Monitoring Script Example

[rubbish]

#!/usr/bin/perl
#
#########################
# Author: Ryan Ruebusch
# 06/23/05
# JBossMonitor.sh
#########################
#
##################################
# Function: Monitor Connection Pool, Active Threads
# and Memory, if any fail, restart JBoss and notify
#
# Things to change if you use this script:
# * yourapp
# * JAVA_HOME path
# * JBossBin path
# * Then, just use the sendmail function you have
# and your JBoss restart script
##################################
#
#
####################
# Define variables
####################
#
$ENV{"JAVA_HOME"} = "/opt/j2sdk1.4.2_08";
$JBossBin = "/opt/jboss-4.0.1sp1/bin";
#
##########################
# Run Twiddle to grab the stuff we need
##########################
#
$freeram=`$JBossBin/twiddle.sh get jboss.system:type=ServerInfo FreeMemory | cut -f2 -d"="`;
$maxram=`$JBossBin/twiddle.sh get jboss.system:type=ServerInfo MaxMemory | cut -f2 -d"="`;
$activethreads=`$JBossBin/twiddle.sh get jboss.system:type=ServerInfo ActiveThreadCount | cut -f2 -d"="`;
$yourappDS=`$JBossBin/twiddle.sh get jboss.jca:name=ds/yourapp,service=ManagedConnectionPool AvailableConnectionCount | cut -f2 -d"="`;
#
#############
# Now use the stuff
#############
#
$percentRAM=int(($freeram/$maxram) * 100);

if ($percentRAM < 30)
{
`/home/myUID/jbossbin/sendemail.sh mykey "ALERT: yourapp-Server RAM is low!" "Available RAM at $percentRAM %. Investigate now."`;
}

if ($activethreads > 300)
{
`/home/myUID/jbossbin/sendemail.sh mykey "ALERT: JBoss Thread Count is High" "Thread count at $activethreads. Investigate now."`;
}

if ($yourappDS < 10)
{
`/home/myUID/jbossbin/sendemail.sh mykey "ALERT: yourapp-Server Connection Pool is Low" "Available Connections at $yourappDS . Investigate now."`;
}
#
################################
# Restart if yourapp DS connections don't restore
################################

$strikes = 0;
if ($yourappDS < 1)
{
for ($i = 1; $i <=3; $i++)
{
`sleep 20`;
if ($yourappDS < 3)
{
$strikes++;
}
}
if ($strikes = 3)
{
`/home/myUID/jbossbin/sendemail.sh mykey "Production yourapp Emergency Restart Was Needed" "yourapp Restart was required! Please verify application comes back up. Available connections stayed at $yourappDS for 1 minute."`;
`/home/myUID/jbossbin/restartJBoss.sh`;
}
}


Keywords: monitor monitoring script scripts perl unix example sample JMX twiddle restart notify

[burakbayramli]

There is open source GUI tool JmxMonitor for watching JMX MBeans remotely; You can set threshold values which are watched for violation, if any are, e-mails sent out, GUI displays the alerts, etc.

The code uses the adaptor pattern to connect to a JMX Server, so it can also work with a socket adaptor, file adaptor.

http://jmxmonitor.sourceforge.net