0e8f2359d9
This changeset is phase one of changing the pollster API to support polling individual instance resources. In this change, the single compute agent is divided into two separate daemons. The compute agent, for polling instance data, is still meant to run on the compute server. The new "central" agent, for polling resources not tied to a compute node, is meant to run on a management server (probably the same place the collector runs). The configuration of the pollsters is updated so that they are loaded by the appropriate agent. New base classes are introduced for each of the types of pollsters. For now, the APIs remain the same. The code implementing the agent and plugins has been moved around to reflect the new logical relationships, and the documentation is updated (including new installation instructions). Change-Id: Ica6e947b2e457f7db6672147af1369a24066037d Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
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Glossary
- agent
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Software service running on the OpenStack infrastructure measuring usage and sending the results to the
collector. - 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 meter events 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.
- non-repudiable
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From WikiPedia2:
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".