docker-compose.yml

---
version: '3'
services:
  zookeeper:
    hostname: zookeeper
    container_name: zookeeper
    image: confluentinc/cp-zookeeper:latest
    ports:
      - "${ZK_PORT:-2181}"
    environment:
      ZOOKEEPER_CLIENT_PORT: ${ZK_PORT:-2181}
      ZOOKEEPER_TICK_TIME: 2000
    healthcheck:
      test: ["CMD-SHELL", "echo ruok | nc -w 2 localhost ${ZK_PORT:-2181}"]
      interval: 30s
      timeout: 30s
      retries: 5

  broker:
    image: confluentinc/cp-kafka:latest
    hostname: broker
    container_name: broker
    ports:
      - "${KAFKA_PORT:-9092}:${KAFKA_PORT:-9092}"
      - "29092"
    depends_on:
      - zookeeper
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:${ZK_PORT:-2181}'
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT
      KAFKA_ADVERTISED_LISTENERS: INTERNAL://broker:29092,EXTERNAL://localhost:${KAFKA_PORT:-9092}
      KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
      CONFLUENT_METRICS_REPORTER_BOOTSTRAP_SERVERS: broker:29092
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
    healthcheck:
      test: ["CMD-SHELL", "echo healthcheck | kafka-console-producer --broker-list localhost:${KAFKA_PORT:-9092} --topic healthchecktopic"]
      interval: 30s
      timeout: 30s
      retries: 5