JVM monitoring in a Docker environment

BusyApp.java

public final class BusyApp {
  public static void main(String []args) throws Exception {
    final java.util.Random generator = new java.util.Random();
    while (true) {
      generator.ints(1000000, 0, 100).sorted();
      Thread.sleep(5000L);
    }
  }
}

docker-compose.yml

jvmapp:
  build: .
  dockerfile: Dockerfile-jvmapp
  container_name: jvmapp
  environment:
    JMX_HOST: jvmapp
    JMX_PORT: 4000
  ports:
    - "4000:4000"
jmxtrans:
  build: . 
  dockerfile: Dockerfile-jmxtrans
  container_name: jmxtrans
  environment:
    JMX_HOST: jvmapp
    JMX_PORT: 4000
    STATSD_HOST: dashboard
    STATSD_PORT: 8125
  links:
    - jvmapp
    - dashboard
dashboard:
  image: kamon/grafana_graphite
  container_name: dashboard
  ports:
    - "80:80"
    - "81:81"
    - "8125:8125/udp"
    - "8126:8126"

Dockerfile-jmxtrans

FROM openjdk:8

RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
RUN wget http://central.maven.org/maven2/org/jmxtrans/jmxtrans/259/jmxtrans-259.deb
RUN dpkg -i jmxtrans-259.deb

COPY run-jmxtrans.sh /run-jmxtrans.sh
RUN chmod 755 /run-jmxtrans.sh

CMD /run-jmxtrans.sh

Dockerfile-jvmapp

FROM openjdk:8

COPY BusyApp.java /BusyApp.java
RUN javac BusyApp.java

ENV JMX_HOST=jvm-app
ENV JMX_PORT=4000

CMD java \
  -Djava.rmi.server.hostname=$JMX_HOST \
  -Dcom.sun.management.jmxremote \
  -Dcom.sun.management.jmxremote.port=$JMX_PORT \
  -Dcom.sun.management.jmxremote.rmi.port=$JMX_PORT \
  -Dcom.sun.management.jmxremote.local.only=false \
  -Dcom.sun.management.jmxremote.authenticate=false \
  -Dcom.sun.management.jmxremote.ssl=false \
  BusyApp

run-jmxtrans.sh

#!/bin/bash

JMXTRANS_HEAP_SIZE=${JMXTRANS_HEAP_SIZE:-"512"}
JMXTRANS_LOG_LEVEL=${JMXTRANS_LOG_LEVEL:-"info"}
JMXTRANS_PERIOD=${JMXTRANS_PERIOD:-"10"}

JMXTRANS_JAR="/usr/share/jmxtrans/lib/jmxtrans-all.jar"
JMXTRANS_CONFIG="/jmxtrans-config.json"

cat <<EOF > $JMXTRANS_CONFIG
{
  "servers": [
    {
      "host": "${JMX_HOST}",
      "port": "${JMX_PORT}",
      "queries": [
        {
          "obj": "java.lang:type=Memory",
          "attr": [ "HeapMemoryUsage", "NonHeapMemoryUsage" ],
          "outputWriters": [
            {
              "@class": "com.googlecode.jmxtrans.model.output.StdOutWriter"
            },
            {
              "@class": "com.googlecode.jmxtrans.model.output.StatsDWriterFactory",
              "host": "${STATSD_HOST}",
              "port": "${STATSD_PORT}",
              "bucketType" : "c"
            }
          ]
        }
      ]
    }
  ]
}
EOF

JAVA_OPTS="-Xms${JMXTRANS_HEAP_SIZE}m -Xmx${JMXTRANS_HEAP_SIZE}m -Djava.awt.headless=true -Djava.net.preferIPv4Stack=true"
JMXTRANS_OPTS="-Djmxtrans.log.level=${JMXTRANS_LOG_LEVEL}"
MONITOR_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=${JMX_PORT}"
EXEC="-jar $JMXTRANS_JAR -e -f $JMXTRANS_CONFIG -s $JMXTRANS_PERIOD -c false"

java -server $JAVA_OPTS $JMXTRANS_OPTS $MONITOR_OPTS $EXEC

There should be - "80:3000" in dashboard's ports section.
https://gist.github.com/sbilinski/24809966114a6b5089c2ada53eb0b4b7#file-docker-compose-yml-L26
Because Graphana UI appears to listen on port 3000 by default.
http://docs.grafana.org/installation/configuration/#http-port

Thanks for this great gist, btw.