概述

集群安装或者单机安装都可以，这里介绍集群安装。Kafka本身安装包也自带了zookeeper，也可以使用其自带的zookeeper。建议试用自己安装的zookeeper，本教程试用单独安装的zookeeper。

安装环境

3台centos7虚拟机：10.15.21.62 10.10.182.168 10.10.182.169
kafka_2.10-0.10.2.0
zookeeper-3.4.9
jdk-1.8.0(安装不做赘述)

环境初始化

定义目录结构。

mkdir /opt/zookeeper
mkdir /opt/zkdata
mkdir /opt/zkdatalog
mkdir /opt/kafka

下载软件

cd /opt/zookeeper
wget https://mirrors.cnnic.cn/apache/zookeeper/zookeeper-3.4.9/zookeeper-3.4.9.tar.gz
cd /opt/kafka/
wget http://mirror.bit.edu.cn/apache/kafka/0.10.2.0/kafka_2.10-0.10.2.0.tgz

Zookeeper集群搭建

1. 修改配置文件

    cd /opt/zookeeper/
    tar –xvf  zookeeper-3.4.9.tar.gz
    cd zookeeper-3.4.9/conf
    cp zoo_sample.cfg zoo.cfg
    vi zoo.cfg

# 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.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/opt/zookeeper/zkdata
dataLogDir=/opt/zookeeper/zkdatalog
# the port at which the clients will connect
clientPort=2181
server.1=zk1:2888:3888
server.2=zk2:2888:3888
server.3=zk3:2888:3888
# the maximum number of client connections.
# increase this if you need to handle more clients

server.1 这个1是服务器的标识也可以是其他的数字， 表示这个是第几号服务器，用来标识服务器，这个标识后续会用到。
第一个端口是master和slave之间的通信端口，默认是2888，第二个端口是leader选举的端口。默认3888。
修改完成后，保存即可。
server1:

    echo "1" > /opt/zookeeper/zkdata/myid

server2：

    echo "2" > /opt/zookeeper/zkdata/myid

server3:

    echo "3" > /opt/zookeeper/zkdata/myid

3.启动服务并查看
依次启动服务然后再查看服务状态

cd /opt/zookeeper/zookeeper-3.4.9/bin
    ./zkServer.sh start
    ./zkServer.sh status

Kafka集群搭建

1. 修改配置文件

cd /opt/kafka/kafka_2.10-0.10.2.0/config/
vi server.config

# The id of the broker. This must be set to a unique integer for each broker.
broker.id=1 #当前机器在集群中的唯一标识

# Switch to enable topic deletion or not, default value is false
delete.topic.enable=true

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

# The address the socket server listens on. It will get the value returned from 
# java.net.InetAddress.getCanonicalHostName() if not configured.
#   FORMAT:
#     listeners = listener_name://host_name:port
#   EXAMPLE:
#     listeners = PLAINTEXT://your.host.name:9092
listeners=PLAINTEXT://10.15.21.62:9092 #监听端口

# Hostname and port the broker will advertise to producers and consumers. If not set, 
# it uses the value for "listeners" if configured.  Otherwise, it will use the value
# returned from java.net.InetAddress.getCanonicalHostName().
advertised.listeners=PLAINTEXT://10.15.21.62:9092 #提供给生产者，消费者的端口号。可以不设置则使用listeners的值

# Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details
#listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL

# The number of threads handling network requests
num.network.threads=4

# The number of threads doing disk I/O
num.io.threads=30

# The send buffer (SO_SNDBUF) used by the socket server
socket.send.buffer.bytes=102400

# The receive buffer (SO_RCVBUF) used by the socket server
socket.receive.buffer.bytes=102400

# The maximum size of a request that the socket server will accept (protection against OOM)
socket.request.max.bytes=104857600


############################# Log Basics #############################

# A comma seperated list of directories under which to store log files
log.dirs=/tmp/kafka-logs

# The default number of log partitions per topic. More partitions allow greater
# parallelism for consumption, but this will also result in more files across
# the brokers.
num.partitions=1#默认的分区数

# The number of threads per data directory to be used for log recovery at startup and flushing at shutdown.
# This value is recommended to be increased for installations with data dirs located in RAID array.
num.recovery.threads.per.data.dir=1

############################# Log Flush Policy #############################

# Messages are immediately written to the filesystem but by default we only fsync() to sync
# the OS cache lazily. The following configurations control the flush of data to disk.
# There are a few important trade-offs here:
#    1. Durability: Unflushed data may be lost if you are not using replication.
#    2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.
#   Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to exceessive seeks.
# The settings below allow one to configure the flush policy to flush data after a period of time or
# every N messages (or both). This can be done globally and overridden on a per-topic basis.

# The number of messages to accept before forcing a flush of data to disk
#log.flush.interval.messages=10000

# The maximum amount of time a message can sit in a log before we force a flush
#log.flush.interval.ms=1000

############################# Log Retention Policy #############################

# The following configurations control the disposal of log segments. The policy can
# be set to delete segments after a period of time, or after a given size has accumulated.
# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens
# from the end of the log.

# The minimum age of a log file to be eligible for deletion due to age
log.retention.hours=168

# A size-based retention policy for logs. Segments are pruned from the log as long as the remaining
# segments don't drop below log.retention.bytes. Functions independently of log.retention.hours.
#log.retention.bytes=1073741824

# The maximum size of a log segment file. When this size is reached a new log segment will be created.
log.segment.bytes=1073741824

# The interval at which log segments are checked to see if they can be deleted according
# to the retention policies
log.retention.check.interval.ms=300000

############################# 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= zk1:2181,zk2:2181,zk3:2181 #zookeeper连接地址
# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=6000

1. 启动kafka集群并测试
   在集群每个主机内执行：

cd /opt/kafka/kafka_2.10-0.10.2.0/bin/
./kafka-server-start.sh -daemon ../config/server.properties

1. 验证是否安装成功
   任意一台主机创建一个topic

./kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test

在一台主机上启动消费者消费消息

./kafka-console-consumer.sh --zookeeper zk1:2181,zk2:2181,zk3:2181 --topic test

在另一一台主机上发布消息

./kafka-console-producer.sh --broker-list 10.15.21.62:9092,10.10.182.168:9092,10.10.182.169:9092 --topic test

输入要发布的信息，并按回车。
将会看到消费者消费了消息。说明安装成功。