[英]Can't connect to kafka docker container from another docker container
我正在尝试从另一个 docker 容器连接到 kafka docker 容器。 但它没有连接。
网络kafka-docker_default有两个容器kafka-docker_zookeeper_1和kafka-docker_kafka0_1
为了运行 kafka 和 zookeeper,我使用了 docker-compose 文件:
version: '2'
services:
zookeeper:
image: "confluentinc/cp-zookeeper:latest"
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
# This has three listeners you can experiment with.
# BOB for internal traffic on the Docker network
# FRED for traffic from the Docker-host machine (`localhost`)
# ALICE for traffic from outside, reaching the Docker host on the DNS name `never-gonna-give-you-up`
# Use
kafka0:
image: "confluentinc/cp-kafka"
ports:
- '9092:9092'
- '29094:29094'
depends_on:
- zookeeper
environment:
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
KAFKA_LISTENERS: LISTENER_BOB://kafka0:29092,LISTENER_FRED://kafka0:9092,LISTENER_ALICE://kafka0:29094
KAFKA_ADVERTISED_LISTENERS: LISTENER_BOB://kafka0:29092,LISTENER_FRED://localhost:9092,LISTENER_ALICE://never-gonna-give-you-up:29094
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_BOB:PLAINTEXT,LISTENER_FRED:PLAINTEXT,LISTENER_ALICE:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_BOB
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
容器dockercompose17138956372294708100_kafkatest.producer_1和dockercompose17138956372294708100_kafkatest.consumer_1用于生产和消费消息。 当容器dockercompose17138956372294708100_kafkatest.producer_1尝试使用 bootstrap.servers 参数(localhost:9092 或 never-gonna-give-you-up:29094)连接到 kafka 集群时,它显示错误
%7|1569945335.015|BROKERFAIL|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: failed: err: Local: Host resolution failure: (errno: Bad address)
%3|1569945335.015|FAIL|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Failed to resolve 'never-gonna-give-you-up:29094': Name or service not known (after 1656ms in state CONNECT)
%3|1569945335.015|ERROR|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Failed to resolve 'never-gonna-give-you-up:29094': Name or service not known (after 1656ms in state CONNECT)
%7|1569945335.015|STATE|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: never-gonna-give-you-up:29094/bootstrap: Broker changed state CONNECT -> DOWN
%3|1569945335.015|ERROR|rdkafka#producer-1| [thrd:never-gonna-give-you-up:29094/bootstrap]: 1/1 brokers are down
我该如何解决?
dockercompose17138956372294708100_kafkatest.producer_1 正在尝试使用
bootstrap.servers
参数(localhost:9092
或never-gonna-give-you-up:29094
)连接到 kafka 集群
从另一个 Docker 容器中,这些都不正确。
在您的 Docker 配置中, never-gonna-give-you-up
在任何地方都不存在作为主机名/DNS 记录。 根据错误,您的外部 DNS 服务器也不知道那是什么
localhost
指的是 Kafka 客户端容器,而不是您的主机或代理容器。
根据您的 compose 配置,您需要连接到kafka0
主机/服务,它在bootstrap.servers
的端口29092上公布
# BOB for internal traffic on the Docker network
KAFKA_ADVERTISED_LISTENERS: LISTENER_BOB://kafka0:29092
您还应该删除 LISTENER_ALICE 因为它没有提供任何有用的连接详细信息,除非您的主机的外部主机名实际上是never-gonna-give-you-up
你会想把你的生产者和消费者作为你的撰写文件的一部分
请尝试以下配置:
version: '3'
services:
zookeeper:
image: confluentinc/cp-zookeeper:latest
ports:
- "32181:32181"
environment:
ZOOKEEPER_CLIENT_PORT: 32181
ZOOKEEPER_TICK_TIME: 2000
kafka0:
image: confluentinc/cp-kafka:latest
ports:
- "9090:9090"
depends_on:
- zookeeper
environment:
KAFKA_ZOOKEEPER_CONNECT: zookeeper:32181
KAFKA_ADVERTISED_LISTENERS: LISTENER_INTERNAL://kafka0:29090,LISTENER_EXTERNAL://localhost:9090
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_INTERNAL:PLAINTEXT,LISTENER_EXTERNAL:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_INTERNAL
KAFKA_AUTO_CREATE_TOPICS_ENABLE: "false"
使用此配置,如果您从主机连接到代理的容器,则使用 IP localhost:9090
。 如果您从具有相同网络的其他容器连接,则使用kafka0:29090
。
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