Prometheus unable to scrape from tomcat container

[sarbajit das]

Hi All,

I trying to deploy a small application in a tomcat docker container and trying to monitor the container using Prometheus with the help of node exporter. But I am unable scrape metrics even though metrics is actually being pulled. Below is my Dockerfile :

FROM jatayu99/my-tomcat:latest
ADD prometheus-jmx-config.yml /prometheus-jmx-config.yml
ADD jmx_prometheus_javaagent-0.13.0.jar /jmx_prometheus_javaagent-0.13.0.jar
COPY ConferenceRoomCapstoneB35.war /usr/local/tomcat/webapps
ENV JAVA_OPTS="$JAVA_OPTS -javaagent:/jmx_prometheus_javaagent-0.13.0.jar=9830:/prometheus-jmx-config.yml"
EXPOSE 9830 8080

sarbajit@UBUNTU:~/expr/proj-ansi-roles$ cat roles/03-build-image/files/prometheus-jmx-config.yml
ssl: false
lowercaseOutputName: false
lowercaseOutputLabelNames: false

But if I try to use port 8080 for jmx_prometheus_javaagent-0.13.0.jar then prometheus is able to pull the metrics but my application is not running in that scenario.

Can anyone please help regarding this problem ??

Thanks & Regards,

Sarbajit Das

[Matthias Rampke]

I think something is going wrong with the port mapping here. If I am reading the Dockerfile reference correctly, to expose multiple ports use multiple EXPOSE lines, like

EXPOSE 8080

EXPOSE 9830

Additionally, you need to still use the -p or -P flags on docker run to really expose the ports. Try being very explicit about all the ports:

docker run -p 8080:8080 -p 9830:9830 …

Then see if you can curl both ports.

/MR

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