how to get exact objectname for jmx monitor

[sacom01]

hi,
i found some parameters for monitoring jvm but when run jmx_check it getting error "objectName not found".
How to check exact the object name? I tried found in jConsole for check but same error.

one guy name SteveB told we can use jmx4perl but dont know how to run.
[root@dc-nagiosxi-uat01 ~]# jmx4perl http://localhost:8080/jolokia \
> --target service:jmx:rmi:///jndi/rmi://[192.168.117.1]:[9002]/jmxrmi \
> --target-user [xxxx] \
> --target-password [xxxxx] \
> list > /tmp/jmxdump.txt
-bash: jmx4perl: command not found

[kfanselow]

Hi sacom01,

It looks like either jmx4perl isn't installed on your system or it's not in your search path:

-bash: jmx4perl: command not found

If it's not installed on your system it looks like it is available on CPAN:
https://metacpan.org/dist/jmx4perl/view ... s/jmx4perl

Beyond that there may be others here who can help you with the specifics of JMX - it's a little outside my experience set : ).

Thanks and Best Regards,
Keith

[sacom01]

hi,
if dont use jmx4perl, how to determine object name?

[gsmith]

Hi,

If you have the java jdk installed on your laptop/desktop there should be an application
in C:\Program Files\Java\jdk-16\bin called jconsole.exe that you can use to connect to the
machine that is running the jvm that you want to monitor.

Thanks

[sacom01]

hi,
os is Redhat7.
As i told, i used jconsole for find Objectname but unable to run jmx check.

[root@dc-nagiosxi-uat01 ~]# /usr/local/nagios/libexec/check_jmx -U service:jmx:rmi:///jndi/rmi://192.168.117.1:9002/jmxrmi -O "java.lang:type=GarbageCollector,name=PS MarkSweep" -A "CollectionCount" -u MB -w 100 -c 200 --username xxxx --password xxxxx
JMX CRITICAL - objectName not found [java.lang:type=GarbageCollector,name=PS MarkSweep]

[gsmith]

Hi,

The problem is with the plugin, it doesn't like spaces like the one in "PS MarkSweep"

Remove the check_jmx and jmxquery.jar files from /usr/local/nagios/libexec and replace them
with the ones found in the plugin of
https://github.com/WillPlatnick/jmxquery

My results using original plugin files:

Code: Select all

[root@localhost libexec]# ./check_jmx -U service:jmx:rmi:///jndi/rmi://192.168.254.63:9010/jmxrmi -O java.lang:name="G1 Old Generation",type=GarbageCollector -A CollectionCount  -w 10 -c 20
JMX CRITICAL java.lang:name=G1

now with plugin files referenced above:

Code: Select all

[root@localhost libexec]# ./check_jmx -U service:jmx:rmi:///jndi/rmi://192.168.254.63:9010/jmxrmi -O java.lang:name="G1 Old Generation",type=GarbageCollector -A CollectionCount  -w 10 -c 20
JMX OK - CollectionCount=0 | CollectionCount=0

Thanks

[sacom01]

hi,
after replace 2 files check_jmx and jmxquery.jar, it was getting Authentication failed instead i provide username and pw:
[root@dc-nagiosxi-uat01 libexec]# ./check_jmx -U service:jmx:rmi:///jndi/rmi://192.168.117.1:9002/jmxrmi -O java.lang:name="Tenured Gen",type=MemoryPool -A "Usage.committed" -w 100 -c 200 --username xxxx--password xxxx
JMX CRITICAL - Authentication failed! Credentials required

i found different from old check_jmx and the new one :
The old one :
[root@dc-nagiosxi-uat01 libexec]# more check_jmx.bk/check_jmx
#!/bin/sh
#
# Nagios JMX plugin.
#

#JAVA_CMD=`which java`
JAVA_CMD='/home/nagios/jdk1.8.0_181/bin/java'

if [ -z $JAVA_CMD ]
then

if [ -x $JAVA_HOME/bin/java ]
then
JAVA_CMD=$JAVA_HOME/bin/java
else
echo JMX CRITICAL - java not found.
exit 2
fi

fi

DIR=`dirname $0`
$JAVA_CMD -jar $DIR/check_jmx.jar "$@"

The new one :
[root@dc-nagiosxi-uat01 libexec]# more check_jmx
#!/bin/sh
#
# Nagios plugin to monitor Java JMX (http://java.sun.com/jmx)attributes.
#
RDIR=`dirname $0`
java -jar $RDIR/jmxquery.jar "$@"

how to make it understand the authentication?

[gsmith]

Hi

What are the arguments used to launch the jvm you are trying to monitor?

Thx

[sacom01]

hi,
-Djavax.management.builder.initial=
-Dcom.sun.management.jmxremote.ssl=false
-Djava.rmi.server.hostname=ho_xxxx_06
-Dcom.sun.management.jmxremote.port=9002

when i use the old check_jmx and jmxquery.jar, it's work fine.

[sacom01]

hi bro,
any update to us?
thank you