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kafka的Docker镜像使用说明(wurstmeister/kafka)
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kafka的Docker镜像使用说明(wurstmeister/kafka)
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- 在hub.docker.com网站上,Star最多的kafka镜像是wurstmeister/kafka,今天一起来实践这个镜像,使用此镜像搭建kafka环境,并且生产和消费消息;
- 操作系统:CentOS7
- Docker:17.03.2-ce
- docker-compose:1.23.2
编写docker-compose.yml
- wurstmeister在github开源了一份docker-compose.yml,在使用中遇到以下两个问题:
- kafka的配置使用了参数"build: .",因此启动时会在本地构建镜像,构建过程中有的网站访问超时,导致镜像构建失败;
- docker-compose.yml中环境变量的配置,在消费消息时会出现异常"LEADER_NOT_AVAILABLE";
- 针对上述问题,我对原有的docker-compose.yml做了修改和调整,本次实战用到的docker-compose.yml内容如下:
version: '2'
services:
zookeeper:
image: wurstmeister/zookeeper
ports:
- "2181:2181"
kafka:
image: wurstmeister/kafka:2.11-0.11.0.3
ports:
- "9092"
environment:
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://:9092
KAFKA_LISTENERS: PLAINTEXT://:9092
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- 上面有个数据卷参数**/var/run/docker.sock**,这是个很重要的参数,使得容器内可以执行docker ps、docker port等命令,得到的结果和在宿主机上执行一样,详情请参考《docker的/var/run/docker.sock参数》
启动server
- 在docker-compose.yml所在的文件夹下,执行命令docker-compose up -d,会先下载zookeeper和kafka的镜像,然后创建容器;
- 执行命令docker ps,可见启动了一个zookeeper和一个kafka容器:
[root@hedy kafka-docker]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ac99c60be2e3 wurstmeister/kafka:2.11-0.11.0.3 "start-kafka.sh" 5 seconds ago Up 3 seconds 0.0.0.0:32773->9092/tcp kafka-docker_kafka_1
0a26b6c4119e wurstmeister/zookeeper "/bin/sh -c '/usr/..." 5 seconds ago Up 3 seconds 22/tcp, 2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp kafka-docker_zookeeper_1
- 由上面的命令可知kafka容器名称是kafka-docker_kafka_1,zookeeper容器名称是kafka-docker_zookeeper_1;
查看版本号
- 执行以下命令查看容器中的kafka版本号:
docker exec kafka-docker_kafka_1 find / -name \*kafka_\* | head -1 | grep -o '\kafka[^\n]*'
- 上述命令执行后,我这边控制台显示kafka_2.11-0.11.0.3,这表示Scala 的版本为2.11,kafka的版本是0.11.0.3;
- 执行以下命令查看zookeeper版本:
docker exec kafka-docker_zookeeper_1 pwd
- 上述命令执行后,我这边控制台显示**/opt/zookeeper-3.4.9**,这表示zookeeper的版本为3.4.9;
扩展broker
- 在docker-compose.yml所在的文件夹下,执行以下命令即可将borker总数从1个扩展到4个:
docker-compose scale kafka=4
- 执行命令docker ps,可见kafka容器已经扩展到4个:
[root@hedy kafka-docker]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
adf18015a95e kafka-docker_kafka "start-kafka.sh" 6 seconds ago Up 3 seconds 0.0.0.0:32771->9092/tcp kafka-docker_kafka_2
d7eb1a9c9c72 kafka-docker_kafka "start-kafka.sh" 6 seconds ago Up 3 seconds 0.0.0.0:32770->9092/tcp kafka-docker_kafka_4
0dddf1728ebd kafka-docker_kafka "start-kafka.sh" 6 seconds ago Up 4 seconds 0.0.0.0:32769->9092/tcp kafka-docker_kafka_3
19bc31339915 wurstmeister/zookeeper "/bin/sh -c '/usr/..." 23 minutes ago Up 23 minutes 22/tcp, 2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp kafka-docker_zookeeper_1
11bbf5c6ebec kafka-docker_kafka "start-kafka.sh" 23 minutes ago Up 23 minutes 0.0.0.0:32768->9092/tcp kafka-docker_kafka_1
- 接下来实战消息的生产和消费;
创建topic
- 创建一个topic,名为topic001,4个partition,副本因子2,执行以下命令即可:
docker exec kafka-docker_kafka_1 \
kafka-topics.sh \
--create --topic topic001 \
--partitions 4 \
--zookeeper zookeeper:2181 \
--replication-factor 2
- 执行以下命令查看刚刚创建的topic,这次在容器kafka-docker_kafka_3上执行命令试试:
[root@hedy kafka-docker]# docker exec kafka-docker_kafka_3 \
kafka-topics.sh --list \
--zookeeper zookeeper:2181 \
topic001
- 可见刚刚创建的topic可以被查到;
- 查看刚刚创建的topic的情况,borker和副本情况一目了然,如下:
[root@hedy kafka-docker]# docker exec kafka-docker_kafka_3 \
> kafka-topics.sh \
> --describe \
> --topic topic001 \
> --zookeeper zookeeper:2181
Topic:topic001 PartitionCount:4 ReplicationFactor:2 Configs:
Topic: topic001 Partition: 0 Leader: 1002 Replicas: 1002,1003 Isr: 1002,1003
Topic: topic001 Partition: 1 Leader: 1003 Replicas: 1003,1004 Isr: 1003,1004
Topic: topic001 Partition: 2 Leader: 1004 Replicas: 1004,1001 Isr: 1004,1001
Topic: topic001 Partition: 3 Leader: 1001 Replicas: 1001,1002 Isr: 1001,1002
- 执行如下命令,即可进入等待topic为topic001消息的状态:
docker exec kafka-docker_kafka_2 \
kafka-console-consumer.sh \
--topic topic001 \
--bootstrap-server kafka-docker_kafka_1:9092,kafka-docker_kafka_2:9092,kafka-docker_kafka_3:9092,kafka-docker_kafka_4:9092
- 目前还没有生产消息,因此控制台不会有内容输出,接下来尝试生产消息;
- 打开一个新的窗口,执行如下命令,进入生产消息的命令行模式,注意不要漏掉参数"-it",我之前就是因为漏掉了参数"-it",导致生产的消息时虽然不提示异常,但是始终无法消费到消息:
docker exec -it kafka-docker_kafka_1 \
kafka-console-producer.sh \
--topic topic001 \
--broker-list kafka-docker_kafka_1:9092,kafka-docker_kafka_2:9092,kafka-docker_kafka_3:9092,kafka-docker_kafka_4:9092
-
现在已经进入了生产消息的命令行模式,输入一些字符串然后回车,再去消费消息的控制台窗口看看,已经有消息打印出来,说明消息的生产和消费都成功了;
-
至此,镜像wurstmeister/kafka的实战就完成了,在后续使用到kafka服务的时候,可以参考本次实战快速搭建kafka集群;
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