Monitoring Script for resources

Tue Nov 3 11:37:17 EST 2009

This is a small script to display the resources utilization of a NSLU2 running linux on a web page in plain HTML, It is coded in BASH and some JavaScript in orther to display the information. Here is what the output looks like:

Source Code of resources.sh:

#!/bin/bash

#GETTING THE DAYS OF UPTIME
let UP_TIME=`uptime | awk '{print $3" "$5}' | sed 's/:/ /g' |\
awk '{print "("$1"*24)+"$2}'`

#CALCULATING FREE RAM PERCENTAGE
mem_total=`grep MemTotal /proc/meminfo|awk '{print $2}'`
mem_free=`grep MemFree /proc/meminfo|awk '{print $2}'`
percent=$(echo "scale=2; $mem_free/$mem_total*100" | bc -l)

#GETTING THE AVERAGE LOAD OF THE SERVER 
load_10=`uptime | awk '{print $11}'|sed 's/,//g'`

#BUILDING THE *.js FILE
echo "var resources=\"<b>Last Updated: </b> `date`<br /><b>UP Days: 
</b>$UP_TIME<br /><b>Free RAM:</b> $percent% ($mem_free kB)<br />
<b>Load: </b>$load_10<br />\";"
echo "document.write(resources);"

You then direct the output of that script to a file in your RootDirectory, in my case I am using /resources.js and I execute resources.sh every 5 minutes from a cronjob.

Source Code of resources.js:

var resources="<b>Last Updated: </b> Tue Nov  3 12:00:02 EST 2009<br />
<b>UP Days: </b>2549<br /><b>Free RAM:</b> 5.00% (1552 kB)<br /><b>Load: 
</b>0.21<br />";
document.write(resources);

I use the following code to display the information:

<script src="http://www.orvtech.com/resources.js" type="text/javascript"><
/script>

Spanish version: Script para monitorear recursos del sistema en el NSLU2.