Wed, 13 Aug 2008
Nagios Disk Check - Mountpoint or Filesystem?
If you mount filesystems under a specific mount point, and monitor
them with Nagios, then be sure
you understand what happens if the underlying file system goes away.
With:
/usr/lib/nagios/plugins/check_disk -w 15% -c 10% -p /a_mount_point
you'll get the value from the containing file system. In this case
/. If you'd rather know that your chosen mount point has
actually gone away, and that you're no longer checking what you thought
you were, then add the -E option to the command. This will
turn on exact path matching and catch that kind of error.
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Posted: 2008/08/13 21:54 | /tools/commandline | Permanent link to this entry | This entry and same date
Testing the 'Net isn't there with Nagios
We've recently had to deliberately disable some machines this week to
ensure they can't connect out to the internet - we're building testing
versions of some of our more restricted secure environments and this is
one of the steps.
It was actually easier to do with IPTables than I thought (mostly because I didn't have to do it - my co-worker did) but once the work was done we needed to ensure it didn't accidently get broken so that networking was functional again. And yes that's an odd thing to type. So naturally we turned to Nagios and so, for my own memory as much as anything else, here is the check we're using:
# put this in the machines nrpe config file.
/usr/lib/nagios/plugins/negate -t 30 "/usr/lib/nagios/plugins/check_http -w 5 -c 10 -H www.google.com -u /"
In the Nagios 'Status Information' field you'll get a message that
looks like this - CRITICAL - Socket timeout after 10
seconds - but the check returns the correct error code so it's
all green.
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Posted: 2008/08/13 21:50 | /tools/commandline | Permanent link to this entry | This entry and same date
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