从 Docker (ksqlDB) 连接到主机上的 Kafka [英] Connect to Kafka on host from Docker (ksqlDB)

问题描述

我从这里找到的 docker-compor 运行 ksqldb-server https://ksqldb.io/quickstart.html#quickstart-content

I'm running ksqldb-server from a docker-compor found here https://ksqldb.io/quickstart.html#quickstart-content

我的 kafka 引导服务器在同一个 VM 上以标准单独模式运行.我可以使用控制台消费者查看一个主题中的消息:

My kafka bootstrap server is running on the same VM in standard alone mode. I can see the messages in one topic with a console consumer:

sudo kafka-avro-console-consumer --from-beginning --bootstrap-server localhost:9092 --topic source-air-input  --property print.key=true --max-messages 2 

不幸的是，从 docker 运行 ksql 给了我这个错误.

Unfortunatly running ksql from docker gives me this error.

ksqldb-server    | [2021-07-15 23:12:58,772] ERROR Failed to start KSQL (io.confluent.ksql.rest.server.KsqlServerMain:66)
ksqldb-server    | java.lang.RuntimeException: Failed to get Kafka cluster information
ksqldb-server    |      at io.confluent.ksql.services.KafkaClusterUtil.getKafkaClusterId(KafkaClusterUtil.java:107)
ksqldb-server    |      at io.confluent.ksql.rest.server.KsqlRestApplication.buildApplication(KsqlRestApplication.java:624)
ksqldb-server    |      at io.confluent.ksql.rest.server.KsqlServerMain.createExecutable(KsqlServerMain.java:152)
ksqldb-server    |      at io.confluent.ksql.rest.server.KsqlServerMain.main(KsqlServerMain.java:59)
ksqldb-server    | Caused by: java.util.concurrent.TimeoutException
ksqldb-server    |      at org.apache.kafka.common.internals.KafkaFutureImpl$SingleWaiter.await(KafkaFutureImpl.java:108)
ksqldb-server    |      at org.apache.kafka.common.internals.KafkaFutureImpl.get(KafkaFutureImpl.java:272)
ksqldb-server    |      at io.confluent.ksql.services.KafkaClusterUtil.getKafkaClusterId(KafkaClusterUtil.java:105)

我的 docker-compose.yml 如下.

My docker-compose.yml is the following.

 ---
version: '3.9'

services:
  ksqldb-server:
    image: confluentinc/ksqldb-server:0.18.0
    hostname: ksqldb-server
    container_name: ksqldb-server
    extra_hosts:
      - "host.docker.internal:host-gateway"
    ports:
      - "8088:8088"
    environment:
      KSQL_LISTENERS: http://0.0.0.0:8088
      KSQL_BOOTSTRAP_SERVERS: host.docker.internal:9092
      KSQL_KSQL_LOGGING_PROCESSING_STREAM_AUTO_CREATE: "true"
      KSQL_KSQL_LOGGING_PROCESSING_TOPIC_AUTO_CREATE: "true"

  ksqldb-cli:
    image: confluentinc/ksqldb-cli:0.18.0
    container_name: ksqldb-cli
    depends_on:
      - ksqldb-server
    entrypoint: /bin/sh
    tty: true

我尝试了许多可能的地址配置，但都没有成功.可能有什么问题?我尝试了这个问题的建议 从 Docker 容器内部，我如何连接到机器的本地主机? 没有成功.

I tried many possible configurations for the address without success. What might be wrong? I tried the suggestions from this question From inside of a Docker container, how do I connect to the localhost of the machine? without success.

推荐答案

修改Kafka的server.properties

listeners=PLAINTEXT_DOCKER://:29092,PLAINTEXT_LOCAL://localhost:9092

advertised.listeners=PLAINTEXT_DOCKER://host.docker.internal:29092,PLAINTEXT_LOCAL://localhost:9092

listener.security.protocol.map=PLAINTEXT_DOCKER:PLAINTEXT,PLAINTEXT_LOCAL:PLAINTEXT
inter.broker.listener.name=PLAINTEXT_LOCAL

像这样更新你的 Compose 指向主机而不是它自己

Update your Compose like so to point at the host rather than itself

version: '3.9'

services:
  ksqldb-server:
    image: confluentinc/ksqldb-server:0.18.0
    hostname: ksqldb-server
    container_name: ksqldb-server
    ports:
      - "8088:8088"
    extra_hosts:
      - "host.docker.internal:host-gateway"
    environment:
       KSQL_BOOTSTRAP_SERVERS: host.docker.internal:29092
       ...

(在 Mac 上测试)，获取 KSQL 的 /info 端点

(Tested on Mac), Getting /info endpoint of KSQL

http :8088/info
HTTP/1.1 200 OK
content-length: 133
content-type: application/json

{
    "KsqlServerInfo": {
        "kafkaClusterId": "ZH2-h1W_SaivCW0qa8DQGA",
        "ksqlServiceId": "default_",
        "serverStatus": "RUNNING",
        "version": "0.18.0"
    }
}

这篇关于从 Docker (ksqlDB) 连接到主机上的 Kafka的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！