--- /dev/null
+#
+# You may override the following variables to customize ovn-controller behavior:
+#
+# OVS_DB - Set this variable to the location of the ovsdb server that is
+# serving the Open_vSwitch database for the local ovs-vswitchd.
+# See the manpage for ovn-controller for more details on the
+# format for the db location.
+#
+
+[Unit]
+Description=OVN controller daemon
+After=syslog.target
+Requires=openvswitch.service
+After=openvswitch.service
+
+[Service]
+Type=simple
+Environment=OVS_RUNDIR=@RUNDIR@
+Environment=OVS_DB=unix:@RUNDIR@/db.sock
+ExecStart=/usr/bin/ovn-controller -vconsole:emer -vsyslog:err -vfile:info \
+ --log-file=/var/log/openvswitch/ovn-controller.log \
+ --no-chdir --pidfile=${OVS_RUNDIR}/ovn-controller.pid ${OVS_DB}