Using check_space.py

[andyl]

Hi,

I'm trying to use check_space.py to notify me when available space on my FreeNAS box drops below 25Gb.

I ran it once with the following options;

Code:

python /usr/local/www/freenasUI/tools/check_space.py -d [dataset] -t 10%

I do have less than 10% disk free, and I duly received an email confirming that, so I know the script & email work. But if have a 5Tb volume, that spends most of its time with less than 10% available. I want to be informed if it drops below 25Gb. So I ran the command as follows;

Code:

python /usr/local/www/freenasUI/tools/check_space.py -d [dataset] -t 25G

But this time I received no email. I can find no documentation on the script, and I don't know enough Python to figger it out myself.

Is there a time delay on the script, or am I using it wrong?

Endgame is to have it running from a timed job, as detailed in the following thread;
http://forums.freenas.org/index.php...e-space-dips-below-a-defined-threshold.15892/
I'm more familiar with Linux than BSD, and I'd normally run it from cron.daily - is there a similar mechanism on FreeNAS?

Thanks

 

[Yatti420]

Works for me.. Can you verify permissions etc.. Most likely didn't run on the second pass.. I never touch these files with Windows or they always break..

 

[andyl]

I am running whilst SSHed in as root on the FreeNAS box - I don't think its a Windows or permissions issue.
The script doesn't issue any errors - just runs and drops back to a command prompt, with the command as above.
I have run it multiple times, and get the same result every time (after the first).

How often do you run the script?

Thanks,
Andy.

 

[Yatti420]

Use cron to execute the script whenever you want.. See the link in your original post..

 

[andyl]

But if it doesn't work when issued as a command, why would it work from cron?

I set it up on a 5 min cycle anyways, so root's crontab looks like this;

Code:

*/5 * * * *  [path]/check_space.sh

Initially the check_space.sh script looked like;

Code:

#!/bin/sh
for pool in `zpool list -Ho name`
do
  python /usr/local/www/freenasUI/tools/check_space.py -d $pool -t 10%
done

But I started getting emails indicating that the script was falling to find zpool;

Code:

[path]/check_space.sh: zpool: not found

So I changed the check_space script to;

Code:

python /usr/local/www/freenasUI/tools/check_space.py -d [pool-name] -t 10%

Now I'm getting errors from cron indicating that it can't find python.
Do I need to export the path to cron in some fashion?

Thanks,
Andy.

 

[croca]

But if it doesn't work when issued as a command, why would it work from cron?

I set it up on a 5 min cycle anyways, so root's crontab looks like this;

Code:

*/5 * * * *  [path]/check_space.sh

Initially the check_space.sh script looked like;

Code:

#!/bin/sh
for pool in `zpool list -Ho name`
do
  python /usr/local/www/freenasUI/tools/check_space.py -d $pool -t 10%
done

But I started getting emails indicating that the script was falling to find zpool;

Code:

[path]/check_space.sh: zpool: not found

So I changed the check_space script to;

Code:

python /usr/local/www/freenasUI/tools/check_space.py -d [pool-name] -t 10%

Now I'm getting errors from cron indicating that it can't find python.
Do I need to export the path to cron in some fashion?

Thanks,
Andy.

Yes, you need to specify the python path in the script:
/usr/local/bin/python /usr/local/www/freenasUI/tools/check_space.py -d [pool-name] -t 10%

For example:

#!/bin/sh
PYTHON=`which python`
THRESHOLD="10%"
for POOL in `zpool list -Ho name`
do
$PYTHON /usr/local/www/freenasUI/tools/check_space.py -d $POOL -t $THRESHOLD
done

 

[andyl]

Thanks for the response!