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:

1. Image is built on ubuntu latest

2. 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"

3. My Image has apt-get install -y visualvm

4. I do kubectl port-forward <Container> 1098
5. 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...

Answer 1

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.

Answer 2

您也必须添加 rmi 端口选项 -Dcom.sun.management.jmxremote.rmi.port=1098

Answer 3

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