Nagios Monitor Tomcat JMX

1. Download the check_jmx from http://exchange.nagios.org/directory/Plugins/Java-Applications-and-Servers/check_jmx/details

2. Modify check_jmx to accept the arguments with space

From 

RDIR=`dirname $0`

java -cp $RDIR/jmxquery.jar org.nagios.JMXQuery $@

To

RDIR=`dirname $0`

java -cp $RDIR/jmxquery.jar org.nagios.JMXQuery "$@"

3. Copy the files in check_jmx/nagios/plugins to /usr/local/nagios/libexec

4. Run the command to test: 

./check_jmx -U service:jmx:rmi:///jndi/rmi://192.168.204.40:8585/jmxrmi -O java.lang:type=Memory -A HeapMemoryUsage -K used -I HeapMemoryUsage -J used -vvvv -w 10000000 -c 100000000

Result: JMX WARNING HeapMemoryUsage.used=78949072{committed=129892352;init=134217728;max=259522560;used=78949072}

5. Go to folder /usr/local/nagios/etc/objects

6. Add following context into file commands.cfg

define command{

        command_name    check_jmx

        command_line    /usr/local/nagios/libexec/check_jmx -U service:jmx:rmi:///jndi/rmi://$ARG1$:$ARG2$/jmxrmi $ARG3$

        }

7. Add following context into file /usr/local/nagios/etc/objects/localhost.cfg

A. JMX Memory Monitor

define service{

        use                             local-service

        host_name                       localhost

        service_description             192.168.204.40 Tomcat JMX Memory

        check_command                   check_jmx!192.168.204.40!8585! -O java.lang:type=Memory -A HeapMemoryUsage -K used -I HeapMemoryUsage -J used -vvvv -w 207618048 -c 233570304

        }

B. Thread Monitor

define service{

        use                             local-service

        host_name                       localhost

        service_description             192.168.204.40 Tomcat JMX Threads

        check_command                   check_jmx!192.168.204.40!8585! -O java.lang:type=Threading -A ThreadCount -w 200 -c 500

        }

C. Code Cache Memory

define service{

        use                             local-service

        host_name                       localhost

        service_description             192.168.204.40 JMX Code Cache Memory

        check_command                   check_jmx!192.168.204.40!8585! -O java.lang:type=MemoryPool,name="Code Cache" -A Usage -K used

        }

D. ActiveSession of Thor Application

define service{

        use                             local-service

        host_name                       localhost

        service_description             192.168.204.40 JMX Thor activeSessions

        check_command                   check_jmx!192.168.204.40!8585! -O Catalina:type=Manager,context=/Thor,host=localhost -A activeSessions -vvvv -w 100 -c 200

        }

Attention: some tomcat need to check with command

check_jmx!192.168.204.40!8585! -O Catalina:type=Manager,path=/Thor,host=localhost -A activeSessions -vvvv -w 100 -c 200

8. make pnp4nagios paint. 

Change the context of /usr/local/nagios/libexec 

from

RDIR=`dirname $0`

java -cp $RDIR/jmxquery.jar org.nagios.JMXQuery "$@"

to

RDIR=`dirname $0`

OUTPUT=`java -cp $RDIR/jmxquery.jar org.nagios.JMXQuery "$@"`

EXIT_STATUS=$?

STATUS=`echo $OUTPUT`

VALUE=`echo $OUTPUT | awk '{print $NF}'`

echo "$STATUS | $VALUE"

exit $EXIT_STATUS