Add Jolokia

Dockerfile

@@ -22,7 +22,7 @@ ENV KAFKA_VERSION=$kafka_version \
 
 ENV PATH=${PATH}:${KAFKA_HOME}/bin
 
-COPY download-kafka.sh start-kafka.sh broker-list.sh create-topics.sh versions.sh /tmp/
+COPY download-kafka.sh start-kafka.sh broker-list.sh create-topics.sh versions.sh download-jolokia.sh /tmp/
 
 RUN apk add --no-cache bash curl jq docker \
  && mkdir /opt \
@@ -32,6 +32,7 @@ RUN apk add --no-cache bash curl jq docker \
  && tar xfz /tmp/kafka_${SCALA_VERSION}-${KAFKA_VERSION}.tgz -C /opt \
  && rm /tmp/kafka_${SCALA_VERSION}-${KAFKA_VERSION}.tgz \
  && ln -s /opt/kafka_${SCALA_VERSION}-${KAFKA_VERSION} /opt/kafka \
+ && /tmp/download-jolokia.sh \
  && rm /tmp/* \
  && wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/${GLIBC_VERSION}/glibc-${GLIBC_VERSION}.apk \
  && apk add --no-cache --allow-untrusted glibc-${GLIBC_VERSION}.apk \

README.md

@@ -187,6 +187,15 @@ For example, to connect to a kafka running locally (assumes exposing port 1099)
 
 Jconsole can now connect at ```jconsole 192.168.99.100:1099```
 
+## Jolokia
+
+For get JMX Metric via jolokia HTTP, set environment
+
+```
+KAFKA_JOLOKIA_PORT: 7777
+```
+
+
 ## Docker Swarm Mode
 
 The listener configuration above is necessary when deploying Kafka in a Docker Swarm using an overlay network. By separating OUTSIDE and INSIDE listeners, a host can communicate with clients outside the overlay network while still benefiting from it from within the swarm.

download-jolokia.sh

@@ -0,0 +1,5 @@
+#!/bin/sh -e
+
+wget "http://search.maven.org/remotecontent?filepath=org/jolokia/jolokia-jvm/1.6.0/jolokia-jvm-1.6.0-agent.jar" -O "/tmp/jolokia-jvm-1.6.0-agent.jar"
+mv "/tmp/jolokia-jvm-1.6.0-agent.jar" /opt/kafka/libs
+chmod a+x /opt/kafka/libs/jolokia-jvm-1.6.0-agent.jar

start-kafka.sh

@@ -96,6 +96,11 @@ if [[ -z "$KAFKA_ADVERTISED_HOST_NAME$KAFKA_LISTENERS" ]]; then
     export KAFKA_ADVERTISED_HOST_NAME="$HOSTNAME_VALUE"
 fi
 
+# Jolokia 
+if [[ -n "$KAFKA_JOLOKIA_PORT" ]]; then
+    export KAFKA_OPTS="-javaagent:$KAFKA_HOME/libs/jolokia-jvm-1.6.0-agent.jar=port=$KAFKA_JOLOKIA_PORT,host=0.0.0.0 $KAFKA_OPTS"
+fi
+
 #Issue newline to config file in case there is not one already
 echo "" >> "$KAFKA_HOME/config/server.properties"