The check plugin check_linux_sensors monitors the hardware sensors via libsensors:

  • alarms
  • current
  • energy
  • fan RPM
  • humidity
  • power
  • temperature
  • voltage


  • a Linux OS on bare metal
  • libsensors(3)


The plug-and-play Linux binaries don't take any CLI arguments or environment variables.

As the plugin uses libsensors, it respects the configuration in sensors.conf(5).

Legal info

To print the legal info, execute the plugin in a terminal:

$ ./check_linux_sensors

In this case the program will always terminate with exit status 3 ("unknown") without actually checking anything.


If you want to actually execute a check inside a terminal, you have to connect the standard output of the plugin to anything other than a terminal – e.g. the standard input of another process:

$ ./check_linux_sensors |cat

In this case the exit code is likely to be the cat's one. This can be worked around like this:

bash $ set -o pipefail
bash $ ./check_linux_sensors |cat

Actual monitoring

Just integrate the plugin into the monitoring tool of your choice like any other check plugin. (Consult that tool's manual on how to do that.) It should work with any monitoring tool supporting the Nagio$ check plugin API.

The only limitation: check_linux_sensors must be run on the host to be monitored – either with an agent of your monitoring tool or by SSH. Otherwise it will monitor the host your monitoring tool runs on.

Icinga 2

This repository ships the check command definition as well as a service template and host example for Icinga 2.

The service definition will work in both correctly set up Icinga 2 clusters and Icinga 2 instances not being part of any cluster as long as the hosts are named after the endpoints.