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apache-kafka - Kafka 连接在 docker 中找不到代理

问题描述

我有一个 docker-compose 文件来设置 Kafka 基础设施。问题是，当我第一次在机器上运行 docker-compose 时，所有容器都运行良好，但是当我停止/删除容器并重新运行 docker-compose 时，图像容器“ cnfldemos/cp-server -connect-datagen:0.2.0-5.4.0 "有时会退出。我只是想更新这个问题不是恒定的，我无法找出根本原因。

你能帮我解决上面关于图像容器“ cnfldemos/cp-server-connect-datagen:0.2.0-5.4.0 ”的问题吗？通过查看日志，我了解到存在未知的主机期望，但我不知道它为什么要尝试查找 172.18.0.4 IP。这甚至不是我的IP。

ps 我是 Kafka docker setup 的新手，请帮忙！

以下是来自cnfldemos/cp-server-connect-datagen:0.2.0-5.4.0容器的错误日志。

main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka version: 5.4.0-ccs
[main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka commitId: f4201a82bea68cc7
[main] INFO org.apache.kafka.common.utils.AppInfoParser - Kafka startTimeMs: 1585904457838
[kafka-admin-client-thread | adminclient-1] WARN org.apache.kafka.clients.NetworkClient - [AdminClient clientId=adminclient-1] Connection to node -1 (broker/172.18.0.4:29092) could not be established. Broker may not be available.
[kafka-admin-client-thread | adminclient-1] WARN org.apache.kafka.clients.NetworkClient - [AdminClient clientId=adminclient-1] Connection to node -1 (broker/172.18.0.4:29092) could not be established. Broker may not be available.
[kafka-admin-client-thread | adminclient-1] WARN org.apache.kafka.clients.NetworkClient - [AdminClient clientId=adminclient-1] Connection to node -1 (broker/172.18.0.4:29092) could not be established. Broker may not be available.
[kafka-admin-client-thread | adminclient-1] WARN org.apache.kafka.clients.NetworkClient - [AdminClient clientId=adminclient-1] Error connecting to node broker:29092 (id: -1 rack: null)
java.net.UnknownHostException: broker: Name or service not known
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
        at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
        at java.net.InetAddress.getAllByName(InetAddress.java:1193)
        at java.net.InetAddress.getAllByName(InetAddress.java:1127)
        at org.apache.kafka.clients.ClientUtils.resolve(ClientUtils.java:104)
        at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.currentAddress(ClusterConnectionStates.java:403)
        at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.access$200(ClusterConnectionStates.java:363)
        at org.apache.kafka.clients.ClusterConnectionStates.currentAddress(ClusterConnectionStates.java:151)
        at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:955)
        at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:289)
        at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.sendEligibleCalls(KafkaAdminClient.java:969)
        at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.run(KafkaAdminClient.java:1184)
        at java.lang.Thread.run(Thread.java:748)
[kafka-admin-client-thread | adminclient-1] WARN org.apache.kafka.clients.NetworkClient - [AdminClient clientId=adminclient-1] Error connecting to node broker:29092 (id: -1 rack: null)
java.net.UnknownHostException: broker

以下是 docker-compose.yml 文件。

我使用命令执行以下 docker-compose.yml 文件

 docker-compose up -d  

version: '2.1'

services:

  zookeeper:
    image: confluentinc/cp-zookeeper:5.4.1
    hostname: zookeeper
    container_name: zookeeper
    ports:
      - "2181:2181"
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000


  broker:
    image: confluentinc/cp-server:5.4.1
    hostname: broker
    container_name: broker
    depends_on:
      - zookeeper
    ports:
      - "9092:9092"
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper:2181'
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://broker:29092,PLAINTEXT_HOST://localhost:9092
      KAFKA_METRIC_REPORTERS: io.confluent.metrics.reporter.ConfluentMetricsReporter
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
      KAFKA_CONFLUENT_LICENSE_TOPIC_REPLICATION_FACTOR: 1
      CONFLUENT_METRICS_REPORTER_BOOTSTRAP_SERVERS: broker:29092
      CONFLUENT_METRICS_REPORTER_ZOOKEEPER_CONNECT: zookeeper:2181
      CONFLUENT_METRICS_REPORTER_TOPIC_REPLICAS: 1
      CONFLUENT_METRICS_ENABLE: 'true'
      CONFLUENT_SUPPORT_CUSTOMER_ID: 'anonymous'

  schema-registry:
    image: confluentinc/cp-schema-registry:5.4.1
    hostname: schema-registry
    container_name: schema-registry
    depends_on:
      - zookeeper
      - broker
    ports:
      - "8081:8081"
    environment:
      SCHEMA_REGISTRY_HOST_NAME: schema-registry
      SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: 'zookeeper:2181'

  rest-proxy:
    image: confluentinc/cp-kafka-rest:5.4.1
    depends_on:
      - zookeeper
      - broker
      - schema-registry
    ports:
      - 8082:8082
    hostname: rest-proxy
    container_name: rest-proxy
    environment:
      KAFKA_REST_HOST_NAME: rest-proxy
      KAFKA_REST_BOOTSTRAP_SERVERS: 'broker:29092'
      KAFKA_REST_LISTENERS: "http://0.0.0.0:8082"
      KAFKA_REST_SCHEMA_REGISTRY_URL: 'http://schema-registry:8081'

  kafka-topics-ui:
    image: landoop/kafka-topics-ui:0.9.4
    hostname: kafka-topics-ui
    ports:
      - "8000:8000"
    environment:
      KAFKA_REST_PROXY_URL: "http://rest-proxy:8082/"
      PROXY: "true"
    depends_on:
      - zookeeper
      - broker
      - schema-registry
      - rest-proxy

  connect:
    image: cnfldemos/cp-server-connect-datagen:0.2.0-5.4.0
    hostname: connect
    container_name: connect
    depends_on:
      - zookeeper
      - broker
      - schema-registry
    ports:
      - "8083:8083"
    environment:
      CONNECT_BOOTSTRAP_SERVERS: 'broker:29092'
      CONNECT_REST_ADVERTISED_HOST_NAME: connect
      CONNECT_REST_PORT: 8083
      CONNECT_GROUP_ID: compose-connect-group
      CONNECT_CONFIG_STORAGE_TOPIC: docker-connect-configs
      CONNECT_CONFIG_STORAGE_REPLICATION_FACTOR: 1
      CONNECT_OFFSET_FLUSH_INTERVAL_MS: 10000
      CONNECT_OFFSET_STORAGE_TOPIC: docker-connect-offsets
      CONNECT_OFFSET_STORAGE_REPLICATION_FACTOR: 1
      CONNECT_STATUS_STORAGE_TOPIC: docker-connect-status
      CONNECT_STATUS_STORAGE_REPLICATION_FACTOR: 1
      CONNECT_KEY_CONVERTER: org.apache.kafka.connect.storage.StringConverter
      CONNECT_VALUE_CONVERTER: io.confluent.connect.avro.AvroConverter
      CONNECT_VALUE_CONVERTER_SCHEMA_REGISTRY_URL: http://schema-registry:8081
      CONNECT_INTERNAL_KEY_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
      CONNECT_INTERNAL_VALUE_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
      CONNECT_ZOOKEEPER_CONNECT: 'zookeeper:2181'
      CLASSPATH: /usr/share/java/monitoring-interceptors/monitoring-interceptors-5.4.1.jar
      CONNECT_PRODUCER_INTERCEPTOR_CLASSES: "io.confluent.monitoring.clients.interceptor.MonitoringProducerInterceptor"
      CONNECT_CONSUMER_INTERCEPTOR_CLASSES: "io.confluent.monitoring.clients.interceptor.MonitoringConsumerInterceptor"
      CONNECT_PLUGIN_PATH: "/usr/share/java,/usr/share/confluent-hub-components"
      CONNECT_LOG4J_LOGGERS: org.apache.zookeeper=ERROR,org.I0Itec.zkclient=ERROR,org.reflections=ERROR


docker-compose ps

          Name                       Command            State                     Ports                   
----------------------------------------------------------------------------------------------------------
broker                      /etc/confluent/docker/run   Up      0.0.0.0:9092->9092/tcp                    
connect                     /etc/confluent/docker/run   Up      0.0.0.0:8083->8083/tcp, 9092/tcp          
topics-ui                   /run.sh                     Up      0.0.0.0:8000->8000/tcp                    
rest-proxy                  /etc/confluent/docker/run   Up      0.0.0.0:8082->8082/tcp                    
schema-registry             /etc/confluent/docker/run   Up      0.0.0.0:8081->8081/tcp                    
zookeeper                   /etc/confluent/docker/run   Up      0.0.0.0:2181->2181/tcp, 2888/tcp, 3888/tcp

docker-compose ps 一段时间后输出

          Name                       Command             State                       Ports                   
-------------------------------------------------------------------------------------------------------------
broker                      /etc/confluent/docker/run   Up         0.0.0.0:9092->9092/tcp                    
connect                     /etc/confluent/docker/run   Exit 137                                             
topics-ui                   /run.sh                     Up         0.0.0.0:8000->8000/tcp                    
rest-proxy                  /etc/confluent/docker/run   Up         0.0.0.0:8082->8082/tcp                    
schema-registry             /etc/confluent/docker/run   Up         0.0.0.0:8081->8081/tcp                    
zookeeper                   /etc/confluent/docker/run   Up         0.0.0.0:2181->2181/tcp, 2888/tcp, 3888/tcp

我们可以注意到容器“连接”是退出 137 状态。

标签： apache-kafkadocker-composeapache-kafka-connectconfluent-platform

解决方案

我不知道为什么它试图找到 172.18.0.4 IP。这甚至不是我的IP。

那是您的管理程序 IP。

总的来说，您可能会遇到内存问题，因为您正在连接到正确的地址（实际上CONFLUENT_METRICS_REPORTER_BOOTSTRAP_SERVERS可能localhost:29092是），但是 docker 网络变得不稳定。（运行docker-compose rm -sf并docker system prune进入干净（er）状态）

解决方案

  1. 在设置中增加你的 Docker 内存

  2. 不要运行不需要的容器（REST 代理或主题 UI）

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