我在Docker上创建一个3节点Zookeeper和3个节点Kafka群集。我需要将Kafka群集链接到Zookeeper群集。
以下是docker -compose.yml代码 -
version: '2'
services:
zookeeper-1:
image: zookeeper:latest
environment:
ZOOKEEPER_SERVER_ID: 1
ZOOKEEPER_CLIENT_PORT: 22181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_INIT_LIMIT: 5
ZOOKEEPER_SYNC_LIMIT: 2
ZOOKEEPER_SERVERS: localhost:22888:23888;localhost:32888:33888;localhost:42888:43888
zookeeper-2:
image: zookeeper:latest
environment:
ZOOKEEPER_SERVER_ID: 2
ZOOKEEPER_CLIENT_PORT: 32181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_INIT_LIMIT: 5
ZOOKEEPER_SYNC_LIMIT: 2
ZOOKEEPER_SERVERS: localhost:22888:23888;localhost:32888:33888;localhost:42888:43888
zookeeper-3:
image: zookeeper:latest
environment:
ZOOKEEPER_SERVER_ID: 3
ZOOKEEPER_CLIENT_PORT: 42181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_INIT_LIMIT: 5
ZOOKEEPER_SYNC_LIMIT: 2
ZOOKEEPER_SERVERS: localhost:22888:23888;localhost:32888:33888;localhost:42888:43888
kafka1:
image: abc/kafka:latest
hostname: kafka1
network_mode: host
environment:
KAFKA_BROKER_ID: 1
KAFKA_ZOOKEEPER_CONNECT: localhost:22181,localhost:32181,localhost:42181
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:19092
depends_on:
- zookeeper-1
- zookeeper-2
- zookeeper-3
kafka2:
image: abc/kafka:latest
hostname: kafka2
network_mode: host
environment:
KAFKA_BROKER_ID: 2
KAFKA_ZOOKEEPER_CONNECT: localhost:22181,localhost:32181,localhost:42181
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:29092
depends_on:
- zookeeper-1
- zookeeper-2
- zookeeper-3
kafka3:
image: abc/kafka:latest
hostname: kafka3
network_mode: host
environment:
KAFKA_BROKER_ID: 3
KAFKA_ZOOKEEPER_CONNECT: localhost:22181,localhost:32181,localhost:42181
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:39092
depends_on:
- zookeeper-1
- zookeeper-2
- zookeeper-3
当我运行docker-compose命令时,3个节点zookeeper群集成功创建。但是卡夫卡集群不会创建。它仅在命令行 -
上显示以下错误kafka_kafka2_1 exited with code 0
kafka_kafka1_1 exited with code 0
kafka_kafka3_1 exited with code 0
我还添加了用于创建图像的Dockerfile,以下 -
FROM centos:7
MAINTAINER abc@xyz.com
ENV KAFKA_BIN=http://www-eu.apache.org/dist/kafka/0.11.0.2/kafka_2.11-0.11.0.2.tgz
RUN yum install -y wget java-1.8.0-openjdk
&& cd /tmp && wget -q $KAFKA_BIN
&& export K_TAR=/tmp/$(ls kafka* | head -1)
&& mkdir -p /opt/apache/kafka/ && tar -zxf $K_TAR -C /opt/apache/kafka/
&& cd /opt/apache/kafka && ln -s $(ls) current
&& rm -rf $K_TAR
ENV KAFKA_HOME /opt/apache/kafka/current
ENV PATH $PATH:$KAFKA_HOME/bin
ADD resources /home/kafka
RUN groupadd -r kafka
&& useradd -r -g kafka kafka
&& mkdir -p /home/kafka
&& chown -R kafka:kafka /home/kafka
&& chmod -R +x /home/kafka/scripts
&& mkdir -p /var/log/kafka
&& chown -R kafka:kafka /var/log/kafka
&& mkdir -p /etc/kafka
&& chown -R kafka:kafka /etc/kafka
USER kafka
没有任何错误消息。有人可以帮助我调试这个问题,说明为什么Kafka群集没有启动。我无法调试此问题,尤其是因为它仅使用代码0退出并且没有提供错误消息。
首先,您忘了露出Zookeeper端口。其次,Local主机意味着Local主机 - 即使对于Docker容器也是如此。因此,您的Kafka容器将尝试在同一容器中连接到Zookeeper,这是行不通的。
在这里看看它的正确完成方式:https://github.com/confluentinc/cp-docker-images/blob/4.0.x/examples/cp-all-in-in-in-in-one/docker-compose.yml
如果您不喜欢这种方法,则可以在不暴露任何端口的情况下进行操作。为此,在撰写文件的" Zookeeper环境"部分中设置Zookeeper客户端端口:
...
services:
zookeeper:
...
environment:
ZOOKEEPER_CLIENT_PORT: 2181
第二,将您的kafka容器连接到它:
...
kafka:
...
environment:
ZOOKEEPER_SERVERS: zookeeper:2181
使用这种方法,一切都会发生在Docker组成的网络中。
localhost
docker内部指的是容器实例,而不是主机。这是Kafka安装的混淆的主要来源。您需要配置Kafka的听众以宣传另一个主机:端口组合 - 可以从容器内到达的主机。
下面显示了多个经纪人如何完成此操作的示例。图片来源:该示例来自随附有效的Kafka的回购。
version: "3.2"
services:
zookeeper:
image: bitnami/zookeeper:3
ports:
- 2181:2181
environment:
ALLOW_ANONYMOUS_LOGIN: "yes"
kafka-0:
image: bitnami/kafka:2
ports:
- 9092:9092
environment:
KAFKA_CFG_ZOOKEEPER_CONNECT: zookeeper:2181
ALLOW_PLAINTEXT_LISTENER: "yes"
KAFKA_LISTENERS: >-
INTERNAL://:29092,EXTERNAL://:9092
KAFKA_ADVERTISED_LISTENERS: >-
INTERNAL://kafka-0:29092,EXTERNAL://localhost:9092
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: >-
INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: "INTERNAL"
depends_on:
- zookeeper
kafka-1:
image: bitnami/kafka:2
ports:
- 9093:9093
environment:
KAFKA_CFG_ZOOKEEPER_CONNECT: zookeeper:2181
ALLOW_PLAINTEXT_LISTENER: "yes"
KAFKA_LISTENERS: >-
INTERNAL://:29092,EXTERNAL://:9093
KAFKA_ADVERTISED_LISTENERS: >-
INTERNAL://kafka-1:29092,EXTERNAL://localhost:9093
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: >-
INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: "INTERNAL"
depends_on:
- zookeeper
kafka-2:
image: bitnami/kafka:2
ports:
- 9094:9094
environment:
KAFKA_CFG_ZOOKEEPER_CONNECT: zookeeper:2181
ALLOW_PLAINTEXT_LISTENER: "yes"
KAFKA_LISTENERS: >-
INTERNAL://:29092,EXTERNAL://:9094
KAFKA_ADVERTISED_LISTENERS: >-
INTERNAL://kafka-2:29092,EXTERNAL://localhost:9094
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: >-
INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT
KAFKA_INTER_BROKER_LISTENER_NAME: "INTERNAL"
depends_on:
- zookeeper
kafdrop:
image: obsidiandynamics/kafdrop:latest
ports:
- 9000:9000
environment:
KAFKA_BROKERCONNECT: >-
kafka-0:29092,kafka-1:29092,kafka-2:29092
depends_on:
- kafka-0
- kafka-1
- kafka-2
在这里,连接到经纪人的应用程序是kafdrop,但是您将用自己的图像替换它。同样,该示例仅使用一个带有3个经纪人的ZK节点来简短。这应该是一个直接的变化。
您需要在/etc/hosts
中设置适当的主机名,以便能够连接Docker外的Kafka容器:
cat /etc/hosts
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateHosts = false
127.0.0.1 localhost
127.0.0.1 kafka1
127.0.0.1 kafka2
127.0.0.1 kafka3
这是我的工作配置:
version: '2'
services:
zookeeper1:
image: confluentinc/cp-zookeeper:$CP_VERSION
container_name: zookeeper1
hostname: zookeeper1
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_SERVER_ID: 1
ZOOKEEPER_SERVERS: "zookeeper1:22888:23888;zookeeper2:22888:23888;zookeeper3:22888:23888"
ports:
- 2181:2181
volumes:
- ./data/zoo-1/data:/var/lib/zookeeper/data
- ./data/zoo-1/log:/var/lib/zookeeper/log
zookeeper2:
image: confluentinc/cp-zookeeper:$CP_VERSION
container_name: zookeeper2
hostname: zookeeper2
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_SERVER_ID: 2
ZOOKEEPER_SERVERS: "zookeeper1:22888:23888;zookeeper2:22888:23888;zookeeper3:22888:23888"
ports:
- 2182:2181
volumes:
- ./data/zoo-2/data:/var/lib/zookeeper/data
- ./data/zoo-2/log:/var/lib/zookeeper/log
zookeeper3:
image: confluentinc/cp-zookeeper:$CP_VERSION
container_name: zookeeper3
hostname: zookeeper3
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
ZOOKEEPER_SERVER_ID: 3
ZOOKEEPER_SERVERS: "zookeeper1:22888:23888;zookeeper2:22888:23888;zookeeper3:22888:23888"
ports:
- 2183:2181
volumes:
- ./data/zoo-3/data:/var/lib/zookeeper/data
- ./data/zoo-3/log:/var/lib/zookeeper/log
kafka1:
image: confluentinc/cp-kafka:$CP_VERSION
container_name: kafka1
hostname: kafka1
depends_on:
- zookeeper1
- zookeeper2
- zookeeper3
ports:
- 9091:9091
environment:
KAFKA_BROKER_ID: 1
KAFKA_ZOOKEEPER_CONNECT: zookeeper1:2181,zookeeper2:2181,zookeeper3:2181
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,OUTSIDE:PLAINTEXT
KAFKA_LISTENERS: INTERNAL://:29092,OUTSIDE://:9091
KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka1:29092,OUTSIDE://kafka1:9091
KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
KAFKA_LOG_DIRS: /var/lib/kafka/logs
kafka2:
image: confluentinc/cp-kafka:$CP_VERSION
container_name: kafka2
hostname: kafka2
depends_on:
- zookeeper1
- zookeeper2
- zookeeper3
ports:
- 9092:9092
environment:
KAFKA_BROKER_ID: 2
KAFKA_ZOOKEEPER_CONNECT: zookeeper1:2181,zookeeper2:2181,zookeeper3:2181
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,OUTSIDE:PLAINTEXT
KAFKA_LISTENERS: INTERNAL://:29092,OUTSIDE://:9092
KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka2:29092,OUTSIDE://kafka2:9092
KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
KAFKA_LOG_DIRS: /var/lib/kafka/logs
kafka3:
image: confluentinc/cp-kafka:$CP_VERSION
container_name: kafka3
hostname: kafka3
depends_on:
- zookeeper1
- zookeeper2
- zookeeper3
ports:
- 9093:9093
environment:
KAFKA_BROKER_ID: 3
KAFKA_ZOOKEEPER_CONNECT: zookeeper1:2181,zookeeper2:2181,zookeeper3:2181
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,OUTSIDE:PLAINTEXT
KAFKA_LISTENERS: INTERNAL://:29092,OUTSIDE://:9093
KAFKA_ADVERTISED_LISTENERS: INTERNAL://kafka3:29092,OUTSIDE://kafka3:9093
KAFKA_INTER_BROKER_LISTENER_NAME: INTERNAL
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
KAFKA_LOG_DIRS: /var/lib/kafka/logs