一直听说过kafka跟rabbitmq，redis相似，但是没试过，今天特意抽了点时间学习下kafka集群搭建，了解下。
1.环境准备
3台虚拟机（1C4G）
192.168.77.31 zk-1
192.168.77.32 zk-2
192.168.77.33 zk-3
通过官网下载好安装包.
安装kafka集群，需要先安装zookeeper，这里也一并把zookeeper集群也装了一遍。
2.安装过zookeeper集群
1. 安装jdk1.8，并设置环境变量加载
echo 'export JAVA_HOME=/usr/java/jdk1.8.0_181-amd64/' >>/etc/profile
echo 'export PATH=$JAVA_HOME/bin:$PATH' >>/etc/profile
echo 'export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar' >>/etc/profile
source /etc/profile
2. 安装zookeeper
#安装zookeeper
tar -xf ./zookeeper-3.4.14.tar.gz -C /opt && ln -s /opt/zookeeper-3.4.14/ /usr/local/zookeeper
cd /usr/local/zookeeper/conf
mv ./zoo_sample.cfg zoo.cfg
修改配置文件
tickTime=2000
initLimit=10
syncLimit=5
dataLogDir=/opt/zookeeper/logs
dataDir=/opt/zookeeper/data
clientPort=2181
autopurge.snapRetainCount=500
autopurge.purgeInterval=24
#对应机器的ip设置为0.0.0.0
server.1= 192.168.77.31:2888:3888
server.2= 192.168.77.32:2888:3888
server.3= 192.168.77.33:2888:3888
#创建相关目录，三台节点都需要
mkdir -p /opt/zookeeper/{logs,data}
创建ServerID标识，每台机器的ServerID都不一致
echo "1" > /opt/zookeeper/data/myid
#添加环境变量
sed -i '$aexport PATH=$PATH:/usr/local/zookeeper/bin' /etc/profile
#刷新环境变量
source /etc/profile
zkServer.sh start
#查看zk集群状态
zkServer.sh status
3.安装kafka集群
tar -xf kafka_2.12-2.3.0.tgz -C /usr/local/
cd /usr/local/kafka_2.12-2.3.0/config/
修改server.properties文件
config/server.properties:
broker.id=0 #id唯一，三台不能重复
listeners=PLAINTEXT://:9092
log.dirs=/tmp/kafka-logs
zookeeper.connect=zk-1:2181,zk-2:2181,zk-3:2181
echo 'export PATH=$PATH:/usr/local/kafka_2.12-2.3.0/bin/' >>/etc/profile
source /etc/profile
后台启动kafka
nohup kafka-server-start.sh /usr/local/kafka_2.12-2.3.0/config/server.properties &
启动后查看进程是否启动完成
一些常用的kafka命令
Create a topic
kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test
replication-factor 复制印子1
partitions 分区
列出主题
kafka-topics.sh --list --bootstrap-server localhost:9092
查询topic内容：
Send some messages
kafka-console-producer.sh --broker-list localhost:9092 --topic test
Now create a new topic with a replication factor of three:
kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 3 --partitions 1 --topic my-replicated-topic
Okay but now that we have a cluster how can we know which broker is doing what? To see that run the "describe topics" command:
kafka-topics.sh --describe --bootstrap-server localhost:9092 --topic my-replicated-topic
消费信息
kafka-console-consumer.sh --bootstrap-server localhost:9092 --from-beginning --topic my-replicated-topic