How to write your own Ganglia gmetric monitors

 

To define a new metric to monitor below is a an example

This metric could read and monitor the number of users currently logged in to the system and display the graph in ganglia front end.

Path for gmetric command:

Soaris: /usr/local/bin/gmetric

Aix: /opt/freeware/bin/gmetric

Linux: /usr/bin/gmetric

This command is available for all users.

Below is the command to monitoring number of users and display corresponding graph in Ganglia front end

/usr/local/bin/gmetric --name Current_Users --value `who |wc -l` --type int32 –unit current_users

Here:

/usr/local/bin/gmetric -> is the ganglia client command

--name Current_Users  -> this will be the name of graph

--value `who |wc -l` -> this is the value(this command should return a single number)

--type int32 -> type of value(since it’s a number its int32)

 

Now you can either crontab this command or  just loop it as below.

#while true; do /usr/local/bin/gmetric --name Current_Users --value `who |wc -l` --type int32 --unit current_users; sleep 10; done

Now this graph is visible on ganglia portal.

Script for Continuous monitoring of percentage of page file usage in solaris

#script for monitoring page file usage in %. written by latheefp@gmail.com

while true

do

used=`swap -s|awk {'print $9'}|cut -dk -f1`

#echo "Used is :`expr $used / 1024`MB"

avail=`swap -s|awk {'print $11'}|cut -dk -f1`

#echo "Available is :`expr $avail / 1024`MB"

total=`expr $used + $avail`

#echo "Total is :`expr $total / 1024`MB"

percused=`expr $used \* 100`

percent=`expr $percused / $total`

#echo "Percentage of page file usage is :$percent% "

clear

echo "Used Available Total %Used"

echo "`expr $used / 1024`MB `expr $avail / 1024`MB `expr $total / 1024`MB $percent%"

sleep 5

done