Kafka安装和简单使用

安装准备

首先安装zookeeper和scala

安装Zookeeper

下载解压（先安装一台），修改配置文件zoo.cfg

[[email protected] conf]# cp zoo_sample.cfg zoo.cfg
[[email protected] conf]# 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/software/zookeeper/data

# the port at which the clients will connect
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
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

server.1=hadoop001:2888:3888
server.2=hadoop002:2888:3888
server.3=hadoop003:2888:3888

主要添加dataDir和三个server。
然后创建data文件夹，创建myid文件，三台机器都要有

[[email protected] conf]# cd ../
[[email protected] zookeeper]#  mkdir data
[[email protected] zookeeper]# touch data/myid
[[email protected] zookeeper]# echo 1 > data/myid

hadoop002/003，使用scp命令复制整个zookeeper文件夹过去，并修改myid文件

[[email protected] software]# scp -r  zookeeper 192.168.204.202:/opt/software/
[[email protected] software]# scp -r  zookeeper 192.168.204.203:/opt/software/

[[email protected] zookeeper]# echo 2 > data/myid
[[email protected] zookeeper]# echo 3 > data/myid

启动Zookeeper集群

[[email protected] bin]# ./zkServer.sh start
[[email protected] bin]# ./zkServer.sh start
[[email protected] bin]# ./zkServer.sh start

查看状态： ./zkServer.sh status

安装Scala

下载解压，配置环境变量

部署Kafka

下载解压，创建logs目录和修改server.properties

[[email protected] kafka]# mkdir logs
[[email protected] kafka]# cd config/
[[email protected] config]# vi server.properties
broker.id=1
port=9092
host.name=192.168.204.201
log.dirs=/opt/software/kafka/logs
zookeeper.connect=192.168.204.201:2181,192.168.204.202:2181,192.168.204.203:2181/kafka

修改以上几处（没有则添加），并配置环境变量
对另外两台做同样操作（注意修改broker.id和host.name对应的值）

启动/停止

启动（三台都启动）
 nohup kafka-server-start.sh config/server.properties &

停止
bin/kafka-server-stop.sh

简单使用

创建topic

bin/kafka-topics.sh --create \
--zookeeper 192.168.204.201:2181,192.168.204.202:2181,192.168.204.203:2181/kafka \
--replication-factor 3 --partitions 3 --topic test

上面的参数通过 kafka-topics.sh --help可以查看
创建之后，启动Producer测试：（broker-list指的是kafka，不是zookeeper）

bin/kafka-console-producer.sh \
--broker-list 192.168.204.201:9092,192.168.204.202:9092,192.168.204.203:9092 --topic test

在另一个终端，启动Consumer，并订阅Topic中生产的消息

bin/kafka-console-consumer.sh \
--zookeeper 192.168.204.201:2181,192.168.204.202:2181,192.168.204.203:2181/kafka \
--from-beginning --topic test

在生产者终端里，输入信息，然后回车，消费者终端如果接收到这些信息，说明部署Kafka成功。

其他

Kafka的元数据存放在zookeeper上。
kafka数据存放在磁盘上。