root@controller:~# service neutron-metadata-agent restart
root@controller:~# service neutron-metadata-agent status
● neutron-metadata-agent.service - OpenStack Neutron Metadata Agent
    Loaded: loaded (/lib/systemd/system/neutron-metadata-agent.service; enabled;
vendor preset: enabled)
    Active: active (running) since Tue 2016-05-31 22:08:16 KST; 4s ago
   Process: 17136 ExecStartPre=/bin/chown neutron:neutron /var/lock/neutron /var/
log/neutron /var/lib/neutron (code=exited, status=0/SUCCESS)
   Process: 17132 ExecStartPre=/bin/mkdir -p /var/lock/neutron /var/log/neutron /
var/lib/neutron (code=exited, status=0/SUCCESS)
  Main PID: 17140 (neutron-metadat)
     Tasks: 3
    Memory: 94.3M
       CPU: 895ms
    CGroup: /system.slice/neutron-metadata-agent.service
            ├─17140 /usr/bin/python /usr/bin/neutron-metadata-agent –config-file=/
etc/neutron/neutron.conf –config-file=/etc/neutron/metadata_agent.ini –log-file=/
var/log/neutron/neutron-metadata-agent.log
            ├─17153 /usr/bin/python /usr/bin/neutron-metadata-agent –config-file=/
etc/neutron/neutron.conf –config-file=/etc/neutron/metadata_agent.ini –log-file=/
var/log/neutron/neutron-metadata-agent.log
            └─17154 /usr/bin/python /usr/bin/neutron-metadata-agent –config-file=/
etc/neutron/neutron.conf –config-file=/etc/neutron/metadata_agent.ini –log-file=/
var/log/neutron/neutron-metadata-agent.log