kafka 集群搭建步骤
kafka 集群的运行建立在 zookeeper 基础上,kafka 中的消息偏移量信息、kafka 集群信息、topic 等信息会被存储在 zookeeper 中。高版本的 kafka 自带了 zookeeper,本文使用独立的 zookeeper 集群部署 kafka 集群。前期准备见《Linux 环境下,搭建 ZooKeeper 集群》。
一、下载 kafka
kafka 官网:
- http://kafka.apache.org/
- http://kafka.apache.org/downloads
本文下载的是 kafka_2.13-2.8.1.tgz。将上述文件分别上传至三台服务器 10.201.42.03、10.201.42.04、10.201.42.06 的 /home/cpctest 路径下。
分别在三台服务器上解压文件:
[cpctest@vm-10-201-42-03 ~]$ tar -zxvf kafka_2.13-2.8.1.tgz[cpctest@vm-10-201-42-03 ~]$ cd kafka_2.13-2.8.1/
[cpctest@vm-10-201-42-03 kafka_2.13-2.8.1]$ ll
total 48
drwxr-xr-x 3 cpctest app 4096 Sep 14 21:09 bin
drwxr-xr-x 3 cpctest app 4096 Feb 10 15:50 config
drwxr-xr-x 2 cpctest app 8192 Feb 10 14:24 libs
-rw-r--r-- 1 cpctest app 14520 Sep 14 21:03 LICENSE
drwxr-xr-x 2 cpctest app 4096 Sep 14 21:09 licenses
drwxr-xr-x 2 cpctest app 4096 Feb 10 16:00 logs
-rw-r--r-- 1 cpctest app 953 Sep 14 21:03 NOTICE
drwxr-xr-x 2 cpctest app 43 Sep 14 21:09 site-docs
[cpctest@vm-10-201-42-03 kafka_2.13-2.8.1]$ cd config/
[cpctest@vm-10-201-42-03 config]$ ll
total 72
-rw-r--r-- 1 cpctest app 906 Sep 14 21:03 connect-console-sink.properties
-rw-r--r-- 1 cpctest app 909 Sep 14 21:03 connect-console-source.properties
-rw-r--r-- 1 cpctest app 5321 Sep 14 21:03 connect-distributed.properties
-rw-r--r-- 1 cpctest app 883 Sep 14 21:03 connect-file-sink.properties
-rw-r--r-- 1 cpctest app 881 Sep 14 21:03 connect-file-source.properties
-rw-r--r-- 1 cpctest app 2247 Sep 14 21:03 connect-log4j.properties
-rw-r--r-- 1 cpctest app 2540 Sep 14 21:03 connect-mirror-maker.properties
-rw-r--r-- 1 cpctest app 2262 Sep 14 21:03 connect-standalone.properties
-rw-r--r-- 1 cpctest app 1221 Sep 14 21:03 consumer.properties
drwxr-xr-x 2 cpctest app 98 Sep 14 21:03 kraft
-rw-r--r-- 1 cpctest app 4674 Sep 14 21:03 log4j.properties
-rw-r--r-- 1 cpctest app 1925 Sep 14 21:03 producer.properties
-rw-r--r-- 1 cpctest app 7492 Feb 10 15:50 server.properties
-rw-r--r-- 1 cpctest app 1032 Sep 14 21:03 tools-log4j.properties
-rw-r--r-- 1 cpctest app 1169 Sep 14 21:03 trogdor.conf
-rw-r--r-- 1 cpctest app 1205 Sep 14 21:03 zookeeper.properties
二、创建 kafka 数据存放目录
分别在三台服务器的以下路径创建 kafka 的数据存放目录:
[cpctest@vm-10-201-42-03 ~]$ pwd
/home/cpctest
[cpctest@vm-10-201-42-03 ~]$ mkdir kafkalogs
[cpctest@vm-10-201-42-03 ~]$ cd kafkalogs/
[cpctest@vm-10-201-42-03 kafkalogs]$ pwd
/home/cpctest/kafkalogs
三、修改配置文件
在 10.201.42.03 服务器上,编辑 /home/cpctest/kafka_2.13-2.8.1/config/server.properties 文件,编辑后的文件内容如下所示:
# 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=10.201.42.03############################# 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 separated 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=/home/cpctest/kafkalogs# 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 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 excessive 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.
# 每个日志分段文件大小,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=10.201.42.03:2181,10.201.42.04:2181,10.201.42.06:2181# 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
分别将上述文件 server.properties 远程拷贝至服务器 10.201.42.04 和 10.201.42.06:
[cpctest@vm-10-201-42-04 config]$ scp cpctest@10.201.42.03:/home/cpctest/kafka_2.13-2.8.1/config/server.properties .
[cpctest@vm-10-201-42-06 config]$ scp cpctest@10.201.42.03:/home/cpctest/kafka_2.13-2.8.1/config/server.properties .
在 10.201.42.04 上修改 server.properties 文件:
# 每个broker在集群中的唯一标识,不能重复
broker.id=1
# 端口
port=9092
# broker主机地址
host.name=10.201.42.04
在 10.201.42.06 上修改 server.properties 文件:
# 每个broker在集群中的唯一标识,不能重复
broker.id=2
# 端口
port=9092
# broker主机地址
host.name=10.201.42.06
四、启动 kafka 集群
尝试在第一台节点执行如下命令,启动 kafka ,看看是否报错:
[cpctest@vm-10-201-42-03 bin]$ ./kafka-server-start.sh /home/cpctest/kafka_2.13-2.8.1/config/server.properties
启动过程没有报错,分别在三台节点执行如下命令,启动 kafka 集群。-daemon,以后台服务方式启动,后面跟的是配置文件:
[cpctest@vm-10-201-42-03 bin]$ ./kafka-server-start.sh -daemon /usr/local/kafka/kafka_2.11-1.0.0/config/server.properties
查看是否有 kafka 进程:
[cpctest@vm-10-201-42-03 bin]$ jps
26757 jar
26615 Jps
25244 Kafka
24125 QuorumPeerMain
[cpctest@vm-10-201-42-03 bin]$ ps -ef|grep kafka
初步看来,kafka 进程启动成功。集群是否搭建成功,可以进一步使用一些 kafka 的操作命令来验证,例如创建主题命令,可以参考《kafka 常用操作命令》。
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