Re: [libvirt] Re: Libvir Xen and domain events
Daniel,
Thanks for the fast response.
I have actually tried the script you were referring too, and it was
actually the basis of my tests. I can't get the script to function
either:
[root@node1 pyper]# python
Python 2.4.3 (#1, Jul 27 2009, 17:56:30)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type "help", "copyright", "credits" or "license"
for more information.
>> import libvirt
>> vc = libvirt.open('xen:///')
>> vc.getFreeMemory()
7521595392L
>> vc.listDomainsID()
[0, 4, 33, 44, 46, 47, 48]
>>
[root@node1 pyper]# ./event-test.py xen:///
Using uri:xen:///
Traceback (most recent call last):
File "./event-test.py", line 93, in myRemoveHandle
mypoll.unregister(h_fd)
KeyError: 0
Traceback (most recent call last):
File "./event-test.py", line 93, in myRemoveHandle
mypoll.unregister(h_fd)
KeyError: 0
Traceback (most recent call last):
File "./event-test.py", line 93, in myRemoveHandle
mypoll.unregister(h_fd)
KeyError: 0
.
.
.
.
Although, it does run fine with the default URI of qemu:///, it does
not catch any events when I test. The physical server I am testing on
works great, and has many virtual domains running on it. I am able to
use -- and have used -- Libvirt every way imaginable to manipulate
those virtual domains. Everything works fine with the Libvirt Python
API and Xen, with the exception of event handling.
Cheers.
Chris Pyper
On 2009-10-12, at 7:29 AM, Daniel P. Berrange wrote:
On Fri, Oct 09, 2009 at 06:46:40PM -0400, Christopher Pyper wrote:
> I have been looking into registering some domain events though the
> python Libvir API. However, I am getting errors and I believe it may
> be due to lack of event support in Xen. This is the error I am
> getting:
>
> libvir: Xen error : this function is not supported by the hypervisor:
> xenUnifiedDomainEventRegister
> Traceback (most recent call last):
> File "./testcallback.py", line 19, in ?
> conn.domainEventRegister(callback,None)
> File "/usr/lib64/python2.4/site-packages/libvirt.py", line 1578, in
> domainEventRegister
> if ret == -1: raise libvirtError ('virConnectDomainEventRegister
> () failed', conn=self)
> libvirt.libvirtError: this function is not supported by the
> hypervisor: xenUnifiedDomainEventRegister
The Xen driver does support events. I think this is probably a
misleading
error message which in fact is trying to tell you that you need to
provide
an event loop first.
Take a look at examples/domain-events/events-py.py for a good example
of how to use events. I've not tested it with Xen recently, but it
ought
to work
Daniel
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