S/MIME Cryptographic Signature
URL:
<http://listman.redhat.com/archives/libvirt-users/attachments/20110516/daca9e36/attachment.p7s>

Hello people.

	  I had 4 servers (bart,homer, lisa and abraham) where livemigrate
	  went without problems: I was able to make them play beach-volley
	  with a vm instance whose image is on an NFS file system.

	  Then I add a couple more, marge and maggie. I can do things like

	  virsh -c qemu://maggie/system list

	  or launch an interactive session without any problem, so the TLS
	  channel should be properly configured.

	  But when I try to run something like 

	  virsh  migrate --live "one-24" qemu://maggie/system

	  I get a nice "error: operation failed: failed to parse XML" error.

	  There is  the same error when  OpenNebula tries to restore  a vm
	  from a  checkpoint on the  same machine. How  can I fix  this. I
	  need all the machines up and running.

--
ing. Gian Uberto Lauri
Ricercatore / Reasearcher
Laboratorio Ricerca e Sviluppo / Research & Development Lab.
Area Calcolo Distribuito / Distributed Computation Area

GianUberto.Lauri at eng.it

Engineering Ingegneria Informatica spa
Corso Stati Uniti 23/C, 35127 Padova (PD) 

Tel. +39-049.8283.571         |
main(){printf(&unix["\021%six\012\0"],
Fax  +39-049.8283.569		  |    (unix)["have"]+"fun"-0x60);}
Skype: gian.uberto.lauri	  |          David Korn, AT&T Bell Labs
http://www.eng.it 			  |          ioccc best One Liner, 1987

Hello again,

Digging into the source code with my colleague we found out that setting
<script path='no'/> does the trick. But to get this flag
interpreted one
has to select the interface type "ethernet". Otherwise libvirt will
ignore the script element and try to add the tap device to the bridge by
itself.

Unfortunately libvirt does currently not support the downscript
parameter of qemu-kvm. But this only results in a error msg when
shutting down the vm. If I find some time the next days I will try to
produce a patch for this.

Regards,

Christian

Am 16.05.2011 16:39, schrieb Christian Spann:
> Hello,
> 
> I am trying to run a virtual machine with qemu-kvm and libvirt as a
> user. In order to start the virtual machine I setup a tap device
> manually, add it to the bridge and activate it via ifconfig. But I
> cannot tell libvirt to not try to add the definded tap device to the
> bridge by itself. It always fails telling me it cannot add tap0 to br0.
> 
> Thats the xml snippet for defining the network:
> 
> <interface type='bridge'>
> 	<mac address='54:52:00:38:75:dd'/>
> 	<source bridge='br0'/>
> 	<target dev='tap0'/>
> 	<model type='virtio'/>
> </interface>
> 
> Here I would like do define "script=no" to get an output like:
-net
> tap,vlan=0,ifname=tap0,script=no when libvirt launches the vm.
> 
> Regards,
> Christian
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 5765 bytes
Desc: S/MIME Cryptographic Signature
URL:
<http://listman.redhat.com/archives/libvirt-users/attachments/20110517/5acbd5b9/attachment.p7s>