Kafka access inside and outside docker [duplicate]

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What I needed to do was to declare the LISTENERS as both binding to all interfaces, and then advertise them differently – one to the docker network, one to the host:

services:
  zookeeper:
    image: confluentinc/cp-zookeeper
    ports:
      - "2181:2181"
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
      ZOOKEEPER_SYNC_LIMIT: 2
  kafka:
    image: confluentinc/cp-kafka
    ports:
      - 9094:9094
    depends_on:
      - zookeeper
    environment:
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_LISTENERS: INTERNAL://0.0.0.0:9092,OUTSIDE://0.0.0.0:9094
      KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka:9092,OUTSIDE://localhost:9094
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,OUTSIDE:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL

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