[libvirt-users] libvirt connections

[brandlk at mathematik.uni-marburg.de]

>> - I want to close all libvirt connections at the end, but closing the
>> connections does not close the ssh - nc connections libvirt opens in the
>> background to talk to the hypervisor. I have to manually delete all
>> domain
>> objects as well to get the pending ssh - nc connections closed. I can
>> keep
>> on using the domain object, even if I closed the connection before.
>> Is this behaviour intended?
>
> This behavior is intended. Connection and domain objects are
> refcounted. If you open a connection conn it starts with a refcount of
> 1. When you request a domain object using conn, then the refcount of
> that connection is increased by 1. Upon destruction of the domain
> object the refcount of conn is decreased again by 1.
>
> Now if you call close on conn or get rid of the python reference by
> assigning None to conn, then the connection is not closed immediately,
> only the refcount is decreased by 1. The connection gets closed when
> its refcount reaches zero. This happens if you close the connection
> _and_ free all domain, network, interface objects etc. that you
> requested using that connection.

Thx. If you know how it works, it's ok :)
What about the other issue?

>> - if the hypervisor is not running, libvirt.open("xen+ssh://host")
>> doesn't
>> time out put keeps trying to connect to host on port 8000.
>> I've tried with the following test program:
>>
>> try:
>> Â  conn = libvirt.open("xen+ssh://host")
>> except:
>> Â  print "failed"
>> Â  sys.exit(1)
>>
>> However: after aborting the program with Ctrl-C I get the exception.
>>

K. Haselhorst