Docker Kafka & Zookeeper 생성

# docker-compose.yml
version: '3'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
    ports:
      - "2181:2181"
    restart:
      - always

  kafka:
    image: confluentinc/cp-kafka:latest
    environment:
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
    ports:
      - "9092:9092"
    depends_on:
      - zookeeper
    restart:
      - always

Spring Boot에서 연동

# application.yml
kafka:
  bootstrap-servers: localhost:9092