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Mastering OpenStack - Second Edition by Chandan Dutta Chowdhury, Omar Khedher

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The Ceilometer architecture

The overall workflow of Ceilometer can be highlighted in four main phases that include:

  • Data collection
  • Data processing
  • Data storage
  • Data retrieval

At each stage of the precedent workflow, Ceilometer exposes different dedicated agents designed to facilitate the completion of the whole chain, which can be summarized as the following:

  • Polling agents: These poll regularly each OpenStack infrastructure service to formulate measurements via API calls.
A polling agent can be a wide term that may point to both a compute agent and a central agent. A compute agent specifically gathers statistics from instances running in a compute node and polls them to the message queue. The central agent could run in a central management ...

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