我正试图通过docker连接到单节点kafka服务器，但出现以下错误：

%3|1529395526.480|FAIL|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused
%3|1529395526.480|ERROR|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: localhost:9092/bootstrap: Connect to ipv4#127.0.0.1:9092 failed: Connection refused
%3|1529395526.480|ERROR|rdkafka#producer-1| [thrd:localhost:9092/bootstrap]: 1/1 brokers are down

docker-compose.yml文件内容如下：

version: '2'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    network_mode: host
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    extra_hosts:
      - "moby:127.0.0.1"

  kafka:
    image: confluentinc/cp-kafka:latest
    network_mode: host
    depends_on:
      - zookeeper
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: localhost:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092
      KAFKA_ADVERTISED_HOSTNAME: kafka
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
    extra_hosts:
      - "moby:127.0.0.1"

  schema_registry:
    image: confluentinc/cp-schema-registry
    hostname: schema_registry
    depends_on:
      - zookeeper
      - kafka
    ports:
      - "8081:8081"
    environment:
      SCHEMA_REGISTRY_HOST_NAME: schema_registry
      SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: '127.0.0.1:2181'

dockerfile内容如下：

FROM python:2

WORKDIR /kafkaproducerapp

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD [ "python", "./BackOffice_Producer.py" ]

我做错什么了？