Question

我已在Docker的fig.yml文件中配置了Zookeeper和Kafka容器。两个容器都很好。但是在发送了许多消息后，我的application / zk-client挂起了。在检查zookeeper日志时，我看到错误：

Error Path:/brokers Error:KeeperErrorCode = NoNode for /brokers

我的figlyml如下：

zookeeper:
  image: wurstmeister/zookeeper
  ports:
    - "2181:2181"
  environment:
    ZK_ADVERTISED_HOST_NAME: xx.xx.x.xxx
    ZK_CONNECTION_TIMEOUT_MS: 6000
    ZK_SYNC_TIME_MS: 2000
    ZK_DATADIR: /path/to/data/zk/data/dir
kafka:
  image: wurstmeister/kafka:0.8.2.0
  ports:
    - "xx.xx.x.xxx:9092:9092"
  links:
    - zookeeper:zk
  environment:
    KAFKA_ADVERTISED_HOST_NAME: xx.xx.x.xxx
    KAFKA_LOG_DIRS: /home/svc_cis4/dl
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock

我已经搜索了很长一段时间，但我还没有找到解决方案。我也尝试使用ZK_DATADIR设置fig.yml中的数据目录：'/ path / to / zk / data / dir'但它似乎没有帮助。任何帮助将不胜感激。

更新

/opt/kafka_2.10-0.8.2.0/config/server.properties的内容：

broker.id=0
port=9092
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
num.partitions=1
num.recovery.threads.per.data.dir=1
log.retention.hours=168
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
log.cleaner.enable=false
zookeeper.connect=localhost:2181
zookeeper.connection.timeout.ms=6000

Answer 1

您遇到的问题与zookeeper的数据目录无关。错误Error Path:/brokers Error:KeeperErrorCode = NoNode for /brokers是由于您的应用程序在zookeeper的数据中找不到任何代理znode。发生这种情况可能是因为kafka容器没有与zookeeper正确连接，并且期待wurstmeister的图像我认为问题可能与变量KAFKA_ADVERTISED_HOST_NAME有关可能是错误的。我不知道是否有理由通过必须传递的env变量来分配该变量，但从我的观点来看，这不是一个好方法。有多种方法可以配置kafka（实际上不需要设置advertised.host.name，你可以留下它注释，kafka将采用默认主机名，可以使用docker设置），但使用它的快速解决方案是编辑start-kafka.sh并重建图像：

#!/bin/bash

if [[ -z "$KAFKA_ADVERTISED_PORT" ]]; then
    export KAFKA_ADVERTISED_PORT=$(docker port `hostname` 9092 | sed -r "s/.*:(.*)/\1/g")
fi
if [[ -z "$KAFKA_BROKER_ID" ]]; then
    export KAFKA_BROKER_ID=$KAFKA_ADVERTISED_PORT
fi
if [[ -z "$KAFKA_LOG_DIRS" ]]; then
    export KAFKA_LOG_DIRS="/kafka/kafka-logs-$KAFKA_BROKER_ID"
fi
if [[ -z "$KAFKA_ZOOKEEPER_CONNECT" ]]; then
    export KAFKA_ZOOKEEPER_CONNECT=$(env | grep ZK.*PORT_2181_TCP= | sed -e 's|.*tcp://||' | paste -sd ,)
fi

if [[ -n "$KAFKA_HEAP_OPTS" ]]; then
    sed -r -i "s/^(export KAFKA_HEAP_OPTS)=\"(.*)\"/\1=\"$KAFKA_HEAP_OPTS\"/g" $KAFKA_HOME/bin/kafka-server-start.sh
    unset KAFKA_HEAP_OPTS
fi

for VAR in `env`
do
  if [[ $VAR =~ ^KAFKA_ && ! $VAR =~ ^KAFKA_HOME ]]; then
    kafka_name=`echo "$VAR" | sed -r "s/KAFKA_(.*)=.*/\1/g" | tr '[:upper:]' '[:lower:]' | tr _ .`
    env_var=`echo "$VAR" | sed -r "s/(.*)=.*/\1/g"`
    if egrep -q "(^|^#)$kafka_name=" $KAFKA_HOME/config/server.properties; then
        sed -r -i "s@(^|^#)($kafka_name)=(.*)@\2=${!env_var}@g" $KAFKA_HOME/config/server.properties #note that no config values may contain an '@' char
    else
        echo "$kafka_name=${!env_var}" >> $KAFKA_HOME/config/server.properties
    fi
  fi
done

###NEW###
IP=$(hostname --ip-address)
sed -i -e "s/^advertised.host.name.*/advertised.host.name=$IP/" $KAFKA_HOME/config/server.properties
###END###

$KAFKA_HOME/bin/kafka-server-start.sh $KAFKA_HOME/config/server.properties

如果这不能解决您的问题，您可以获取更多信息，在容器内启动会话（例如：docker exec -it kafkadocker_kafka_1 /bin/bash代表kafka，docker exec -it kafkadocker_zookeeper_1 /bin/bash代表zookeeper's），并检查kafka日志或zookeeper控制台（/opt/zookeeper-3.4.6/bin/zkCli.sh）

Answer 2

过去两天一直没有任何问题的配置涉及为Zookeeper和Kafka指定主机地址。我的fig.yml内容为：

zookeeper:
  image: wurstmeister/zookeeper
  ports:
    - "xx.xx.x.xxx:2181:2181"
kafka:
  image: wurstmeister/kafka:0.8.2.0
  ports:
    - "9092:9092"
  links:
    - zookeeper:zk
  environment:
     KAFKA_ADVERTISED_HOST_NAME: xx.xx.x.xxx
     KAFKA_NUM_REPLICA_FETCHERS: 4
     ...other env variables...
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock
validator:
  build: .
  volumes:
    - .:/host
  entrypoint: /bin/bash
  command: -c 'java -jar /host/app1.jar'
  links:
    - zookeeper:zk
    - kafka
analytics:
  build: .
  volumes:
    - .:/host
  entrypoint: /bin/bash
  command: -c 'java -jar /host/app2.jar'
  links:
    - zookeeper:zk
    - kafka
loader:
  build: .
  volumes:
    - .:/host
  entrypoint: /bin/bash
  command: -c 'java -jar /host/app3.jar'
  links:
    - zookeeper:zk
    - kafka

随附的Dockerfile内容：

FROM ubuntu:trusty

MAINTAINER Wurstmeister

RUN apt-get update; apt-get install -y unzip openjdk-7-jdk wget git docker.io

RUN wget -q http://apache.mirrors.lucidnetworks.net/kafka/0.8.2.0/kafka_2.10-0.8.2.0.tgz -O /tmp/kafka_2.10-0.8.2.0.tgz
RUN tar xfz /tmp/kafka_2.10-0.8.2.0.tgz -C /opt

VOLUME ["/kafka"]

ENV KAFKA_HOME /opt/kafka_2.10-0.8.2.0
ADD start-kafka.sh /usr/bin/start-kafka.sh
ADD broker-list.sh /usr/bin/broker-list.sh
CMD start-kafka.sh

如何在Docker中设置Zookeeper dataDir（fig.yml）

2 个答案: