阿里云kafka安装

本案例使用的是kafka的版本是kafka_2.11-0.9.0.1，zookeeper的版本是zookeeper-3.4.6，jdk1.7.0_79 来安装一个简单测试环境。

一、安装启动zookeeper

1 . 去官网下载zookeeper-3.4.6.tar.gz
2 . 解压文件，设置zookeeper环境变量（ZOOKEEPER_HOME）
设置完后的etc/profile文件部分内容如下：

JAVA_HOME=/usr/java/jdk1.7.0_79JRE_HOME=/usr/java/jdk1.7.0_79/jreCLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/libexport JAVA_HOME JRE_HOME PATH CLASSPATHexport MAVEN_HOME=/usr/maven/apache-maven-3.5.0export PATH=${MAVEN_HOME}/bin:${PATH}export ZOOKEEPER_HOME=/usr/zookeeper/zookeeper-3.4.6export PATH=${ZOOKEEPER_HOME}/bin:${PATH}export PATH

别忘了，立即生效执行的命令： source /etc/profile
3 . 修改zookeeper文件下config目录下zoo_sample.cfg为zoo.cfg(下载完默认的端口号就是2181)
4 . 启动zookeeper cd /home/usr/zookeeper/zookeeper-3.4.6/bin(zookeeper的安装目录)

JMX enabled by defaultUsing config: /root/hadoop-0.20.2/zookeeper-3.3.1/bin/../conf/zoo.cfgStarting zookeeper ...STARTED

查看zookeeper占用的进程ID
ps -ef|grep zookeeper
如果现实这样代表启动成功

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二、安装启动kafka

1. 去官网下载kafka_2.11-0.9.0.1.tgz
2. 解压文件，解压目录为: /home/kafka/kafka_2.11-0.9.0.1，修改config/server.properties内容为：

# 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.broker.id=0############################# Socket Server Settings #############################listeners=PLAINTEXT://:9092# The port the socket server listens onport=9092# Hostname the broker will bind to. If not set, the server will bind to all interfaceshost.name=x.x.x.x# Hostname the broker will advertise to producers and consumers. If not set, it uses the# value for "host.name" if configured.  Otherwise, it will use the value returned from# java.net.InetAddress.getCanonicalHostName().advertised.host.name=x.x.x.x# The port to publish to ZooKeeper for clients to use. If this is not set,# it will publish the same port that the broker binds to.#advertised.port=<port accessible by clients># The number of threads handling network requestsnum.network.threads=3# The number of threads doing disk I/Onum.io.threads=8# The send buffer (SO_SNDBUF) used by the socket serversocket.send.buffer.bytes=102400# The receive buffer (SO_RCVBUF) used by the socket serversocket.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 fileslog.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# 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.#    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 deletionlog.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.#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 policieslog.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=localhost:2181# Timeout in ms for connecting to zookeeperzookeeper.connection.timeout.ms=6000

其中需要注意的参数配置为：host.name=阿里云的内网地址，advertised.host.name=阿里云的外网地址。

3 . 启动kafka，进去bin目录，输入命令：
./kafka-server-start.sh ../config/server.properties
需要注意：因为我阿里云这台服务器内存配置比较低，需要修改kafka-server-start.sh里的内容。export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G" -> export KAFKA_HEAP_OPTS="-Xmx512M -Xms512M"

4 .正常启动后，显示INFO KafkaConfig values: …, ps -ef|grep kafka

代表启动成功。

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三、kafka创建topic简单测试

1. 不要关闭kafka服务，再开启一个终端，创建topic。
   ./kafka-topics.sh –create –zookeeper localhost:2181 –replication-factor 1 –partitions 1 –topic test
2. 查看所有topic列表
   ./kafka-topics.sh –list –zookeeper localhost:2181
   这是会显示出test
3. 查看单个topic的详情
   ./kafka-topics.sh –describe –zookeeper localhost:2181 –topic test
4. product测试发送消息
   在该终端上输入：
   /kafka-console-producer.sh –broker-list localhost:9092 –topic test
   
   每一个回车命令就是向kafka发送一条数据，该案列发送了2条数据。
5. consumer测试接受消息
   再另开一个终端，输入：
   ./kafka-console-consumer.sh –zookeeper localhost:2181 –topic test –from-beginning
   
   可以看到接受到了最新的2条消息。

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四、手动删除topic

1. 删除kafka存储目录（server.properties文件log.dirs配置，默认为”/tmp/kafka-logs”）相关topic目录
2. 如果kafaka启动时加载的配置文件中server.properties没有配置delete.topic.enable=true，那么此时的删除并不是真正的删除，而是把topic标记为：marked for deletion
3. 登录zookeeper客户端：命令 cd zookeeperHome/bin ./zkCli.sh
4. 找到topic所在的目录：ls /brokers/topics
5. 找到要删除的topic，执行命令：rmr /brokers/topics/test 即可，此时topic被彻底删除。（此处删除的是元数据）