I found what it was: there were some incomplete virtual machine configuration 
files in /etc/xen which I'd generated for testing previously. Because they 
weren't complete and their IDs weren't attached to any actual VM, they were 
screwing up any calls to virDomainLookupByName() . Removing them did the trick.

Hope this helps somebody.

Graeme

On 26 Aug 2008, at 09:42, Graeme West wrote:

Sorry to bump my own thread, but does anyone have any ideas about this?

I've now tried virtually every combination of options in virt-manager and 
virt-install, and nothing seems to avoid this error (or let me get beyond the 
networking screen in virt-manager).

Has anyone encountered anything like this before?


Thanks,

Graeme


On 6 Aug 2008, at 09:41, Graeme West wrote:

Hi there,
I've been happily installing VMs in CentOS 5.2's Xen implementation using 
virt-manager. However, my latest attempt to use the install wizard in 
virt-manager failed when I got to the networking screen. The 'forward' button 
was unresponsive, and I was unable to proceed. I checked the virt-manager logs, 
and saw this appearing immediately after I tried to proceed:

/root/.virt-manager/virt-manager.log:

[Tue, 05 Aug 2008 16:16:53 virt-manager 20637] ERROR (virt-manager:132) 
Traceback (most recent call last):
 File "/usr/share/virt-manager/virtManager/create.py", line 294, in forward
   if(self.validate(notebook.get_current_page()) != True):
 File "/usr/share/virt-manager/virtManager/create.py", line 974, in validate
   vm = self.connection.vmm.lookupByName(name)
 File "/usr/lib64/python2.4/site-packages/libvirt.py", line 646, in lookupByName
   if ret is None:raise libvirtError('virDomainLookupByName() failed', 
conn=self)
libvirtError: virDomainLookupByName() failed got unknown HTTP error code 400
None



There was also a lot of this in the main system log (1-2 messages per second):
[Tue, 05 Aug 2008 16:16:53 virt-manager 20637] DEBUG (connection:580) Couldn't 
fetch domain id 3; it probably went away

So I tried to use virt-install on the shell instead, but got much the same 
error:

[EMAIL PROTECTED] swadmin]# virt-install --hvm --name=zurich.gcal.ac.uk 
--ram=2048 --file=/var/lib/xen/images/zurich.gcal.ac.uk.img --vnc --vcpus=2 
--cdrom=/home/swadmin/software/OpenSolaris/sol-nv-b93-x86-dvd.iso 
--network=bridge:xenbr0


Starting install...
virDomainLookupByName() failed got unknown HTTP error code 400
Domain installation may not have been
successful.  If it was, you can restart your domain
by running 'virsh start zurich.gcal.ac.uk'; otherwise, please
restart your installation.
Tue, 05 Aug 2008 17:30:18 ERROR    virDomainLookupByName() failed got unknown 
HTTP error code 400
Traceback (most recent call last):
 File "/usr/bin/virt-install", line 502, in ?
   main()
 File "/usr/bin/virt-install", line 462, in main
   dom = guest.start_install(conscb,progresscb)
 File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 813, in 
start_install
   return self._do_install(consolecb, meter)
 File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 829, in 
_do_install
   self._create_devices(meter)
 File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 727, in 
_create_devices
   nic.setup(self.conn)
 File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 287, in setup
   vm = conn.lookupByName(name)
 File "/usr/lib64/python2.4/site-packages/libvirt.py", line 646, in lookupByName
   if ret is None:raise libvirtError('virDomainLookupByName() failed', 
conn=self)
libvirtError: virDomainLookupByName() failed got unknown HTTP error code 400

It suggests I try to start the domain anyway, but it hasn't been created:
[EMAIL PROTECTED] swadmin]# virsh start zurich.gcal.ac.uk
libvir: Xen error : Domain not found: xenUnifiedDomainLookupByName
error: failed to get domain 'zurich.gcal.ac.uk'


Any ideas would be much appreciated.


Thanks,

Graeme West


Glasgow Caledonian University is a registered Scottish charity, number SC021474

Email has been scanned for viruses by Altman Technologies' email management 
service<http://www.altman.co.uk/emailsystems>

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Glasgow Caledonian University is a registered Scottish charity, number SC021474

Email has been scanned for viruses by Altman Technologies' email management 
service<http://www.altman.co.uk/emailsystems>

<ATT00001.txt>


Glasgow Caledonian University is a registered Scottish charity, number SC021474
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