jdk+zookeeper+kafka 搭建kafka集群

环境准备

环境资源包：
jdk-8u341-linux-x64.tar.gz
kafka_2.12-2.2.0.tgz
zookeeper-3.4.14.tar.gz

server-id	ip	状态
server1	10.206.120.10	leader
server2	10.206.120.2	follower
server3	10.206.120.3	follower

一、安装jdk

因为kafka需要Java环境，所以优先配置jdk环境，若已经配置了java环境，此步骤可以忽略

[root@VM-120-2-centos ~]# tar -xvf jdk-8u341-linux-x64.tar.gz 
[root@VM-120-2-centos ~]# mv jdk1.8.0_341/ /usr/local/
#在文件末尾加入以下语句
[root@VM-120-2-centos ~]# vim /etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_341
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib

[root@VM-120-2-centos ~]# source /etc/profile
[root@VM-120-2-centos ~]# java -version
java version "1.8.0_341"
Java(TM) SE Runtime Environment (build 1.8.0_341-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.341-b10, mixed mode)
至此jdk环境配置完成

二、zookeeper集群安装

[root@VM-120-2-centos ~]#  cd 
[root@VM-120-2-centos ~]# tar -xvf zookeeper-3.4.14.tar.gz 
[root@VM-120-2-centos ~]# mv zookeeper-3.4.14 /usr/local/zookeeper
[root@VM-120-2-centos ~]# cd /usr/local/zookeeper/conf/
[root@VM-120-2-centos ~]# cp zoo_sample.cfg zoo.cfg
[root@VM-120-2-centos ~]# vim zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataLogDir=/usr/local/zookeeper/logs
dataDir=/usr/local/zookeeper/data
clientPort=2181
autopurge.snapRetainCount=500
autopurge.purgeInterval=24
server.1= 10.206.120.10:2888:3888
server.2= 10.206.120.2:2888:3888
server.3= 10.206.120.2:2888:3888
[root@VM-120-2-centos ~]# mkdir /usr/local/zookeeper/data
#10.206.120.10服务器上执行
[root@VM-120-2-centos ~]# echo "1" > /usr/local/zookeeper/data/myid 

#10.206.120.2服务器上执行       
[root@VM-120-2-centos ~]# echo "2" > /usr/local/zookeeper/data/myid

#10.206.120.3服务器上执行       
[root@VM-120-2-centos ~]# echo "3" > /usr/local/zookeeper/data/myid
[root@VM-120-2-centos ~]# cd ../bin/
[root@VM-120-2-centos ~]# ./zkServer.sh start
[root@VM-120-2-centos ~]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Mode: leader
[root@VM-120-2-centos ~]# netstat -ntlp
看看端口是否正常启动

二、kafka集群安装

[root@VM-120-2-centos ~]# cd 
[root@VM-120-2-centos ~]# tar -xvf kafka_2.12-2.2.0.tgz 
[root@VM-120-2-centos ~]# mv kafka_2.12-2.2.0 /usr/local/kafka
[root@VM-120-2-centos ~]# cd /usr/local/kafka/config/
[root@VM-120-2-centos ~]# cp server.properties server.properties.bak
#10.206.120.2服务器上将以下内容写入文件
[root@VM-120-2-centos ~]# vim server.properties
broker.id=2
listeners=PLAINTEXT://10.206.120.2:9092
advertised.listeners=PLAINTEXT://43.137.8.225:9092
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=204857600
log.dirs=/usr/local/kafka/logs
num.partitions=1
num.recovery.threads.per.data.dir=1
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1
log.retention.hours=1680
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
zookeeper.connect=10.206.120.2:2181,10.206.120.10:2181
zookeeper.connection.timeout.ms=6000
group.initial.rebalance.delay.ms=10
max.poll.interval.ms=800000
max.poll.records=50

#10.206.120.10服务器上将以下内容写入文件
[root@VM-120-2-centos ~]# vim server.properties
broker.id=1
listeners=PLAINTEXT://10.206.120.10:9092
advertised.listeners=PLAINTEXT://118.195.137.101:9092
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=204857600
log.dirs=/usr/local/kafka/logs
num.partitions=1
num.recovery.threads.per.data.dir=1
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1
log.retention.hours=1680
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
zookeeper.connect=10.206.120.2:2181,10.206.120.10:2181
zookeeper.connection.timeout.ms=6000
group.initial.rebalance.delay.ms=10
max.poll.interval.ms=800000
max.poll.records=50

#10.206.120.3服务器上将以下内容写入文件
[root@VM-120-2-centos ~]# vim server.properties
broker.id=3
listeners=PLAINTEXT://10.206.120.3:9092
advertised.listeners=PLAINTEXT://175.27.146.204:9092
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=204857600
log.dirs=/usr/local/kafka/logs
num.partitions=1
num.recovery.threads.per.data.dir=1
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1
log.retention.hours=1680
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
zookeeper.connect=10.206.120.2:2181,10.206.120.10:2181
zookeeper.connection.timeout.ms=6000
group.initial.rebalance.delay.ms=10
max.poll.interval.ms=800000
max.poll.records=50

[root@VM-120-2-centos ~]# cd ../bin/
[root@VM-120-2-centos ~]# nohup ./kafka-server-start.sh ../config/server.properties &

#查看9092端口是否启动，启动即为正常
[root@VM-120-10-centos bin]# netstat -ntlp  

#下面所有命令在kafka的bin目录下执行（笔者是/usr/local/kafka/bin）
#创建topic话题
./kafka-topics.sh --create --bootstrap-server 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 --replication-factor 3 --topic test --partitions 3
#开启一个生产者
./kafka-console-producer.sh --broker-list 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 --topic test
#开启一个消费者
./kafka-console-consumer.sh --bootstrap-server 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 --topic test --from-beginning
#列出所有topic
./kafka-topics.sh --zookeeper 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 -list
#输出某个topic
./kafka-topics.sh --zookeeper 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 --delete --topic test
#详细描述某个topic
./kafka-topics.sh --zookeeper 10.206.120.10:2181,10.206.120.2:2181,10.206.120.3:2181 --describe --topic test

至此集群搭建成功，可以正常使用了

四、测试

外网测试

#1、上传测试压缩包并解压如下图1
#2、更改application.yml将ip更改为集群主机的外网ip
spring:
  application:
    name: kafka-tester
  kafka:
    bootstrap-servers:
      - 10.206.120.3:9092
      - 10.206.120.2:9092
      - 10.206.120.10:9092
    producer:
      topic: test
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
    consumer:
      topic: test
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer

#3、 后台启动kafka测试包
nohup ./test.sh &

#4、开启一个消费者，查看jar包生产结果图2（说明kafka-test.jar包启动正常，kafka集群工作正常）
/usr/local/kafka/bin/kafka-console-consumer.sh --bootstrap-server 175.27.146.204:9092,118.195.137.101:9092,43.137.8.225:9092 --topic test --from-beginning

#5、查看consumer_offsets只有一个副本数图三
/usr/local/kafka/bin/kafka-topics.sh --zookeeper 175.27.146.204:2181,118.195.137.101:2181,43.137.8.225:2181 --describe --topic __consumer_offsets

将集群中的一个follower关机，模拟服务器宕机
结果发现消息队列出现问题（kafka集群不可用）

将服务器启动，并将zookeeper和kafka集群启动，此时集群才正常

故当__consumer_offsets副本数设置为1时，若服务器宕机了，则kafka集群无法正常使用，服务器启动，并将zookeeper和kafka集群启动，此时集群才正常

解决方案

1.修改系统_offsets副本数为3
修改kafka的核心配置文件server.properties
将num.partitions参数（默认为1）修改为3,
offsets.topic.replication.factor=3(默认为1)
另外需要添加auto.create.topics.enable=true

由于__consumer_offsets是kafka默认的主题，无法删除，我们可以删除zookeeper中的__consumer_offsets。
进入zookeeper/bin目录执行./zkCli.sh
ls /broksers/topics
rmr /brokers/topics/__consumer_offsets
ls /broksers/topics

先将集群停掉
在重新启动zookeeper和kafka
再次查看__consumer_offsets。发现副本数已经是3

将集群中的一个follower关机，模拟服务器宕机
消费队列正常

cd /usr/local/zookeeper/bin/
./zkServer.sh start

cd /usr/local/kafka/bin/
nohup ./kafka-server-start.sh …/config/server.properties &

./kafka-topics.sh --zookeeper 175.27.146.204:2181,118.195.137.101:2181,43.137.8.225:2181 --describe --topic __consumer_offsets