Merge pull request spotify#19 from akomic/master

Updates Dockerfile to optimize image size

Author: rohansingh

kafka/Dockerfile

@@ -11,17 +11,15 @@ ENV KAFKA_HOME /opt/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION"
 RUN apt-get update && \
     apt-get install -y zookeeper wget supervisor dnsutils && \
     rm -rf /var/lib/apt/lists/* && \
-    apt-get clean
-
-RUN wget -q http://apache.mirrors.spacedump.net/kafka/"$KAFKA_VERSION"/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz -O /tmp/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz && \
+    apt-get clean && \
+    wget -q http://apache.mirrors.spacedump.net/kafka/"$KAFKA_VERSION"/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz -O /tmp/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz && \
     tar xfz /tmp/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz -C /opt && \
     rm /tmp/kafka_"$SCALA_VERSION"-"$KAFKA_VERSION".tgz
 
 ADD scripts/start-kafka.sh /usr/bin/start-kafka.sh
 
 # Supervisor config
-ADD supervisor/kafka.conf /etc/supervisor/conf.d/kafka.conf
-ADD supervisor/zookeeper.conf /etc/supervisor/conf.d/zookeeper.conf
+ADD supervisor/kafka.conf supervisor/zookeeper.conf /etc/supervisor/conf.d/
 
 # 2181 is zookeeper, 9092 is kafka
 EXPOSE 2181 9092