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<p class="MsoNormal">>>I know that ceilometer may be an option, but I believe operators use all kind of tools for their own ressource usage monitoring. So what do you people use?<o:p></o:p></p>
<p class="MsoNormal">>><br>
>>(For this use case, we're looking for something that can be used without installing an agent in the VM, which makes it impossible to get a VM's load metric. I would be satisfied with cpu/memory/network/io metrics though.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Although I’d like to re-evaluate ceilometer at some point we currently use something very simple with the infra we already had in place.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We use the collectd libvirt plugin and push the metrics to graphite.<o:p></o:p></p>
<p class="MsoNormal"><a href="https://collectd.org/wiki/index.php/Plugin:virt">https://collectd.org/wiki/index.php/Plugin:virt</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If you use the following format you get the instance uuid in the metric name:
<o:p></o:p></p>
<p class="MsoNormal">HostnameFormat "hostname uuid"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The output of those graphite keys is not exactly what we want (IIRC you get hostname_uuid instead of hostname.uuid)
<o:p></o:p></p>
<p class="MsoNormal">We rewrite it a bit with carbon-(c-)relay daemon to something more usable so you get:<o:p></o:p></p>
<p class="MsoNormal">computenode.libvirt.UUID.metrics<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We made a grafana dashboard where you can select the uuid and get the stats of the instance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Pros: <o:p></o:p></p>
<p class="MsoNormal">* Simple, just needs collectd on compute nodes<o:p></o:p></p>
<p class="MsoNormal">* Graphite scales (with the proper setup)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cons:<o:p></o:p></p>
<p class="MsoNormal">* No tenant-id in the metric name (I guess with some scripting you can make a mapping-tree in graphite)<o:p></o:p></p>
<p class="MsoNormal">* No metrics in Horizon. (We still have to make some time to integrate these metrics into horizon but that should be doable.)<o:p></o:p></p>
<p class="MsoNormal">* Just instance metrics nothing else<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal">Robert van Leeuwen<o:p></o:p></p>
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