64ffa54c44
The displayed text was "( ceilometer..." with an extra space, fix it. Also add a missing closing brace. Change-Id: I2706ca10bcb6c1c06a6177e2e71603cf2b732bd0
87 lines
3.7 KiB
XML
87 lines
3.7 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
|
|
xml:id="metering-service">
|
|
<title>Metering/Monitoring Service</title>
|
|
<para>The Metering Service is designed to:</para>
|
|
<para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>Efficiently collect the metering data about the CPU
|
|
and network costs.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Collect data by monitoring notifications sent from
|
|
services or by polling the infrastructure.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Configure the type of collected data to meet various
|
|
operating requirements. Accessing and inserting the
|
|
metering data through the REST API.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Expand the framework to collect custom usage data by
|
|
additional plug-ins.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>Produce signed metering messages that cannot be
|
|
repudiated.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</para>
|
|
<para>The system consists of the following basic
|
|
components:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>A compute agent (<systemitem class="service"
|
|
>ceilometer-agent-compute</systemitem>). Runs on each
|
|
compute node and polls
|
|
for resource utilization statistics. There may be other
|
|
types of agents in the future, but for now we will focus
|
|
on creating the compute agent.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>A central agent (<systemitem class="service"
|
|
>ceilometer-agent-central</systemitem>). Runs on a central
|
|
management server
|
|
to poll for resource utilization statistics for resources
|
|
not tied to instances or compute nodes.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>A collector (<systemitem class="service"
|
|
>ceilometer-collector</systemitem>). Runs on one or more
|
|
central management
|
|
servers to monitor the message queues (for notifications
|
|
and for metering data coming from the agent). Notification
|
|
messages are processed and turned into metering messages
|
|
and sent back out onto the message bus using the
|
|
appropriate topic. Metering messages are written to the
|
|
data store without modification.</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>An alarm notifier (<systemitem class="service"
|
|
>ceilometer-alarm-notifier</systemitem>). runs on one or more
|
|
central management servers to allow settting alarms based on
|
|
threshold evaluation for a collection of samples.
|
|
</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>A data store. A database capable of handling
|
|
concurrent writes (from one or more collector instances)
|
|
and reads (from the API server).</para>
|
|
</listitem>
|
|
<listitem>
|
|
<para>An API server (<systemitem class="service"
|
|
>ceilometer-api</systemitem>). Runs on one or more central
|
|
management
|
|
servers to provide access to the data from the data store.
|
|
These services communicate using the standard OpenStack
|
|
messaging bus. Only the collector and API server have
|
|
access to the data store.</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
<para>These services communicate by using the standard OpenStack
|
|
messaging bus. Only the collector and API server have access
|
|
to the data store.</para>
|
|
</section>
|