If you are running devstack it creates a screen session for all the services and it contains the logs. Try running "screen -x" to attach to the screen session and you can view the logs from there. Each window within the screen session is a separate service running.
If you had an issue creating an instance from trove it maybe because the image you are using is not setup correctly for trove because it needs the trove guest agent installed and a configuration for the guest agent baked in the image.
We have a repo that uses devstack to create a development trove installation that might be of use to test things out. This readme should help getting you started.
https://github.com/openstack/trove-integration/blob/master/README.md