Managing OpenStack daemons

If we are using an operating system with the systemd init system, we can easily use the systemctlcommand to start, stop, or check the status of any OpenStack daemons running on a particular server.

For example, to check the status of the nova-api service, we can run the following command:

$ sudo systemctl status nova-api

We should see output similar to Figure 10.5.

Figure 10.5: Output from the systemctl status command

This shows us that the nova-api service is currently running and will be started on reboot (enabled).If the service was stopped, we could easily start it back up by running the following:

$ sudo systemctl start nova-api

If we want to restart a service, we can run the following:

$ sudo systemctl restart nova-api

Note

The exam does not require you to edit any specific OpenStack configuration files—but a good rule of thumb for live OpenStack environments is to remember to restart the service any time you want new changes to configuration files to be applied.