Hi Osier, The debug log from virt-manager wasn't that helpful. [Thu, 02 Jun 2011 11:32:26 virt-manager 5104] DEBUG (engine:496) Starting vm 'rpmbuilderbase'. [Thu, 02 Jun 2011 11:32:37 virt-manager 5104] DEBUG (error:76) Uncaught Error: Error starting domain: internal error Domain rpmbuilderbase didn't show up : Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 498, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 573, in startup self.vm.create() File "/usr/lib64/python2.4/site-packages/libvirt.py", line 287, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error Domain rpmbuilderbase didn't show up The log in /var/log/libvirt/qemu is a little bit more useful but I don't really understand it. Can someone please explains it to me? LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin HOME=/ /usr/libexec/qemu-kvm -S -M pc -m 2048 -smp 1 -name rpmbuilderbase -uuid bb226766-a712-8e31-74ed-1f971d6a8230 -monitor pty -pidfile /var/run/libvirt/qemu//rpmbuilderbase.pid -boot cc -drive file=/var/lib/libvirt/devmappings/rpmbuilderbase,if=ide,index=0,boot=on -net nic,macaddr=54:52:00:68:ea:d0,vlan=0,model=e1000 -net tap,fd=15,script=,vlan=0,ifname=vnet0 -serial pty -parallel none -usb -vnc <a href="http://127.0.0.1:0">127.0.0.1:0</a> -k en-us Boot device 'c' was given twice Is the message "Boot device 'c' was given twice' a fatal error? If so what is the correct action to resolve the issue? Thanks! David <div class="gmail_quote"> On Wed, Jun 1, 2011 at 11:33 PM, Osier Yang <<a href="mailto:jyang@redhat.com">jyang@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> <div><div></div><div class="h5">On 06/02/2011 07:17 AM, Chun Tat David Chu wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi All, I am new using libvirt. I kept on getting the following error when I try to start my VM. Can anyone give me any suggestion on what could went wrong? Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/engine.py", line 498, in run_domain vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 573, in startup self.vm.create() File "/usr/lib64/python2.4/site-packages/libvirt.py", line 287, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error Domain mytest didn't show up Thanks, David </blockquote> </div></div> virt-manager has debug log, ~/.virt-manager/virt-manager.log. And you can check libvirtd log too, by default, it's /var/log/messages, change "log_outputs" in /etc/libvirt/libvirtd.conf if you want it logs somewhere else. Change the "log_level" in /etc/libvirt/libvirtd.conf if you want to see more log. Perhaps detailed log will help you find out the problem. Regards Osier </blockquote></div>