Tomcat & JMX extensions

[Whatty]

Good afternoon,

I would like to know whether or not Cacti can be used to gather JMX based information on the internals of a Tomcat server.

I have seen a couple of posts regarding overall response times (assuming through HTTP GETS), but would like to gather more detailed statistics that can be established through JMX.

Any assistance would be greatly appreciated.

Thanks in advance.

[rony]

If you can write a script to gather the information, then Cacti can graph it.

It's simply as that.

The complex part might be writing the script.

[gandalf]

Good afternoon,

I would like to know whether or not Cacti can be used to gather JMX based information on the internals of a Tomcat server.

I have seen a couple of posts regarding overall response times (assuming through HTTP GETS), but would like to gather more detailed statistics that can be established through JMX.

Any assistance would be greatly appreciated.

Thanks in advance.

If you make any progress in this, I'd would be very interested about your findings. If you have problems putting your data into cacti, I will help. But for this I would need the structure of the data you want to put into cacti
Reinhard

[Whatty]

As far as I can tell, the easiest way to go about this would be to utilize a JMX SNMP agent extension.

Of course this unto itself would require further effort to determine how it would work.

[inetquestion]

Has anyone made any progress on this front?

[schurzi]

maybe you can look into: http://forums.cacti.net/viewtopic.php?t ... sc&start=0

we wrote some tomcat scripts our self. for that we used the jmxproxy Servlet.

for example with perl you can do:
#!/usr/bin/perl
#
#

use strict;
use LWP::Simple;

my $host = shift;
my $username = shift;
my $password = shift;
my $MBean = shift;
my $url = 'http://' . $username . ':' . $password .'@' . $host . '/manager/jmxproxy/?qry= . $MBean;

The Output is nearly cacti compatible. If you dont specify an qry Parameter you get a full list. You can use every Name from this List to specify the Query, if you want multiple MBeans you can use an '*'

[roland]

FYI, there is a package called jmx4perl
(http://search.cpan.org/~roland/jmx4perl/) which might be of
interest for those needing a JMX integration with Cacti. This package
allows for scripting JMX access to remote Java application servers without
the need of a locally installed Java runtime environment (behind the
scenes this is done with JSON over HTTP). You need to install a small
(<100k) agent servlet on the app server, though.

The distribution includes a Nagios Plugin which can serve as a good
example for how to use JMX::Jmx4Perl programmatically. The
documentation is not that bad, too.

If you need some help for integrating JMX::Jmx4Perl for Cacti (which I
use myself and really like), don't hesitate to ask.

roland (author of jmx4perl)

And, yes, sorry for the plug. But I thought it might be of interest for you

[davetbo]

Roland,

You mentioned that you use Cacti with JMX4Perl. Do you have an example script you could share?

Best,
Dave

[roland]

Dabe,

You mentioned that you use Cacti with JMX4Perl. Do you have an example script you could share?

Actually, there is no cacti script within the jmx4perl distribution (but it is planned). But you can refer to http://forums.cacti.net/post-197459.html which is a nice howto for using jmx4perl with cacti.

roland.

[davetbo]

Thanks for the quick reply, Roland. I will check that out!

Dave