3.6 KiB
Glossary
- agent
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Software service running on the OpenStack infrastructure measuring usage and sending the results to the
collector. - alarm
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An action triggered whenever a meter reaches a certain threshold.
- API server
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HTTP REST API service for ceilometer.
- ceilometer
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From Wikipedia1:
A ceilometer is a device that uses a laser or other light source to determine the height of a cloud base.
- central agent
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Software service running on a central management node within the OpenStack infrastructure measuring usage and sending the results to the
collector. - collector
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Software service running on the OpenStack infrastructure monitoring notifications from other OpenStack components and samples from the ceilometer agent and recording the results in the database.
- compute agent
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Software service running on a compute node within the OpenStack infrastructure measuring usage and sending the results to the
collector. - data store
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Storage system for recording data collected by ceilometer.
- meter
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The measurements tracked for a resource. For example, an instance has a number of meters, such as duration of instance, CPU time used, number of disk io requests, etc. Three types of meters are defined in ceilometer: * Cumulative: Increasing over time (e.g. disk I/O) * Gauge: Discrete items (e.g. floating IPs, image uploads) and fluctuating values (e.g. number of Swift objects) * Delta: Incremental change to a counter over time (e.g. bandwidth delta)
- notification
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A message sent via an external OpenStack system (e.g Nova, Glance, etc) using the Oslo notification mechanism2. These notifications are usually sent to and received by Ceilometer through the notifier RPC driver.
- non-repudiable
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From Wikipedia3:
Non-repudiation refers to a state of affairs where the purported maker of a statement will not be able to successfully challenge the validity of the statement or contract. The term is often seen in a legal setting wherein the authenticity of a signature is being challenged. In such an instance, the authenticity is being "repudiated".
- project
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The OpenStack tenant or project.
- resource
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The OpenStack entity being metered (e.g. instance, volume, image, etc).
- sample
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Data sample for a particular meter.
- source
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The origin of metering data. This field is set to "openstack" by default. It can be configured to a different value using the sample_source field in the ceilometer.conf file.
- user
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An OpenStack user.