docker-compose.yml

version: "3.7"
services:
  zoo1:
    image: zookeeper:3.6.2
    hostname: zoo1
    environment:
      ZOO_MY_ID: 1
      ZOO_PORT: 2181
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181

  kafka1:
    image: confluentinc/cp-kafka:5.5.2
    hostname: kafka1
    ports:
      - "9092:9092"
    environment:
      KAFKA_ADVERTISED_LISTENERS: LISTENER_DOCKER_INTERNAL://kafka1:19092,LISTENER_DOCKER_EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_DOCKER_INTERNAL:PLAINTEXT,LISTENER_DOCKER_EXTERNAL:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_DOCKER_INTERNAL
      KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181"
      KAFKA_BROKER_ID: 1
      KAFKA_LOG4J_LOGGERS: "kafka.controller=INFO,kafka.producer.async.DefaultEventHandler=INFO,state.change.logger=INFO"
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
    depends_on:
      - zoo1

  kafdrop:
    image: obsidiandynamics/kafdrop:3.27.0
    ports:
      - "8090:9000"
    environment:
      KAFKA_BROKERCONNECT: "kafka1:19092"
    depends_on:
      - kafka1

  letters-data-loader:
    image: confluentinc/cp-kafkacat:5.5.2
    entrypoint: ["/bin/bash", "-c"]
    environment:
      KAFKA_INPUT_TOPIC: ${kafka_input_topic:-test_input}
    command: ['while true; do echo {\"text\":\"Hello World\"} | kafkacat -P -b kafka1:19092 -t $${KAFKA_INPUT_TOPIC}; sleep 5; done',]
    depends_on:
      - kafka1