On Tue, Nov 01, 2011 at 10:59:39AM +0800, Jiff Shen wrote:

Hi,

We are using Ubuntu 10.04 eucalyptus 1.6.2 and libvirt 0.7.5. We found eucalyptus-nc sometimes hangs in virDomainCreateXML, and never gets response from libvirtd. After 2 days of investigation, I found there is another libvirt client connects to libvirtd 'qemu:///system', which is the same URI as eucalyptus-nc. The bug never shows after I disabled the client.

My question is: 1, can I have multiple clients connect to qemu:///system?

Yes, since 0.6.0 we support concurrent connections, however, there have been releases where this is buggy. Also one thread may still block another thread if it holds a lock for a long time.

2, is this an bug in libvirt and has it been fixed?

I can't remember an specific bug in that libvirt release, but it is quite old now. You might consider trying a newer libvirt. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|