Kafka 集群部署（CentOS 单机模拟版）

0.前置说明

由于我们手里只有一台Linux机器，所以我们实现的是简单的单机模拟的集群部署，通过修改配置文件，启动 3 个 kafka 时用到 3 个不同的端口（9091，9092，9093）。

1.安装Java11

1. 切换到你的工作目录下执行：

yum install java-11-openjdk -y
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2. 添加环境变量；

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.23.0.9-3.tl3.x86_64
export PATH=$PATH:$JAVA_HOME/bin
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3. 让你的环境变量生效；

source /etc/profile
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4. 测试是否安装成功；

java -version
openjdk version "11.0.23" 2024-04-16 LTS
OpenJDK Runtime Environment (Red_Hat-11.0.23.0.9-2) (build 11.0.23+9-LTS)
OpenJDK 64-Bit Server VM (Red_Hat-11.0.23.0.9-2) (build 11.0.23+9-LTS, mixed mode, sharing)
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2.集群部署

1. 在你的工作目录下新建目录 cluster（集群）；

mkdir cluster
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2. 进入cluster目录下，下载 kafka 安装包 kafka-3.6.1-src.tgz并解压。

rz -E # 上传本地安装包
tar -zxf kafka_2.12-3.6.1.tgz
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3. 改名为 kafka；

mv kafka_2.12-3.6.1 kafka
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2.1 安装ZooKeeper

1. 修改文件夹名为zookeeper；

因为 kafka 内置了 ZooKeeper 软件，所以此处将解压缩的文件作为 ZooKeeper 软件使用。

mv kafka/ zookeeper
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2. 修改config/zookeeper.properties文件;

cd zookeeper/
vim config/zookeeper.properties 
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• 修改dataDir，zookeeper 数据的存储文件。

# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# the directory where the snapshot is stored.
dataDir=/root/cluster/zookeeper-data/zookeeper
# 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
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2.2 安装Kafka

1. 将上面解压缩的文件复制一份，改名为broke-1；

mv kafka_2.12-3.6.1/ broker-1
ll
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total 8
drwxr-xr-x 7 root root 4096 Nov 24 17:43 broker-1
drwxr-xr-x 7 root root 4096 Nov 24 17:43 zookeeper
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2. 修改config/server.properties配置文件;

vim broker-1/config/server.properties
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############################# Server Basics #############################

# The id of the broker. This must be set to a unique integer for each broker.
broker.id=1 # kafka 节点数字标识，集群内具有唯一性
#......

############################# Socket Server Settings #############################

# The address the socket server listens on. If not configured, the host name will be equal to the value of
# java.net.InetAddress.getCanonicalHostName(), with PLAINTEXT listener name, and port 9092.
#   FORMAT:
#     listeners = listener_name://host_name:port
#   EXAMPLE:
#     listeners = PLAINTEXT://your.host.name:9092
listeners=PLAINTEXT://:9091
#.......
############################# Log Basics #############################

# A comma separated list of directories under which to store log files
log.dirs=/root/cluster/broker-data/broker-1 # 监听器 9091 为本地端口，如果冲突，请重新指定
# .......
############################# Zookeeper #############################

# Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=localhost:2181 # 数据文件路径，如果不存在，会自动创建

# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=18000 # ZooKeeper 软件连接地址，2181 为默认的ZK 端口号 /kafka 为ZK 的管理节点

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3. 同样的步骤，复制一份broker-2 与broker-3，并修改配置文件。

# broker-2
############################# Server Basics #############################

# The id of the broker. This must be set to a unique integer for each broker.
broker.id=2 # kafka 节点数字标识，集群内具有唯一性
#......

############################# Socket Server Settings #############################

# The address the socket server listens on. If not configured, the host name will be equal to the value of
# java.net.InetAddress.getCanonicalHostName(), with PLAINTEXT listener name, and port 9092.
#   FORMAT:
#     listeners = listener_name://host_name:port
#   EXAMPLE:
#     listeners = PLAINTEXT://your.host.name:9092
listeners=PLAINTEXT://:9092
#.......
############################# Log Basics #############################

# A comma separated list of directories under which to store log files
log.dirs=/root/cluster/broker-data/broker-2 # 监听器 9091 为本地端口，如果冲突，请重新指定
# .......
############################# Zookeeper #############################

# Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=localhost:2181 # 数据文件路径，如果不存在，会自动创建

# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=18000 # ZooKeeper 软件连接地址，2181 为默认的ZK 端口号 /kafka 为ZK 的管理节点
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# broker-3
############################# Server Basics #############################

# The id of the broker. This must be set to a unique integer for each broker.
broker.id=3 # kafka 节点数字标识，集群内具有唯一性
#......

############################# Socket Server Settings #############################

# The address the socket server listens on. If not configured, the host name will be equal to the value of
# java.net.InetAddress.getCanonicalHostName(), with PLAINTEXT listener name, and port 9092.
#   FORMAT:
#     listeners = listener_name://host_name:port
#   EXAMPLE:
#     listeners = PLAINTEXT://your.host.name:9092
listeners=PLAINTEXT://:9093
#.......
############################# Log Basics #############################

# A comma separated list of directories under which to store log files
log.dirs=/root/cluster/broker-data/broker-3 # 监听器 9091 为本地端口，如果冲突，请重新指定
# .......
############################# Zookeeper #############################

# Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=localhost:2181 # 数据文件路径，如果不存在，会自动创建

# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=18000 # ZooKeeper 软件连接地址，2181 为默认的ZK 端口号 /kafka 为ZK 的管理节点
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2.3 封装启动脚本

因为 Kafka 启动前，必须先启动 ZooKeeper，并且Kafka集群中有多个节点需要启动，所以启动过程比较繁琐，这里我们将启动的指令进行封装。

1. 在zookeeper文件夹下创建zk.sh批处理文件；

cd zookeeper
vim zk.sh

## zk.sh
./bin/zookeeper-server-start.sh config/zookeeper.properties

chmod +x zk.sh
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2. 在broker-1，broker-2，broker-3文件夹下分别创建kfk.sh批处理文件；

cd broker-1
vim kfk.sh

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

chmod +x kfk.sh
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3. 在cluster文件夹下创建cluster.sh批处理文件，用于启动 kafka 集群。

vim cluster.sh
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# cluster.sh
cd zookeeper
./zk.sh
cd ../broker-1
./kfk.sh
cd ../broker-2
./kfk.sh
cd ../broker-3
./kfk.sh
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chmod +x cluster.sh
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4. 在cluster文件夹下创建cluster-clear.sh批处理文件，用于清理和重置 kafka 数据。

vim cluster-clear.sh

# cluster-clear.sh 
rm -rf zookeeper-data
rm -rf broker-data
                      
chmod +x cluster-clear.sh 
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5. 在cluster目录下，运行./cluster.sh文件即可启动集群。

# 启动集群
./cluster

# 查看是否启动成功，如果新建了data文件，说明启动成功了
ll zookeeper-data/
total 4
drwxr-xr-x 3 root root 4096 May 27 10:20 zookeeper

ll broker-data/
total 12
drwxr-xr-x 2 root root 4096 May 27 10:21 broker-1
drwxr-xr-x 2 root root 4096 May 27 10:21 broker-2
drwxr-xr-x 2 root root 4096 May 27 10:21 broker-3
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6. 当我们想要关闭集群时，不仅要清理 zookeeper 和 kafka 的数据文件，还有kill -9 结束 zookeeper 进程与 kakfa 进程，这需要我们手动逐一kill。

ps axj | grep zookeeper
kill -9 #zookeeper的PID

ps axj | grep kafka
kill -9 #3个kafka节点的PID
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