Hi all,
I have reported a bug for nsd at https://bugzilla.redhat.com/show_bug.cgi? id=1096049 for version 3.2.17-1.fc20
nsd does not support a -D option and therefore fails at start. A workaround is to copy the service file to /etc/systemd/system, remove the -D option from the ExecStart line, and change the service type from 'simple' to 'forking'. Then disable the service and re-enable it.
This is a bug that should not have happened and should not have been released into the wild.