ethtool Prometheus metrics

[Hemedi Salim]

Hi.

I am still learning and new in this monitoring field. 

at the moment am using node-exporter to get metric to prometheus, but the node-exporter am using is not provide the metrics with comes from ethtool, the like of:

-rx/tx queue

-Laser output power              

-Receiver signal average optical power    

 -Module temperature        

Is there any exporter or  way of  getting these metrics (ethtool metric) to prometheus and display in grafana? 

Please help.

                

[Brian Candler]

I guess it's data from "ethtool -m" that you're interested in?

node_exporter already has an ethtool collector, although it's disabled by default (add "--collector.ethtool" to the command line to enable it). It only gives data from "ethtool", "ethtool -S" and "ethtool -i", but at least that gives you rx/tx queue information you wanted.  I think it would be a reasonable feature request to handle "ethtool -m" as well.

Googling "prometheus node_exporter ethtool" gives this as the first hit:

https://github.com/Showmax/prometheus-ethtool-exporter

Looking at the source, it does appear to collect ethtool -m. It only retains certain metrics, but they include the ones you listed.  It should be easy enough to modify if necessary.

Failing that, you can write a cronjob which parses ethtool output and writes to a metrics file that the node_exporter textfile collector can pick up.

[Hemedi Salim]

Hi Brian, 

Thanks very much. and I am very interested in the last line of your answer, I think that would do for a short time, while I am looking for a permanent solution. 

I can write the cronjob with no problem at all, but how to parse the output to the metrics file that the node_exporter textfile collector can pick up, I do not know how. Please if possible can you give me a bit of hint on where the path to that file or how the output is exactly passed to the metric file to be collected with node_exporter, I will appreciate it.

please help

Thanks

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[Brian Candler]

The path [to a directory] is whatever you pass to node_exporter when you start it: e.g.

/opt/node_exporter/node_exporter --collector.textfile.directory=/var/lib/node_exporter

Then all files /var/lib/node_exporter/*.prom will be picked up.

There are lots of examples of scripts which write metrics for textfile collector in this repository:

https://github.com/prometheus-community/node-exporter-textfile-collector-scripts