On 02/28/2013 01:09 AM, Qinghua Cheng wrote: > Hi Experts, > > I have libvirt 1.0.2 downloaded and build on my RH. And I also > downloaded qemu 1.4.0 and build on this machine. > > When I tried to start my VM ubuntu12, get error messages: > > error: Failed to start domain ubuntu12 > error: internal error Process exited while reading console log output: > > I have no idea what does this message mean. Could you please help point > out what I should do next? Have you looked in /var/log/libvirt/qemu/ubuntu12.log, to see if there is a more details error message? Are you sure you installed your self-built binaries in the same place that the distro versions live, or could there be any mismatch? Does http://wiki.libvirt.org/page/Troubleshooting help? (and that's a wiki, so if you don't see your problem listed, feel free to add a page to help others learn what you learn in this exercise) You mentioned that your host machine is running Red Hat - have you tried to use your Red Hat support contract for the feature that you want from the version that the distro ships? (Of course, installing a self-built binary in place of distro binary puts you in unsupported territory, no matter what distro you use...)