The Ceilometer command-line client tool is critical when troubleshooting this service. It is often the quickest way to test and identify issues within the service. Typing ceilometer help in the terminal will give you a list of the available commands. While covering all the Ceilometer commands is beyond the scope of this book, the commands that follow will aid your troubleshooting process.
The meter list command will allow you to see each of the meters tracked by Ceilometer. This command is also a good way to confirm that Ceilometer is working as expected. Errors or empty values returned from this command are clues to issues with the service or its configuration. When Ceilometer is working as expected, the meter-list command will return one or more meters, as shown in the following screenshot:
If your meter list is empty, there are several troubleshooting steps that you should take. I recommend that you start with Glance and confirm whether Ceilometer...