We are seeing a different issue on queens https://logs.rdoproject.org/24/567224/108/openstack-check/legacy-tripleo-ci-centos-7-ovb-3ctlr_1comp-featureset001-queens/eb39d51/logs/undercloud/var/log/ironic-inspector/ironic-inspector.log.txt.gz#_2018-09-18_00_58_25_777

018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base [-] The PXE filter DnsmasqFilter, state=initialized encountered an exception: Unexpected error while running command.
Command: sudo ironic-inspector-rootwrap /etc/ironic-inspector/rootwrap.conf systemctl start openstack-ironic-inspector-dnsmasq.service
Exit code: 99
Stdout: u''
Stderr: u'/usr/bin/ironic-inspector-rootwrap: Unauthorized command: systemctl start openstack-ironic-inspector-dnsmasq.service (no filter matched)\n'; resetting the filter: ProcessExecutionError: Unexpected error while running command.
Command: sudo ironic-inspector-rootwrap /etc/ironic-inspector/rootwrap.conf systemctl start openstack-ironic-inspector-dnsmasq.service
Exit code: 99
Stdout: u''
Stderr: u'/usr/bin/ironic-inspector-rootwrap: Unauthorized command: systemctl start openstack-ironic-inspector-dnsmasq.service (no filter matched)\n'
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base Traceback (most recent call last):
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base   File "/usr/lib/python2.7/site-packages/ironic_inspector/pxe_filter/base.py", line 139, in fsm_reset_on_error
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base     yield self.fsm
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base   File "/usr/lib/python2.7/site-packages/ironic_inspector/pxe_filter/base.py", line 81, in inner
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base     return method(self, *args, **kwargs)
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base   File "/usr/lib/python2.7/site-packages/ironic_inspector/pxe_filter/dnsmasq.py", line 141, in init_filter
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base     _execute(CONF.dnsmasq_pxe_filter.dnsmasq_start_command)
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base   File "/usr/lib/python2.7/site-packages/ironic_inspector/pxe_filter/dnsmasq.py", line 313, in _execute
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base     check_exit_code=not ignore_errors)
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base   File "/usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py", line 424, in execute
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base     cmd=sanitized_cmd)
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base ProcessExecutionError: Unexpected error while running command.
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base Command: sudo ironic-inspector-rootwrap /etc/ironic-inspector/rootwrap.conf systemctl start openstack-ironic-inspector-dnsmasq.service
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base Exit code: 99
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base Stdout: u''
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base Stderr: u'/usr/bin/ironic-inspector-rootwrap: Unauthorized command: systemctl start openstack-ironic-inspector-dnsmasq.service (no filter matched)\n'
2018-09-18 00:58:25.777 1746 ERROR ironic_inspector.pxe_filter.base 


Note it might be related to RDO Ovb compute node issue