Zookeeper 集群搭建

      分布式Zookeeper安装步骤：

1. 安装准备

     1.1 下载Zookeeper。下载链接：http://mirrors.hust.edu.cn/apache/zookeeper/

     1.2 解压缩到指定的目录下，比如：/opt/zookeeper下。

     1.3 修改系统的hosts文件，指定域名映射。例如:

192.168.177.167 machine-1
192.168.177.168 machine-2
192.168.177.158 machine-0

      三台机器中都安装Zookeeper服务。

2. 配置zookeeper

       进入配置目录下，具体的命令如下：

[app@machine-1 conf]$ cd /opt/zookeeper/conf

       复制模板配置文件：

[app@machine-1 conf]$ cp zoo_sample.cfg zoo.cfg

      编辑文件：

[app@machine-1 conf]$ vim zoo.cfg 

<span style="font-size:18px;">     
 # 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/zookeeper/data
# the directory where transaction log is stored.
# this parameter provides dedicated log device for ZooKeeper
 dataLogDir=/opt/zookeeper/logs
# the port at which the clients will connect
clientPort=2222
server.1=machine-0:2888:3888
server.2=machine-1:2888:3888
server.3=machine-2:2888:3888
#
# 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</span>

     创建data和logs目录：

    mkdir -p /opt/zookeeper/data
    mkdir -p /opt/zookeeper/logs

3. 将zookeeper实例复制到集群

   #机器machine-1上

     scp  -r /opt/zookeeper machine-0:/opt/
     scp  -r /opt/zookeeper machine-2:/opt/

    添加myid文件到各台机器上，标示序列值不能够重复：

    #一次输入1到225间的某个数，具体操作如下：

   #machine-0
   vim /opt/zookeeper/data/myid
   1
  #machine-1
   vim /opt/zookeeper/data/myid
   2
  #machine-2
   vim /opt/zookeeper/data/myid
  3

      启动各台机器的zookeeper。当然，可以将脚步添加到系统环境下，

直接执行sh脚步更方便，这里就不给出步骤了。

  

 /opt/zookeeper/bin/zkServer.sh start

    上实践本人已经运行成功了，有错误或者不足之处，请指出。

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