docker-compose.yml

---
version: '2'
services:
  zookeeper:
    image: "confluentinc/cp-zookeeper:5.1.0"
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000

  kafka:
    image: "confluentinc/cp-enterprise-kafka:5.1.0"
    ports:
      - '9092:9092'
    depends_on:
      - zookeeper
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092
      KAFKA_AUTO_CREATE_TOPICS_ENABLE: "true"
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 100
    command: 
      - bash 
      - -c 
      - |
        rm /data/kafka-is-up
        # Launch Kafka
        /etc/confluent/docker/run &
        # Wait for Kafka to start and then create a file to 
        # indicate that it's listening
        echo "Waiting for Kafka to start listening on 9092 ⏳"
        nc -vz localhost 9092
        is_up=$$?
        while [ $$is_up -ne 0 ] ; do 
          echo -e $$(date) $$(nc -z localhost 9092)
          nc -vz localhost 9092
          is_up=$$?
          sleep 5 
        done
        echo "Kakfa is now listening! :-)"
        touch /data/kafka-is-up
        sleep infinity
    volumes:
      - up-flag:/data

  # schema-registry:
  #   image: "confluentinc/cp-schema-registry:5.1.0"
  #   depends_on:
  #     - kafka
  #   ports:
  #     - '8081:8081'
  #   environment:
  #     SCHEMA_REGISTRY_HOST_NAME: schema-registry
  #     SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: zookeeper:2181

  ksql-server:
    image: confluentinc/cp-ksql-server:5.1.0
    depends_on:
      - kafka
      # - schema-registry
    environment:
      KSQL_BOOTSTRAP_SERVERS: kafka:29092
      KSQL_LISTENERS: http://0.0.0.0:8088
      # KSQL_KSQL_SCHEMA_REGISTRY_URL: http://schema-registry:8081
      # KSQL_KSQL_SERVICE_ID: confluent_rmoff_01

  ksql-cli:
    image: confluentinc/cp-ksql-cli:5.1.0
    depends_on:
      - ksql-server
    entrypoint: /bin/sh
    tty: true

  kafkacat:
    image: confluentinc/cp-kafkacat:latest
    depends_on:
      - kafka
    command: 
      - bash 
      - -c 
      - |
        echo "Waiting for flag that Kafka is up… ⏳"
        until [ -f /flags/kafka-is-up ]
        do
            echo -e $$(date) ": Waiting for flag that Kafka is up… ⏳"
            sleep 5
        done
        echo -e $$(date) ": \o/ Got the flag that Kafka is up!"
        kafkacat -b kafka:29092 -P -K: -t customers -l /data/customers.json 
        while [ 1 -eq 1 ]
          do awk '{print $$0;val=rand() *30;system("sleep "val);}' /data/customers_incremental.json  | \
              kafkacat -b kafka:29092 -P -K: -t customers
          done
    volumes: 
      - $PWD:/data
      - up-flag:/flags

volumes:
    up-flag: {}