add kafka

kafka/2.1.0/Dockerfile

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+FROM openjdk:8-jre-alpine
+
+MAINTAINER Newnius <newnius.cn@gmail.com>
+
+# Prerequisites
+RUN apk add --no-cache bash
+
+# Install Kafka
+RUN wget -O kafka.tgz http://us.mirrors.quenda.co/apache/kafka/2.1.0/kafka_2.11-2.1.0.tgz && \
+	tar -xzf kafka.taz -C /usr/local/ && rm kafka.tgz
+
+RUN ln -s /usr/local/kafka_2.11-2.1.0 /usr/local/kafka
+
+ENV KAFKA_HOME /usr/local/kafka
+
+WORKDIR $KAFKA_HOME
+
+ADD start_kafka.sh /etc/start_kafka.sh
+
+CMD ["/etc/start_kafka.sh"]

kafka/2.1.0/README.md

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+TBD
+
+```bash
+docker service create \
+	--name kafka \
+	--hostname=kafka \
+	--network swarm-net \
+	--detach=true \
+	--replicas 1 \
+	--endpoint-mode dnsrr \
+	newnius/kafka:2.1.0
+```

kafka/2.1.0/start_kafka.sh

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+#!/bin/bash
+
+## Overide default configuration files
+: ${EXTRA_CONF_DIR:=/config/kafka}
+
+if [ -d "$EXTRA_CONF_DIR" ]; then
+	cp $EXTRA_CONF_DIR/* /usr/local/kafka/config
+fi
+
+bash /usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties