Monitoring & Reporting Tools Flashcards

Which OpenStack service provides an API for querying metering data collected by Ceilometer?

Answer: Gnocchi

Gnocchi is the time-series database service that replaced Ceilometer's storage backend and provides an API for querying metering data.

What command lists all available Ceilometer meters for a specific project?

Answer: ceilometer meter-list --project-id

The 'ceilometer meter-list --project-id ' command lists all meters available for a given project.

In Gnocchi, what is an 'archive policy' used for?

Answer: Setting the granularity and retention period for time-series metrics

An archive policy in Gnocchi defines the granularity (e.g., 5-minute intervals) and retention duration for stored time-series metrics.

Which OpenStack component is specifically responsible for event storage and querying (as opposed to metric/sample storage)?

Answer: Panko

Panko is the OpenStack event storage service, handling discrete events rather than continuous time-series metrics.

When configuring Ceilometer to use Gnocchi as its backend, which configuration file section must be updated on the Ceilometer agent nodes?

Answer: [dispatcher_gnocchi]

The [dispatcher_gnocchi] section in ceilometer.conf must be configured to point Ceilometer at the Gnocchi endpoint.

Which tool can be used to visualize OpenStack Gnocchi metrics with a graphical dashboard?

Answer: Grafana with the Gnocchi datasource plugin

Grafana supports a Gnocchi datasource plugin, allowing administrators to create dashboards visualizing Gnocchi time-series metrics.

What is the purpose of the 'ceilometer-polling' agent in an OpenStack deployment?

Answer: It periodically polls resources via the OpenStack APIs to collect metrics

The ceilometer-polling agent periodically queries OpenStack APIs (Nova, Cinder, etc.) to collect resource utilization metrics.