<div class="gmail_quote">On Wed, Jan 13, 2010 at 2:39 AM, Daniel P. Berrange <<a href="mailto:berrange@redhat.com">berrange@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="im">On Tue, Jan 12, 2010 at 04:06:32PM -0800, su disheng wrote: > Hi, > In the following libvirt API calling sequence, I always get an error "no > domain with matching uuid" > Connect _conn = new Connect("qemu:///system", false); > _conn.domainDefineXML(kvm_guest_xml); > Domain dm = _conn.domainLookupByName(kvm_guest_name); > dm.create(); > > /* stop, undefine, and re-start the vm*/ > dm.shutdown(); > dm.undefine(); > dm.domainDefineXML(kvm_guest_xml); > /****A****/ > Domain dm = _conn.domainLookupByName(kvm_guest_name); > dm.create() /********Error!!!!**/ > > if I close the connection, and re-connect qemu at the end of > /****A****/, then everything is OK. </div>I think the first 'dm' object you create is not being freed / garbage collected. This means the underlying libvirt virDomainPtr object is not released. And so when you then _conn.domainLookupByName() after '****A****' you are still getting an handle to the old object and thus the stale UUID. <div class="im"> </div></blockquote><div> Hmm, got it. If free all the returned virDomainPtr, then the issue is gone. One frustrated thing is that the API virDomainDefineXML, which returns a virDomainPtr, I need to explicitly free it, even I don't reference it after that function call... Got me crazy to debug it. Maybe it's better to mention it in the API reference? Another thing is "/* TODO search by UUID first as they are better differenciators */" in virGetDomain, if libvirt does what it said here, my issue will not be an issue again, right? </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="im"> > From the log, seems that uuid is not updated immediately, for this > connection, the uuid is in the stale state? > I am using libvirt 0.6.3, if it's a bug, does it fixed in the latest > code? or Have I need to close the connection for each vm shutdown/re-define? </div>You should not need to close the connection, provided you ensure all the 'Domain' objects are freed/garbage collected Alternatively, if you wish to re-use the same name,then you could try auto-generating the UUID yourself, so you use the same UUID when defining the domain for the second time Daniel -- |: Red Hat, Engineering, London -o- <a href="http://people.redhat.com/berrange/" target="_blank">http://people.redhat.com/berrange/</a> :| |: <a href="http://libvirt.org" target="_blank">http://libvirt.org</a> -o- <a href="http://virt-manager.org" target="_blank">http://virt-manager.org</a> -o- <a href="http://ovirt.org" target="_blank">http://ovirt.org</a> :| |: <a href="http://autobuild.org" target="_blank">http://autobuild.org</a> -o- <a href="http://search.cpan.org/%7Edanberr/" target="_blank">http://search.cpan.org/~danberr/</a> :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| </blockquote></div>