2.kafka集群环境搭建

2.1.集群主机规划

序号	机器名称	ip/mac地址	硬件资源	安装服务
1	cdh1 root/server123	192.168.80.100，00:50:56:2B:5B:EF	cpu：2核 ， 内存：2.5g ，硬盘20g ，网卡：千兆网卡	jdk、zookeeper、kafka
2	cdh2 root/server123	192.168.80.101，00:50:56:39:23:67	cpu：2核 ， 内存：2.5g ，硬盘20g ，网卡：千兆网卡	jdk、zookeeper、kafka
3	cdh3 root/server123	192.168.80.102，00:50:56:3E:3A:0B	cpu：2核 ， 内存：2.5g ，硬盘20g ，网卡：千兆网卡	jdk、zookeeper、kafka

说明：集群主机之间需要配置ssh免密码登录

免密登录参考:https://www.cnblogs.com/luzhanshi/p/13369797.html

安装zookeeper集群

下载zookeeper

#zookeeper官网地址：
    http://zookeeper.apache.org/
    一个分布式协调服务,管理我们的集群
官网提供配置说明:https://zookeeper.apache.org/doc/current/zookeeperStarted.html

上传解压

解压到

/usr/local/zookeeper/:

配置

菜单进入conf目录下面,将zoo_sample.cfg复制一份到本目录并改名为zoo.cfg

 vim编辑该配置文件:

#编辑文件：
    vim zoo.cfg
    
----------------------------------------------------------------------------
# The number of milliseconds of each tick
#时间单元，zk中的所有时间都是以该时间单元为基础，进行整数倍配置(单位是毫秒,下面配置的是2秒)
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
#follower在启动过程中，会从leader同步最新数据需要的最大时间。如果集群规模比较大，可以调大该参数
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
#leader与集群中所有机器进行心跳检查的最大时间。如果超出该时间，某follower没有回应，则说明该follower下线
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
#事务日志输出目录
dataDir=/usr/local/zookeeper/zookeeper-3.4.5-cdh5.14.0/zkdatas

# the port at which the clients will connect
#客户端连接端口
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#需要保留文件数目，默认就是3个
autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#自动清理事务日志和快照文件的频率，这里是1个小时
autopurge.purgeInterval=1

#集群服务器配置，数字1/2/3需要与myid文件一致。右边两个端口，2888表示数据同步和通信端口；3888表示选举端口
server.1=域名1:2888:3888
server.2=域名2:2888:3888
server.3=域名3:2888:3888

上面我的域名设置是my.server1;my.server2;my.server3

创建数据目录和myid

#创建数据存储目录：
    mkdir -p /usr/local/zookeeper/zookeeper-3.4.5-cdh5.14.0/zkdatas 
#创建myid: 
　　cd/usr/local/zookeeper/zookeeper-3.4.5-cdh5.14.0/zkdatas 
　　touch myid
　　并编辑myid内容为1

分发到其它主机节点

注意,下面语句是以我的其他两天服务器主机别名分别是server02和server03为基础

#分发到node02节点，并修改myid内容为2：
     scp -r zookeeper-3.4.5-cdh5.14.0/ server02:$PWD

#分发到node03节点，并修改myid内容为3：
     scp -r zookeeper-3.4.5-cdh5.14.0/ server03:$PWD

启动zookeeper集群

分别在node01/node02/node03节点启动/停止：
    /usr/local/zookeeper/zookeeper-3.4.5-cdh5.14.0/bin/zkServer.sh start/stop

    
#查看集群状态：
    /usr/local/zookeeper/zookeeper-3.4.5-cdh5.14.0/bin/zkServer.sh status

 如果在查看状态的时候出现如下错误:

 出现这个问题有一下几种可能性：

 1.防火墙没有关闭，就是对应的集群端口没有开放，所以各个节点之间没办法通信（zoo.cfg中最后自己配置的内容(包括2888端口和3888端口)以及zookeeper自己的2181端口）； 

 2.zookeeper中conf目录下的zoo.cfg配置文件有问题，查看日志dataLog文件的目录，以及data数据文件的目录是否正确； 

 3.myid文件中的内容是否和zoo.cfg中配

开放上述端口:

再次测试:

 

安装kafka集群

下载kafka

#kafka官网：
http://kafka.apache.org/
http://kafka.apache.org/downloads

上传解压

 

 

 

 

 

 

配置

进入

/usr/local/kafka/kafka_2.11-1.0.0/config

 

 

 

# Licensed to the Apache Software Foundation (ASF) under one or more
# 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.

# see kafka.server.KafkaConfig for additional details and defaults

############################# Server Basics #############################

# The id of the broker. This must be set to a unique integer for each broker.
#每个broker在集群中的唯一标识，不能重复
broker.id=0
#端口
port=9092
#broker主机地址
host.name=server1

############################# 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://:9092

# 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://your.host.name:9092

# 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 that the server uses for receiving requests from the network and sending responses to the network
#broker处理消息的线程数
num.network.threads=3

# The number of threads that the server uses for processing requests, which may include disk I/O
#broker处理磁盘io的线程数
num.io.threads=8

# The send buffer (SO_SNDBUF) used by the socket server
#socket发送数据缓冲区
socket.send.buffer.bytes=102400

# The receive buffer (SO_RCVBUF) used by the socket server
#socket接收数据缓冲区
socket.receive.buffer.bytes=102400

# The maximum size of a request that the socket server will accept (protection against OOM)
#socket接收请求最大值
socket.request.max.bytes=104857600


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

# A comma seperated list of directories under which to store log files
#kafka数据存放目录位置，多个位置用逗号隔开
log.dirs=/usr/local/kafka/kafka_2.11-1.0.0/kfk-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.
#topic默认的分区数
num.partitions=1

# 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.
#恢复线程数
num.recovery.threads.per.data.dir=1

############################# Internal Topic Settings  #############################
# The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state"
# For anything other than development testing, a value greater than 1 is recommended for to ensure availability such as 3.
#默认副本数
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=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.
#    3. 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
#消息日志最大存储时间，这里是7天
log.retention.hours=168

# A size-based retention policy for logs. Segments are pruned from the log unless the remaining
# segments 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.
#每个日志段文件大小，这里是1g
log.segment.bytes=1073741824

# The interval at which log segments are checked to see if they can be deleted according
# to the retention policies
#消息日志文件大小检查间隔时间
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集群地址
zookeeper.connect=server1:2181,server2:2181,server3:2181

# Timeout in ms for connecting to zookeeper
#zookeeper连接超时时间
zookeeper.connection.timeout.ms=6000


############################# Group Coordinator Settings #############################

# The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance.
# The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms.
# The default value for this is 3 seconds.
# We override this to 0 here as it makes for a better out-of-the-box experience for development and testing.
# However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup.
group.initial.rebalance.delay.ms=0

创建数据存储目录

#创建数据存储目录：
    mkdir -p /usr/local/kafka/kafka_2.11-1.0.0/kfk-logs

分发到其它主机节点

先在server2和server3上创建对应目录:

    mkdir -p /usr/local/kafka/kafka_2.11-1.0.0

然后:

#分发到node02节点：
　　
    scp -r /usr/local/kafka/kafka_2.11-1.0.0/ server2:$PWD

#分发到node03节点： 
　　 scp -r /usr/local/kafka/kafka_2.11-1.0.0/ server3:$PWD 

修改其它节点配置文件

#server2节点
cd /usr/local/kafka/kafka_2.11-1.0.0/config

vim server.properties
----------------------------------------------------
# The id of the broker. This must be set to a unique integer for each broker.
broker.id=1
port=9092

#server3节点
cd /usr/local/kafka/kafka_2.11-1.0.0/config

vim server.properties
----------------------------------------------------
# The id of the broker. This must be set to a unique integer for each broker.
broker.id=2
port=9092

启动kafka集群

#分别在三台节点执行：node01/node02/node03
 ##启动kafka集群-daemon(以后台服务方式启动) 后面跟的是以配置文件启动
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-server-start.sh -daemon /usr/local/kafka/kafka_2.11-1.0.0/config/server.properties

 ## 停止kafka集群
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-server-stop.sh

 

查看是否有kafka进程

 

kafka基本使用

交互式命令使用:

 

查看topic

#查看topic 列表：
    /usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-topics.sh --list --zookeeper server1:2181,server2:2181,server3:2181
    
#查看指定topic：
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-topics.sh  --describe --zookeeper server1:2181,server2:2181,server3:2181 --topic itcast_topic
    
#创建topic
# --create：表示创建
# --zookeeper 后面的参数是zk的集群节点
# --replication-factor 1 ：表示复本数
# --partitions 1：表示分区数
# --topic itheima_topic：表示topic的主题名称

/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-topics.sh --create --zookeeper server1:2181,server2:2181,server3:2181 --replication-factor 1 --partitions 1 --topic oc_itheima_topic

#删除topic
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-topics.sh --delete --zookeeper server1:2181,server2:2181,server3:2181 --topic itheima_topic

创建生产者

#创建生产者，生产消息
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-console-producer.sh --broker-list server1:9092,server2:9092,server3:9092 --topic oc_itheima_topic

 

 发送消息:

创建消费者

#创建消费者，消费消息：
/usr/local/kafka/kafka_2.11-1.0.0/bin/kafka-console-consumer.sh --bootstrap-server server1:9092,server2:9092,server3:9092 --topic oc_itheima_topic --consumer-property group.id=my-consumer-g  --partition 0 --offset 0

 

 

 

 

 

 

 

$PWD