root@node02:~# systemctl status neutron-linuxbridge-agent
● neutron-linuxbridge-agent.service - neutron openstack service
   Loaded: loaded (/etc/systemd/system/neutron-linuxbridge-agent.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-02-07 15:31:02 EST; 640ms ago
 Main PID: 8940 (neutron-linuxbr)
    Tasks: 1
      CPU: 637ms
   CGroup: /neutron.slice/neutron-linuxbridge-agent.service
           └─8940 /openstack/venvs/neutron-16.0.6/bin/python /openstack/venvs/neutron-16.0.6/bin/neutron-linuxbridge-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/

Feb 07 15:31:02 node02 systemd[1]: Started neutron openstack service.
Feb 07 15:31:02 node02 neutron-linuxbridge-agent[8940]: Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward compatibility. SIGUSR1 will no longer be registered in a future release,
root@node02:~# systemctl status neutron-linuxbridge-agent
● neutron-linuxbridge-agent.service - neutron openstack service
   Loaded: loaded (/etc/systemd/system/neutron-linuxbridge-agent.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Wed 2018-02-07 15:31:04 EST; 210ms ago
  Process: 8940 ExecStart=/openstack/venvs/neutron-16.0.6/bin/neutron-linuxbridge-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini --config-file /etc/neu
 Main PID: 8940 (code=exited, status=1/FAILURE)

Feb 07 15:31:04 node02 systemd[1]: neutron-linuxbridge-agent.service: Unit entered failed state.
Feb 07 15:31:04 node02 systemd[1]: neutron-linuxbridge-agent.service: Failed with result 'exit-code'.
root@node02:~#