kafka zookeeper 集群搭建

kafka zookeeoer 集群准备

（一）节点配置

host配置

编辑节点/etc/hosts 文件，分发至每个节点

echo "192.168.101.131   z1" >> /etc/hosts
echo "192.168.101.132   z2" >> /etc/hosts
echo "192.168.101.133   z3" >> /etc/hosts
echo "192.168.101.141   k1" >> /etc/hosts
echo "192.168.101.142   k2" >> /etc/hosts
echo "192.168.101.143   k3" >> /etc/hosts

（二）zookeeper

1. 配置java环境（jdk1.8以上）
   yum install java 或者手动配置java环境

2. 安装 yum install -y zookeeper

3. 修改配置文件
   进入z1、z2、z3节点的zookeeper配置目录，例如/opt/zookeeper/conf/zoo.cfg
   添加配置

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
dataDir=/var/lib/zookeeper/data
# the port at which the clients will connect
clientPort=2181

server.1=z1:2888:3888
server.2=z2:2888:3888
server.3=z3:2888:3888

4. 添加myid
   在上面配置dataDir对应的目录下新建文件myid，在z1节点中写如数字1，z2节点中写入数字2，z3节点中写入数字3
   z1节点 mkdir -p /var/lib/zookeeper/data/ && echo 1 > /var/lib/zookeeper/data/myid
   z2节点 mkdir -p /var/lib/zookeeper/data/ && echo 2 > /var/lib/zookeeper/data/myid
   z3节点 mkdir -p /var/lib/zookeeper/data/ && echo 3 > /var/lib/zookeeper/data/myid
5. 启动zookeeper
   z1、z2、z3节点启动zookeeper服务 /opt/zookeeper/bin/zkServer.sh start /opt/zookeeper/conf/zoo.cfg
6. 查询节点状态 /opt/zookeeper/bin/zkServer.sh status

（三）kafka(3.7.2)

采用官网下载安装包的方法

1. 下载解压
   wget -P /usr/local/ https://mirrors.tuna.tsinghua.edu.cn/apache/kafka/3.7.2/kafka_2.12-3.7.2.tgz
tar -zxvf /usr/local/kafka_2.12-3.7.2.tgz -C /usr/local
2. 配置软连接
   ln -s /usr/local/kafka_2.12-3.7.2 /usr/local/kafka
3. 更改用户权限（根据生产环境配置）
   mkdir -p /data/kafka-logs
chown 用户:组 -R /data/kafka-logs
chown 用户:组 -R /usr/local/kafka_2.12-3.7.2
4. 配置环境变量（可选，将kafka可执行文件加入PATH）
   echo "export KAFKA_HOME=/usr/local/kafka" >> /etc/profile
echo "export PATH=\$PATH:\$KAFKA_HOME/bin" >> /etc/profile
source /etc/profile

# /etc/profile
...
export KAFKA_HOME=/usr/local/kafka
export PATH=$PATH:$KAFKA_HOME/bin

5. 修改kafka配置
   配置server.properties 文件
   编辑config/server.properties 文件，修改broker.id和zookeeper.connect的值

• 节点k1
  sed -i 's/broker\.id.*/broker.id=1/' /usr/local/kafka/config/server.properties
sed -i 's/zookeeper.connect=.*/zookeeper.connect=z1:2181,z2:2181,z3:2181/' /usr/local/kafka/config/server.properties

• 节点k2
  sed -i 's/broker\.id.*/broker.id=2/' /usr/local/kafka/config/server.properties
sed -i 's/zookeeper.connect=.*/zookeeper.connect=z1:2181,z2:2181,z3:2181/' /usr/local/kafka/config/server.properties

• 节点k3
  sed -i 's/broker\.id.*/broker.id=3/' /usr/local/kafka/config/server.properties
sed -i 's/zookeeper.connect=.*/zookeeper.connect=z1:2181,z2:2181,z3:2181/' /usr/local/kafka/config/server.properties

配置完成后，每个节点只有broker.id不同，例如k1的配置如下

...
broker.id=1
...
zookeeper.connect=z1:2181,z2:2181,z3:2181
...

6. 启动kafka

• 后台启动kafka: sh /usr/local/kafka/bin/kafka-server-start.sh -daemon /usr/local/kafka/config/server.properties

前台启动（测试用） sh /usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties
停止kafka sh /usr/local/kafka/bin/kafka-server-stop.sh

（四）Topic

创建topic
kafka-topics.sh --bootstrap-server k1:9092 --create --topic topic-a --partitions 3 --replication-factor 2

列出topic
kafka-topics.sh --bootstrap-server k1:9092 --list

描述topic
kafka-topics.sh --bootstrap-server k1:9092 --describe --topic topic-a

Topic: topic-a  TopicId: OXC_ux10Taq314OyL-dU9Q PartitionCount: 3       ReplicationFactor: 3    Configs: 
        Topic: topic-a  Partition: 0    Leader: 143     Replicas: 143,142,141   Isr: 143,142,141
        Topic: topic-a  Partition: 1    Leader: 142     Replicas: 142,141,143   Isr: 142,141,143
        Topic: topic-a  Partition: 2    Leader: 141     Replicas: 141,143,142   Isr: 141

每个分区都有一个Leader，负责处理对该分区的读写请求
每个分区都有三个副本，分布在不同的Broker上

删除topic
kafka-topics.sh --bootstrap-server k1:9092 --delete --topic topic-a

修改topic
kafka-topics.sh --bootstrap-server k1:9092 --alter --topic topic-a --partitions 4

（五）生产消费

• 生产者命令
  kafka-console-producer.sh --bootstrap-server k1:9092 --topic topic-a
• 消费者命令 --from-beginning 从头消费数据
  kafka-console-consumer.sh --bootstrap-server k1:9092 --topic topic-a --from-beginning
• 指定分区，并且消费历史数据
  kafka-console-consumer.sh --bootstrap-server k1:9092 --topic topic-a --from-beginning --partition 2