Zookeeper 分布式环境搭建

一、前期环境

• 安装概览

IP	Host Name	Software
192.168.23.128	ae01	JDK 1.7
192.168.23.129	ae02	JDK 1.7
192.168.23.130	ae03	JDK 1.7

若使用虚拟机安装，可以安装samba, smbfs方便对于文件的控制。

• 系统环境： ubuntu-12.04.2-server-amd64
• 安装目录： /usr/local/ae
• JDK 安装目录： export JAVA_HOME=/usr/local/ae/jdk1.7.0_51
• Zookeeper版本： zookeeper-3.4.5

二、Zookeeper 安装

• 修改host文件，添加3台服务器的hostname， 以ae01 为例。
  

  user@ae01:/usr/local/ae$ sudo vim /etc/hosts

  127.0.0.1         localhost
  192.168.23.128    ae01
  192.168.23.129    ae02
  192.168.23.129    ae03

• 解压zookeeper-3.4.5.tar.gz 到/usr/local/ae 目录
  

  user@ae01:/usr/local/ae$ sudo tar -zxvf zookeeper-3.4.5.tar.gz

• 复制$ZOOKEEPER_HOME/conf/zoo_sample.cfg 为zoo.cfg 并修改
  

  user@ae01:/usr/local/ae/zookeeper-3.4.5/conf$ sudo vm zoo_sample.cfg zoo.cfg

• 修改zoo.cfg
  

  # The number of milliseconds of each tick
  tickTime=2000
  # The number of ticks that the initial 
  # synchronization phase can take
  initLimit=5
  # The number of ticks that can pass between 
  # sending a request and getting an acknowledgement
  syncLimit=2
  # the directory where the snapshot is stored.
  # do not use /tmp for storage, /tmp here is just 
  # example sakes.
  dataDir=/usr/local/ae/storage/zookeeper
  # the port at which the clients will connect
  clientPort=2181
  #
  # 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=ae01:2888:3888
  server.2=ae02:2888:3888
  server.3=ae03:2888:3888

  dataDir 为Zookeeper保存数据的文件夹
  server.1=ae01:2888:3888 '2888'为连接所使用的端口号，'3888'为选举leader使用的端口号

• 复制zookeeper-3.4.5 到ae02，ae03
  

  user@ae01:/usr/local/ae$ scp -r zookeeper-3.3.5/ user@ae01:/usr/local/ae
  user@ae01:/usr/local/ae$ scp -r zookeeper-3.3.5/ user@ae02:/usr/local/ae

• 设置myid
  

  user@ae01:/usr/local/ae$ echo "1" > /usr/local/ae/storage/zookeeper/myid
  user@ae02:/usr/local/ae$ echo "2" > /usr/local/ae/storage/zookeeper/myid
  user@ae03:/usr/local/ae$ echo "3" > /usr/local/ae/storage/zookeeper/myid

  myid的值对应着上文中 server.x 的参数

三、启动Zookeeper 集群

• 启动Zookeeper
  

  user@ae01:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start
  user@ae02:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start
  user@ae03:/usr/local/ae/zookeeper-3.4.5/bin$ sudo zkServer.sh start

  由于ZooKeeper集群启动的时候，每个结点都试图去连接集群中的其它结点，先启动的肯定连不上后面还没启动的，日志前面部分出现连接异常（java.net.ConnectException: Connection refused ）是可以忽略的。集群在选出一个Leader后，最后稳定了。

• 验证启动
  

  user@ae01:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
  JMX enabled by default
  Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
  Mode: leader

  user@ae02:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
  JMX enabled by default
  Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
  Mode: follower

  user@ae03:/usr/local/ae/zookeeper-3.4.5/bin$ zkServer.sh status
  JMX enabled by default
  Using config: /usr/local/ae/zookeeper-3.4.5/bin/../conf/zoo.cfg
  Mode: follower

四、文档参考

• http://zookeeper.apache.org/doc/trunk/zookeeperOver.html