ZooKeeper简介见官方网站。
　　1.环境说明
　　在两台装有centos6.4（32位）的server上安装ZooKeeper，官网建议至少3个节点。资源有限，本次实验2台了。
　　须要提前安装jdk。选择的版本号是jdk-6u27-linux-i586.bin，下载地址：http://pan.baidu.com/s/1mgICcFA
　　2.配置主机名和ip映射的关系。
　　ZooKeeper集群全部的结点作为一个总体对分布式应用提供服务。因此须要各个节点实现互连，要知道其它节点的主机和ip的映射关系。在每一个节点上配置/etc/hosts文件，加入例如以下：
　　192.168.1.67 MasterServer
　　192.168.1.241 SlaveServer
　　3.安装ZooKeeper
　　1）下载ZooKeeper，建议选择稳定版，即stable的。
　　wget http://apache.dataguru.cn/zookeeper/stable/zookeeper-3.4.6.tar.gz
　　2）解压
　　tar -zxvf zookeeper-3.4.6.tar.gz
　　3）改动/etc/profile，加入ZooKeeper路径
　　export ZOOKEEPER_HOME=/home/hadooper/hadoop/zookeeper-3.4.6
　　export PATH=$ZOOKEEPER_HOME/bin:$ZOOKEEPER_HOME/conf:$PATH
　　4）新建zoo.cfg并改动
cp conf/zoo_sample.cfg conf/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=/home/hadooper/hadoop/zookeeper-3.4.6/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=MasterServer:2888:3888
server.2=SlaveServer:2888:3888