Running a command on boot

[Glengineer]

Hello,

I want to run a python script I wrote that controls the fans on my server. The script is a loop so needs to stay running.

I went to the manual and saw Tasks > Init/Shutdown Scripts. I tried running the command `python /mnt/Test\ Storage/windowset/scripts/fan-controller.py` (and also with out the space escaped) and the timeout set to 0 but this did not work.

Any advise on how I can achieve my goal - I'm obviously very new to servers and TrueNAS.

 

[Alecmascot]

Are you running this Post Init ?

 

[Glengineer]

Are you running this Post Init ?

I have tried both.

If I set timeout to 0 that won't end the script, right? I guess this script is more of a service as it needs to be running constantly to monitor the temps.

 

[joeschmuck]

Does this script work when typed at the command line?
Have you looked at the TrueNAS log file to see what it might be telling you?
Is the command really

`python /mnt/Test\ Storage/windowset/scripts/fan-controller.py`

I ask because while I'm not an expert, I question the path name structure, the slash after "Test".
You might need to define the full path to python.

 

[Glengineer]

It does work via the command line, I included the \ to escape the space but I tried it without that.

I'll check the logs.

 

[Glengineer]

I checked the logs but grep did not find anything for python or py.

 

[joeschmuck]

I checked the logs but grep did not find anything for python or py.

That is not good, I'd hope to see something.
Maybe a few screen shots of your GUI on how you entered the data, while I don't expect to see anything wrong, maybe something will jump out at someone. Also, try to put the script in a place where you do not have to use the \ symbol. It's an attempt to try something different because the GUI might not be able to handle it.

If I set timeout to 0 that won't end the script, right?

Um, where did you read that? I'm asking because I have not seen it and I'd like to confirm it. I would test this by making the value something like 500, this give you time to open a shell and use "top" to see if your script is running. Also, use "top" to test your script manually so you know what your are looking at. Hopefully it will work.

 

[Glengineer]

Thanks for your assistance @joeschmuck

I believe the issue with was the timeout setting. I changed the command to run in the background and redirected the output to a log file and it is all working now.

The full command I used is:

Code:

nohup python /mnt/Test\ Storage/windowset/scripts/fan-controller.py > /var/log/fan-controller.log 2>&1 &

With a timeout of 10

 

[joeschmuck]

Great news, glad that worked. If your script is something others could make use of, you could post it as a resource and let others benefit from your work. We do that here, share knowledge.

Cheers!

 

[ornias]

also: You might want to specify "python3" instead of "python"