Can you unstack, check all virutualization components are installed (libvirt server, kvm, qemu) as in this bug https://bugs.launchpad.net/nova/+bug/... and then stack again.

You need to have availability zones to launch VMs.

A quick check, see whether nova compute (n-cpu) is running by clicking on "system info" of Admin panel. If you are using ubutu, follow this bug link.

Thanks.

If you are using devstack, you can use the localrc for the present though the local.conf is recommended. As for the log stuff, if you did not specify the SCREEN_LOG env variable in localrc all logs will remain in screen session, you can check them by login into the screen

cd devstack
./rejoin-stack.sh

Please check every service in the screen make sure they are running without any error then provision instance again and check the nova-scheduler screen window to see if any error occured.

Hope that helps.

Vic