Restarting the Services

The appropriate services must be restarted so that the changes to the configuration files take effect.

Neutron

Restart neutron-server on each node running it. The exact command may vary based upon your distribution. In Ubuntu, the command is as follows:
$ sudo service neutron-server restart

Nova

If you modified the Nova notification settings, you must restart the Nova Compute service on each node running it. The exact command may vary based on your distribution. In Ubuntu, the command is as follows:
$ sudo service nova-compute restart