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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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