Re: [monit] Monitoring directory size?

[Martin Pala]

Hi, the mentioned workaround should work and it was used in the past  
by several users.

We can implement native size test for directory as well - it could be  
interesting feature for some next monit version. We also plan to add  
external scripts monitoring support: http://mmonit.com/monit/next/



Similar workaround (FAQ.txt snip):

13. Q: Is here any support for external testing scripts available?

    A: We plan to add the support for external scripts in the future  
(see our
       TODO list - http://www.tildeslash.com/monit/doc/next.php#33).  
Until
       native support will be available, here are some workarounds:

       1.) nice workaround contributed by Pavel Urban is based on  
timestamp
       monitoring of file, which is updated by external script,  
running from
       cron. When everything is OK, the script will update (touch)  
the file.
       When the state is false, the script won't update the timestamp  
and
       monit will perform the related action.

       For example script for monitoring the count of files inside /tmp
       directory:
       --8<--
       #!/bin/bash
       if [ `ls -1 /tmp |wc -l` -lt 100 ]
       then
         touch /var/tmp/monit_flag_tmp
       fi
       --8<--

       run this script via cron (for example, every 20 minutes):
       --8<--
        20 * * * * /root/test_tmp_files > /dev/null 2>&1
       --8<--

       and do timestamp check on /var/tmp/monit_flag_tmp (or any file  
you decide)
       in monit control file:
       --8<--
        check file monit_flag_tmp with path /var/tmp/monit_flag_tmp
          if timestamp > 25 minutes then alert
       --8<--

       Done :)

       Another Example script: for monitoring the Solaris Volume  
Manager
       metadevices:
       --8<--
       #!/usr/bin/bash
       /usr/sbin/metastat | /usr/xpg4/bin/grep -q maintenance
       if [ $? -ne 0 ]; then
         touch /var/tmp/monit_flag_svm
       fi
       --8<--

       2.) alternatively you can use the monit's file content testing  
to watch
       logfiles or status files created similar way as described above.

       Example script:
       --8<--
       #!/usr/bin/bash
       /usr/sbin/metastat > /var/tmp/monit_svm
       --8<--

       and example monit syntax:
       --8<--
       check file svm with path /var/tmp/monit_svm
         if match "maintenance" then alert
       --8<--


Martin



On Jan 20, 2009, at 1:24 PM, Christopher Opena wrote:

> Hello all, new to the list and pretty new to monit.  I'm trying to  
> do some alerting on directory size (as opposed to file size) and I  
> see that 'size' is not a valid check under directory.  Well I tried  
> it anyway under monitrc and sure enough I got a "Error: syntax error  
> 'size'".  I've been thinking of some creative ways to get around  
> this, including setting up a cron job to create an output file of a  
> 'du -hs {directory_path}' and then having Monit do a regex check on  
> the file contents.
>
> Anyone out there doing something similar and have a cleaner way  
> they've found of doing this?
>
> Thanks in advance,
> -Chris
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