新版本的kafka可以不依赖zookeeper，不过目前处于测试阶段，且不支持zookeeper迁移到新本，所以在生产环境还是建议等一等。本文使用的是kafka_2.13-2.8.1.tgz

zookeeper相关的文档可以参考https://zookeeper.apache.org/doc/r3.8.0/zookeeperStarted.html

安装规划

说明 目录
kafka程序目录 /data/src/kafka_2.13-2.8.1
kafka数据目录 /data/kafka-logs
zookeeper数据目录 /data/zookeeper_data

准备

首先需要安装java环境

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sudo apt install -y openjdk-8-jdk-headless
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sudo yum install -y java-1.8.0-openjdk

创建目录

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mkdir /data/kafka-logs -p
mkdir /data/zookeeper_data -p
ln -s /data/src/kafka_2.13-2.8.1 /data/src/kafka

配置zookeeper

修改zookeeper配置

vim config/zookeeper.properties

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dataDir=/data/zookeeper_data
# the port at which the clients will connect
clientPort=2181
# disable the per-ip limit on the number of connections since this is a non-production config
maxClientCnxns=0
# Disable the adminserver by default to avoid port conflicts.
# Set the port to something non-conflicting if choosing to enable this
admin.enableServer=false
# admin.serverPort=8080

tickTime=2000
initLimit=5
syncLimit=2
server.1=10.0.0.31:2888:3888
server.2=10.0.0.32:2888:3888
server.3=10.0.0.33:2888:3888

创建数据目录和集群ID

myid 集群内不能重复的，每台机器设置成不一样的。

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echo 1 > /data/zookeeper_data/myid

启动zookeeper

创建systemd文件(可选)

vim /etc/systemd/system/zookeeper.service

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[Unit]
Description=Zookeeper service
After=network.target

[Service]
Type=simple
User=root
Group=root
ExecStart=/data/src/kafka/bin/zookeeper-server-start.sh /data/src/kafka/config/zookeeper.properties
ExecStop=/data/src/kafka/bin/zookeeper-server-stop.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target

配置kafka

修改配置文件

vim config/server.properties

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broker.id=1                            # 每个节点需要不一样
listeners=PLAINTEXT://10.0.0.31:9092   # IP和你的节点IP保持一致
zookeeper.connect=10.0.0.31:2181,10.0.0.32:2181,10.0.0.33:2181

启动kafka

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

如果报错：
kafka.common.InconsistentClusterIdException: The Cluster ID C4wRULTzSGqNoEAInvubIw doesn’t match stored clusterId Some(eA5rD8rZSUm3EXr2glib2w) in meta.properties. The broker is trying tojoin the wrong cluster. Configured zookeeper.connect may be wrong.

这个时候需要删除kafka的log目录，让程序重新生成

创建systemd配置文件

vim /etc/systemd/system/kafka.service

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[Unit]
Description=Apache Kafka server (broker)
After=network.target zookeeper.service

[Service]
Type=simple
User=root
Group=root
ExecStart=/data/src/kafka/bin/kafka-server-start.sh /data/src/kafka/config/server.properties
ExecStop=/data/src/kafka/bin/kafka-server-stop.sh
Restart=on-failure

[Install]
WantedBy=multi-user.target

测试和使用

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cd /data/src/kafka

# 创建topic
bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic testtopic

# 查看topic list
bin/kafka-topics.sh --zookeeper localhost:2181 --list

# 控制台生产消息
bin/kafka-console-producer.sh --bootstrap-server kafka2:9092 --topic testtopic

# 控制台消费消息
bin/kafka-console-consumer.sh --bootstrap-server kafka3:9092 --topic testtopic --from-beginning