Interpreting Nagios check_disk output

nagios

The following command on Nagios's default "check_disk" command gives the following output:

# ./check_disk  -w 20% -c 10%  -p / --units=MB 
DISK OK - free space: / 17887 MB (47% inode=93%);| /=19481MB;31495;35432;0;39369

All well and good, but does anyone know what the last four numbers (separated by semicolons) mean? Is there any way, other than wrapping the command in a script, to tailor the output to something which makes sense at first glance?

Thanks in advance…

Best Answer

This is "Performance data". Performance data is defined by Nagios as "everything after the | of the plugin output". This data is used by 3rd party programs for charts. Please see more details in the documentation https://nagios-plugins.org/doc/guidelines.html#AEN200

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How to use the Nagios check_disk plugin with autofs

Why not make a static entry in fstab instead using automount so it is always mounted?

In the GNU df manual:

This version of df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of file system structures.

So I would guess if GNU df is not going to show the free space of a partition that is not mounted, a Nagios plugin probably won't either. But I could be wrong :-)

Maybe if you are using ext2/3 , by parsing out free blocks, block count, and block size out of tune2f you might be able to quickly write a plugin that will accomplish this:

sudo tune2fs -l /dev/sdb1

Changing Centreon graph y-axis scale for used disk space

Go to Views>Graphs>Curves, there you shoudl find your Curve 'd--Used-Space'. Edit this curve and check the box 'Print Max value'.

In your line 3.65Gb;15.64;17.59;0.00;19.55 you have in fact (value)(metric);(warn level);(crit level);(min level);(max level). So you need to graph as well the max value on this metrics.

Best Answer

Related Solutions

How to use the Nagios check_disk plugin with autofs

Changing Centreon graph y-axis scale for used disk space

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