Profiling Java application in kubernetes

Question

I want to profile my play application on my Kubernetes cluster.

I am using VisualVM, and the steps that I have taken are as follows:

Image is built on ubuntu latest

Running my play application with the following args:

"-Dcom.sun.management.jmxremote",
"-Dcom.sun.management.jmxremote.ssl=false",
"-Dcom.sun.management.jmxremote.authenticate=false",
"-Dcom.sun.management.jmxremote.port=1098"

My Image has apt-get install -y visualvm
I do kubectl port-forward <Container> 1098
Open VisualVM, And I don't see the process.

I am not sure what I am doing wrong here. When running the application on localhost (not via IDE, straight from the startup script) everything works fine.

Update 1, deployment and service

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: myApp
  labels:
    name: myApp
spec:
  replicas: 1
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      name: myApp
      labels:
        name: myApp
    spec:
      containers:
      - name: myApp
        image: ...
        args: ["-Dcom.sun.management.jmxremote", "-Dcom.sun.management.jmxremote.ssl=false", "-Dcom.sun.management.jmxremote.authenticate=false", "-Dcom.sun.management.jmxremote.port=1098"]
        ports:
        - containerPort: 9000
        env:
        ...

apiVersion: v1
kind: Service
metadata:
  name: myApp
  labels:
    name: myApp
spec:
  selector:
    name: myApp
  ports:
    - port: 80
      targetPort: 9000

Update 2 @marcospereira

File->Add JMX connection-> localhost:1098

Cannot connect to localhost:1098 using service jmx:rmi...

That is because, when you run locally, visualvm know how to recognize the local Java processes. You need to add a "JMX Connection" (File -> Add JMX Connection). — marcospereira, Jan 18 '17 at 18:49

score 5 · Answer 1 · answered Sep 05 '18 at 14:52

It can be executed in the same form as QA below.

multiple app nodes how to expose jmx in kubernetes?

Please set java.rmi.server.hostname System Property.

"-Dcom.sun.management.jmxremote",
"-Dcom.sun.management.jmxremote.ssl=false",
"-Dcom.sun.management.jmxremote.authenticate=false",
"-Dcom.sun.management.jmxremote.port=1098"
"-Djava.rmi.server.hostname=127.0.0.1" #add

Jmx connect to localhost:1098 .

I confirmed that I could connect.

Fabián · Answer 2 · 2021-08-03T19:48:46.553

2

You have to add the rmi port option too -Dcom.sun.management.jmxremote.rmi.port=1098

edited Aug 03 '21 at 19:48

answered Oct 05 '20 at 15:59

Fabián

51
5

score 1 · Answer 3 · answered Aug 19 '21 at 05:17

You need to run below command to port forward in a correct manner:

kubectl port-forward ${pod_name} 1098:1098

In visualvm, add jmx connection with localhost:1098.

Add below parameters to enable jmx connection in your java options,

  -Dcom.sun.management.jmxremote
  -Dcom.sun.management.jmxremote.port=1098
  -Dcom.sun.management.jmxremote.rmi.port=1098
  -Dcom.sun.management.jmxremote.authenticate=false
  -Dcom.sun.management.jmxremote.ssl=false
  -Djava.rmi.server.hostname=127.0.0.1

Profiling Java application in kubernetes

3 Answers3