无法通过 Docker 连接到单节点 Kafka 服务器

Question

我正在尝试通过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" ]

我做错了什么？

Answer 1

你需要这个：

KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:9092

否则，Kafka 代理会告诉任何连接的人可以在localhost:9092上找到它，这在其他容器上不起作用。从您的其他容器使用kafka:29092作为代理主机和端口，以及 Zookeeper 的zookeeper:2181。

从本地主机，您可以在 9092 上访问代理(假设您公开端口(。

查看此 docker-compose 以获取完整示例(来自此存储库(