Add kafka projects

kafka/README.md

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+# Kakfa
+
+This project provides several useful Docker-Compose script to help quickly bootup a Kakfa network, and do simple testing with create topic, send&recv msg.
+
+Currently we support Kakfa 0.11.*.
+
+If you're not familiar with Docker, can have a look at these books (in CN):
+
+* [Docker Practice](https://github.com/yeasy/docker_practice)
+
+## Start
+
+```bash
+$ docker-compose up -d
+$ docker exec -it cli bash
+```

kafka/docker-compose.yaml

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+# The minimal kafka service
+# github.com/yeasy/docker-compose-files
+
+# * zk: zk node for kafka
+# * kafka: kafka service, will default to connect to zookeeper
+# * cli: client to test kafka service
+
+version: '2'
+
+services:
+  zookeeper:
+    image: yeasy/kafka:latest
+    container_name: zookeeper
+    hostname: zookeeper
+    ports:
+      - "2181:2181"  # zk connection port
+    command: bash -c 'bash /tmp/start_zk.sh'
+
+  kafka: # kafka service
+    image: yeasy/kafka:latest
+    container_name: kafka
+    hostname: kafka
+    ports:
+      - "9092:9092"
+    depends_on:
+      - zookeeper
+    command: bash -c 'bash /tmp/start_kafka.sh'
+
+  cli:  # used for testing kafka cmds, see /tmp/*.sh
+    image: yeasy/kafka:latest
+    container_name: cli
+    hostname: cli
+    environment:
+      - ZK_HOST=zookeeper # zk host to connect to
+    command: bash -c 'while true; do sleep 20170915; done'