Using command_line sensor on host

I’m trying to set up a command_line sensor for monitoring the hardrive temperature on the host of
I’m running Hass.Io on a Intel NUC running Debian.

  - platform: command_line
    name: HDD Temp
    command: "smartclt -A /dev/sdb | grep Temperature_Celcius | awk '{print $10}'"
    unit_of_measurement: "°C"

But it’s not working at all.
How does command_line sensor and shell_command work when HassIO runs in this way?
I’m thinking that I maybe need to ssh from the hassio container to the host operating system and then run the command?
Any ideas?

1 Like

I’m using shell scripts via cron to publish values to mqtt on local or remote hosts.
In HA i show the values with the MQTT Sensor

What does your log say?
I’m not familiar with smartctl command. Any chance it requires su privileges?
Alternatively I’ve personally taken the same approach as @VDRainer

When I run the smartctl command from debian host I have to use sudo yes.
I could try to disable the sudo password and see if “sudo smartctl …” works.

Otherwise I think I will try @VDRainer and yours solution with cron and MQTT, sounds neat.

Not luck with using sudo and disabling sudo password on the host.
I guess I have to go with cronjob+mqtt solution.

But I still would like to understand how to get command_line sensor to work on HassIO!

I managed to get it working at last!

Basicly I set up an ssh connection from the home assistant docker container to the host system. Followed this guide,, except for the first part as I’m running on a NUC through debian and already have access to the operating system.

This is final configuration:

  - platform: command_line
    name: HDD1 Temperatur
    command: "ssh -i /config/ssh/id_rsa -o StrictHostKeyChecking=no [email protected] sudo smartctl -A /dev/sdb | grep Temperature_Celsius | awk '{print $10}'"
    unit_of_measurement: "°C"

Works as a charm!



Can you help me ?

I will wish to obtain the temperature from another raspberry.

    - platform: command_line
      name: Température_Raspberry
      scan_interval: 300
      command: ssh -i /config/.ssh/id_rsa -o StrictHostKeyChecking=no -q [email protected] sensors
      unit_of_measurement: '°C'

Not working
However in the terminal on my HA :
ssh -i /config/.ssh/id_rsa -o StrictHostKeyChecking=no -q [email protected] sensors
works !

Best regards

Does it help if you put the command in double quotes (“…”) or single (‘…’)?

    - platform: command_line
      name: Température_Raspberry
      scan_interval: 300
      command: "ssh -i /config/.ssh/id_rsa -o StrictHostKeyChecking=no -q [email protected] sensors"
      unit_of_measurement: '°C'

The same.

I don’t understand, but in the raspberry logs (/var/log/auth.log)

Failed password

In my HA logs : Command failed