Using command_line sensor on host

Installation Home Assistant OS
1

I’m trying to set up a command_line sensor for monitoring the hardrive temperature on the host of HASS.io.
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
2

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

3

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

4

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.

5

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!

6

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, https://megamorphf.github.io/homeassistant/hyperion/ssh/hassio/2018/01/22/controlling-anything-via-ssh.html, 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!

3 Likes
7

Hello,

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

8

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'
9

The same.

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

Failed password

In my HA logs : Command failed