zookeeper集群搭建

1. 环境信息

   系统：
   centos6.8
   
   IP：
   192.168.57.201、192.168.57.202、192.168.57.203
   
   软件版本：
   zookeeper-3.4.10.tar.gz 、jdk-8u191-linux-x64.tar.gz
   
   软件存放路径：
   /opt/yidian/zookeeper-3.4.10.tar.gz
   /opt/yidian/jdk-8u191-linux-x64.tar.gz
   
   

2. 安装JDK

   解压JDK
   tar -xzvf jdk-8u191-linux-x64.tar.gz
   
   /opt/yidian/jdk1.8.0_191 -- 当前jdk解压路径
   
   配置JDK环境变量（/etc/profile）
   JAVA_HOME=/opt/yidian/jdk1.8.0_191
   PATH=$JAVA_HOME/bin:$PATH
   CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAME_HOME/lib/tools.jar
   export JAVA_HOME
   export PATH
   export CLASSPATH
   
   刷新环境变量
   source /etc/profile
   

3. 安装zookeeper

   解压zookeeper
   tar xzvf zookeeper-3.4.10.tar.gz
   
   修改zookeeper的配置文件
   mv zoo_sample.cfg  zoo.cfg
   
   创建zookeeper的数据目录和日志目录
   /opt/zk/data
   /opt/zk/logs
   
   修改zoo.cfg内容
   # 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/zk/data
   dataLogDir=/opt/zk/logs
   # 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
   
   #2888 选举端口
   #3888 心跳端口
   server.1=test201:2888:3888
   server.2=test202:2888:3888
   server.3=test203:2888:3888        
   
   myid文件内容如下：
   201 /opt/zk/data/myid -- 1
   202 /opt/zk/data/myid -- 2
   203 /opt/zk/data/myid -- 3
   
   修改本地hosts
   192.168.57.201 test201
   192.168.57.202 test202
   192.168.57.203 test203
   

4. 集群启动测试

   启动目录
   /opt/yidian/zookeeper-3.4.10/bin
   
   分别启动3台机器的zookeeper
   ./zkServer.sh start
   
   查看集群的状态
   ./zkServer.sh status
   
   #显示如下信息，代表集群环境搭建成功！
   [root@test201 bin]# ./zkServer.sh status
   ZooKeeper JMX enabled by default
   Using config: /opt/yidian/zookeeper-3.4.10/bin/../conf/zoo.cfg
   Mode: follower
   
   [root@test202 bin]# ./zkServer.sh status
   ZooKeeper JMX enabled by default
   Using config: /opt/yidian/zookeeper-3.4.10/bin/../conf/zoo.cfg
   Mode: leader
   
   
   

   视频教程：http://www.yidiankt.com/course/subject/51

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