mdchambers / freenas_exporter

My attempt at a custom exporter for Prometheus that works on FreeNAS

FreeNAS Custom Exporter

8/1/18 - I got it working! The script, however basic, now reports the temperatures of the CPUs. It does this by pulling from IPMI. While this has already been done to better effect in the IPMI exporter, this was a learning challenge for me and a start to a custom FreeNAS exporter which I hope to build up and modify to the request of the community. As a VM with HBA passed through to it, FreeNAS is, in my admittedly inexperienced belief, the best place to put and build a custom exporter for both the system and drive temps, and later more.

6/8/18 - I got some really helpful feedback here https://groups.google.com/forum/#!topic/golang-nuts/0o7jMAXPBiE and am incorporating that now. I also am reducing the test file greatly, but the past testing should be in the file history so it is not lost.

6/7/18 - As of now I have the first part of the command working, but I don't think the piping works within the exec.Command() creation. Judging from the example on gobyexample.com for exec'ing processes, I may need to use the command's standard out, in, and error to manipulate the data appropriately. It may also be wise to use something besides grep and awk which I am sure are available within Go's standard libraries. At this point I feel like I have forgotten part of the class I took and or just need to invest in a book and relearn a bit, specifically on the reader and reader implementing packages.

I am trying to create a custom exporter for use in FreeNAS as the node_exporter does not send the correct CPU temperature (currently). You may find my troubleshooting in these, and a few other, links: https://groups.google.com/forum/#!topic/prometheus-users/MjA77maIz5o prometheus/node_exporter#945

This will be the base code. Once I get this working I hope to add in temp metrics for the drives, then anything else I or the FreeNAS community wishes. I have a working shell script for the temperatures and know the FreeNAS community has quite a few more scripts that can be translated over to Go or to otherwise work with Prometheus for a more sophisticated/fun monitoring system. Any guidance, advice, etc you have is welcome. All questions welcome too!

Status: Compiles, I believe with dependencies, but does not run as descriped in the google groups thread. Not sure what is missing, but I will keep playing around with it.

Credit for much of the work goes to: https://rsmitty.github.io/Prometheus-Exporters/, https://www.robustperception.io/setting-a-prometheus-counter/, and looking at the node_xporter of Prometheus, specifically cpu_freebsd

[16:39] <Nikon_NLG[m]> maelos: Don't you check if you have some specific flag for kernel, and you'll have correct temperature for your MB/CPU ?

Renamed this to custom exporter and fixed a few things