openstack/openstack-manuals
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Merge "Added information for missing Telemtry services."

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Jenkins 2014-11-27 01:18:20 +00:00 committed by Gerrit Code Review
commit 7a581a70a8
1 changed files with 17 additions and 5 deletions
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22
doc/common/section_getstart_telemetry.xml
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@ -39,7 +39,7 @@
<listitem><para>Runs on each compute node and polls for resource
utilization statistics. There may be other types of agents in the
future, but for now our focus is creating the compute agent.</para>
</listitem>
</listitem>
</varlistentry>
<varlistentry><term>A central agent (<systemitem class="service"
>ceilometer-agent-central</systemitem>)</term>
@ -47,6 +47,12 @@
resource utilization statistics for resources not tied to instances
or compute nodes.</para></listitem>
</varlistentry>
<varlistentry><term>A notification agent (<systemitem class="service"
>ceilometer-agent-notification</systemitem>)</term>
<listitem><para>Runs on a central management server to initiate
alarm actions, such as calling out to a webhook with a description
of the alarm state transition.</para></listitem>
</varlistentry>
<varlistentry><term>A collector (<systemitem class="service"
>ceilometer-collector</systemitem>)</term>
<listitem><para>Runs on central management server(s) to monitor the
@ -55,26 +61,32 @@
metering messages, which are sent to the message bus using the
appropriate topic. Telemetry messages are written to the data store
without modification.</para>
</listitem>
</listitem>
</varlistentry>
<varlistentry><term>An alarm evaluator (<systemitem class="service"
>ceilometer-alarm-evaluator</systemitem>)</term>
<listitem><para>Runs on one or more central management servers to
determine when alarms fire due to the associated statistic
trend crossing a threshold over a sliding time window.</para></listitem>
</varlistentry>
<varlistentry><term>An alarm notifier (<systemitem class="service"
>ceilometer-alarm-notifier</systemitem>)</term>
<listitem><para>Runs on one or more central management servers to
allow alarms to be set based on the threshold evaluation for a
collection of samples.</para></listitem>
</varlistentry>
</varlistentry>
<varlistentry>
<term>A data store</term>
<listitem><para>A database capable of handling
concurrent writes (from one or more collector instances)
and reads (from the API server).</para></listitem>
</varlistentry>
<varlistentry>
<varlistentry>
<term>An API server (<systemitem
class="service">ceilometer-api</systemitem>)</term>
<listitem><para>Runs on one or more central management servers to
provide data access from the data store.</para></listitem>
</varlistentry>
</varlistentry>
</variablelist>
<para>These services communicate by using the OpenStack messaging bus.
Only the collector and API server have access