-/usr/bin/docker exec $CID supervisorctl stop ovsdb-server
-/usr/bin/docker exec $CID supervisorctl start ovsdb-server-vtep
-/usr/bin/docker exec $CID ovs-vsctl add-br br-vtep
-/usr/bin/docker exec $CID ovs-vsctl add-port br-vtep eth0
-/usr/bin/docker exec $CID vtep-ctl add-ps br-vtep
-/usr/bin/docker exec $CID vtep-ctl add-port br-vtep eth0
-/usr/bin/docker exec $CID vtep-ctl set Physical_Switch br-vtep tunnel_ips=192.168.254.20
-/usr/bin/docker exec $CID vtep-ctl set-manager ptcp:6640
+/usr/bin/docker exec "$CID" supervisorctl stop ovsdb-server
+/usr/bin/docker exec "$CID" supervisorctl start ovsdb-server-vtep
+/usr/bin/docker exec "$CID" ovs-vsctl add-br br-vtep
+/usr/bin/docker exec "$CID" ovs-vsctl add-port br-vtep eth0
+/usr/bin/docker exec "$CID" vtep-ctl add-ps br-vtep
+/usr/bin/docker exec "$CID" vtep-ctl add-port br-vtep eth0
+/usr/bin/docker exec "$CID" vtep-ctl set Physical_Switch br-vtep tunnel_ips=192.168.254.20
+/usr/bin/docker exec "$CID" vtep-ctl set-manager ptcp:6640