Linux

check free ram

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Description:

A simple shell script for nagios to check free memory on a target system

Current Version

1.0

Last Release Date

2009-12-15

Compatible With

  • Nagios 2.x

Owner

Markus Walther

Website

http://www.markuswalther.org/

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Project Files
FileDescription
check_ram.sh
Project Notes
A simple shell script for nagios to check free memory on a target system The plugin was designed to do active checks using check_by_ssh to check clients like a firewall. Tested with smoothwall.
Reviews (1) Add a Review
Simple and effective, but maybe misleading?
by syzygy, September 30, 2012
I'm using this plug-in for both my local machine and remote servers.

However, 'free' memory, when returned using the 'free' command, can be misleading, since memory is available at the moment it's required, but allocated for caching the rest of the time.

More information is here: http://www.linuxatemyram.com

Might I suggest the -/+ buffers/cache value is used?

free=`free | grep Mem | sed -r 's/ +/ /g' | cut -d -f 4`

to

free=`free | grep "buffers/cache" | sed -r 's/ +/ /g' | cut -d -f 4`

gives a better reading of 'available' memory...
1 of 1 found this review helpful.
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