$ sg libvirtd '/usr/bin/nova-compute --config-file /etc/nova/nova.conf'
No handlers could be found for logger "oslo_config.cfg"
2015-08-17 11:23:34.841 DEBUG nova.servicegroup.api [-] ServiceGroup driver defined as an instance of db from (pid=14775) __init__ /opt/openstack/nova/nova/servicegroup/api.py:68
2015-08-17 11:23:34.929 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative
2015-08-17 11:23:35.001 DEBUG nova.servicegroup.api [-] ServiceGroup driver defined as an instance of db from (pid=14775) __init__ /opt/openstack/nova/nova/servicegroup/api.py:68
2015-08-17 11:23:35.003 INFO nova.virt.driver [-] Loading compute driver 'nova.virt.libvirt.driver.LibvirtDriver'
2015-08-17 11:23:35.026 CRITICAL nova [-] NoSuchOptError: no such option in group libvirt: rbd_user

2015-08-17 11:23:35.026 TRACE nova Traceback (most recent call last):
2015-08-17 11:23:35.026 TRACE nova   File "/usr/bin/nova-compute", line 10, in <module>
2015-08-17 11:23:35.026 TRACE nova     sys.exit(main())
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/cmd/compute.py", line 72, in main
2015-08-17 11:23:35.026 TRACE nova     db_allowed=CONF.conductor.use_local)
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/service.py", line 277, in create
2015-08-17 11:23:35.026 TRACE nova     db_allowed=db_allowed)
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/service.py", line 148, in __init__
2015-08-17 11:23:35.026 TRACE nova     self.manager = manager_class(host=self.host, *args, **kwargs)
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/compute/manager.py", line 705, in __init__
2015-08-17 11:23:35.026 TRACE nova     self.driver = driver.load_compute_driver(self.virtapi, compute_driver)
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/virt/driver.py", line 1389, in load_compute_driver
2015-08-17 11:23:35.026 TRACE nova     virtapi)
2015-08-17 11:23:35.026 TRACE nova   File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 52, in import_object_ns
2015-08-17 11:23:35.026 TRACE nova     return import_class(import_str)(*args, **kwargs)
2015-08-17 11:23:35.026 TRACE nova   File "/usr/lib/python2.7/site-packages/oslo_utils/importutils.py", line 27, in import_class
2015-08-17 11:23:35.026 TRACE nova     __import__(mod_str)
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/virt/libvirt/__init__.py", line 15, in <module>
2015-08-17 11:23:35.026 TRACE nova     from nova.virt.libvirt import driver
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/virt/libvirt/driver.py", line 97, in <module>
2015-08-17 11:23:35.026 TRACE nova     from nova.virt.libvirt import imagebackend
2015-08-17 11:23:35.026 TRACE nova   File "/opt/openstack/nova/nova/virt/libvirt/imagebackend.py", line 80, in <module>
2015-08-17 11:23:35.026 TRACE nova     CONF.import_opt('rbd_user', 'nova.virt.libvirt.volume', group='libvirt')
2015-08-17 11:23:35.026 TRACE nova   File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2071, in import_opt
2015-08-17 11:23:35.026 TRACE nova     self._get_opt_info(name, group)
2015-08-17 11:23:35.026 TRACE nova   File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2427, in _get_opt_info
2015-08-17 11:23:35.026 TRACE nova     raise NoSuchOptError(opt_name, group)
2015-08-17 11:23:35.026 TRACE nova NoSuchOptError: no such option in group libvirt: rbd_user
2015-08-17 11:23:35.026 TRACE nova