Monitoring Tomcat App with JMX Exporter

[mr-m...@wiu.edu]

I'm not figuring this out for some reason. I've got an app from a vendor that runs in Tomcat and I'd like to monitor the jmx stats.

I've added the JMX entries to the catalina.sh file and JMX is listening on 127.0.0.1:9000.

I downloaded the jar file and the tomcat.yml config example from the JMX exporter project, and added the hostPort entry to tomcat.yml.
`hostPort: 127.0.0.1:9000`

I've attempted to run it like so:
java -javaagent:./jmx_prometheus_javaagent-0.9.jar=1234:tomcat.yml

...it takes a few seconds and then just returns this and then the rest of the java usage info...

2017-06-06 14:30:49.429:INFO:ipjsoejs.Server:jetty-8.y.z-SNAPSHOT
2017-06-06 14:30:49.532:INFO:ipjsoejs.AbstractConnector:Started SelectChann...@0.0.0.0:1234
Usage: java [-options] class [args...]
.....

The README indicates I need a -jar somefile.jar on the end of that command, but I'm not sure what needs to go there. The vendor's war file?

Thanks,
Matt

[Ke Sai]

I think you only need to use the agent.jar. How I got it to work is place the jmx_prom.jar in tomcat's lib dir, and include "-javaagent:./jmx_prometheus_javaagent-0.9.jar=1234:config.yaml" in my tomcat start script, then add a scraper to prometheus.yml config.

[Ke Sai]

If you have an tomcat start script, try putting "-javaagent:./jmx_prometheus_javaagent-0.9.jar=1234:config.yaml" into CATALINA_OPTS 

On Tuesday, June 6, 2017 at 3:51:29 PM UTC-4, Matt Mencel wrote:

[Matt Mencel]

Thanks!  I actually got it working yesterday with the the jmx_prometheus_httpserver, but your solution is much cleaner so I've gone with this one.

Thanks again!

[Matt Mencel]

Interesting...  when I switched to the javaagent way of doing it, I lost all the Catalina metrics.  My config.yaml looks like this...

---
hostPort: localhost:5555
username: 
password: 

rules:
- pattern: ".*"

So I'm collecting everything.  But yesterday when I was using the httpserver way I got hundreds of metrics from the Catalina namespace and now I get none.

Matt

[Brian Brazil]

On 8 June 2017 at 15:24, Matt Mencel <mr-m...@wiu.edu> wrote:

Interesting...  when I switched to the javaagent way of doing it, I lost all the Catalina metrics.  My config.yaml looks like this...

---
hostPort: localhost:5555
username: 
password: 

Remove these lines, they're not required for the java agent.

Brian

 

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Brian Brazil

www.robustperception.io

[tangc...@gmail.com]

Hi,thanks for shining here. where do you put config.yaml file? thanks

[ashis...@gmail.com]

Hi All,

I am facing issue during configure the jmx exporter .
Could you please help me to configure.

Which entry i need to put in catalina.sh

I am folloing this blog by which i need to add jvm parameter in java application.
but i am unable to find location.

Please suggest.