Ceilometer dependencies
Ceilometer has a few external dependencies that troubleshooters need to be familiar with. Like the other OpenStack services, Ceilometer makes heavy use of the message broker. In most installations, the message broker will be RabbitMQ. Ceilometer will read events and notifications from the message queue, and translate that data into meters. In addition, Ceilometer relies on a database to store all the meters, events, notifications, and so on. The recommended database for Ceilometer is MongoDB. Ceilometer introduces the MongoDB noSQL database, while most other OpenStack projects use a relational database, such as MySQL. When troubleshooting Ceilometer, you want to make sure that each of these dependencies are in good working ...
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