从Apache网站上（zookeeper.apache.org）下载ZooKeeper软件包，我选择了3.3.4版本的（zookeeper-3.3.4.tar.gz），在一台Linux机器上安装非常容易，只需要解压缩后，简单配置一下即可以启动ZooKeeper服务器进程。

将zookeeper-3.3.4/conf目录下面的 zoo_sample.cfg修改为zoo.cfg，配置文件内容如下所示

tickTime=2000
dataDir=/home/hadoop/storage/zookeeper
clientPort=2181
initLimit=5
syncLimit=2

tickTime —— the basic time unit in milliseconds used by ZooKeeper. It is used to do heartbeats and the minimum session timeout will be twice the tickTime.
dataDir —— the location to store the in-memory database snapshots and, unless specified otherwise, the transaction log of updates to the database.
clientPort —— the port to listen for client connections

下面启动ZooKeeper服务器进程

cd zookeeper-3.3.4/
bin/zkServer.sh start

通过jps命令可以查看ZooKeeper服务器进程，名称为QuorumPeerMain。

在客户端连接ZooKeeper服务器，执行如下命令

bin/zkCli.sh -server hostname:2181

本机直接执行 bin/zkCli.sh 

[root@rm900dev120 bin]# ./zkCli.sh  
Connecting to localhost:2181
2016-03-24 14:01:05,466 [myid:] - INFO  [main:Environment@109] - Client environment:zookeeper.version=3.5.1-alpha-1693007, built on 07/28/2015 07:19 GMT
2016-03-24 14:01:05,471 [myid:] - INFO  [main:Environment@109] - Client environment:host.name=rm900dev120.pe.com
2016-03-24 14:01:05,471 [myid:] - INFO  [main:Environment@109] - Client environment:java.version=1.8.0_51
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.vendor=Oracle Corporation
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.home=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.51-1.b16.el6_7.x86_64/jre
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.class.path=/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../build/classes:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../build/lib/*.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/slf4j-log4j12-1.7.5.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/slf4j-api-1.7.5.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/servlet-api-2.5-20081211.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/netty-3.7.0.Final.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/log4j-1.2.16.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/jline-2.11.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/jetty-util-6.1.26.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/jetty-6.1.26.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/javacc.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/jackson-mapper-asl-1.9.11.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/jackson-core-asl-1.9.11.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../lib/commons-cli-1.2.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../zookeeper-3.5.1-alpha.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../src/java/lib/*.jar:/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin/../conf:
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.io.tmpdir=/tmp
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:java.compiler=<NA>
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:os.name=Linux
2016-03-24 14:01:05,474 [myid:] - INFO  [main:Environment@109] - Client environment:os.arch=amd64
2016-03-24 14:01:05,475 [myid:] - INFO  [main:Environment@109] - Client environment:os.version=2.6.32-504.12.2.el6.centos.plus.x86_64
2016-03-24 14:01:05,475 [myid:] - INFO  [main:Environment@109] - Client environment:user.name=root
2016-03-24 14:01:05,475 [myid:] - INFO  [main:Environment@109] - Client environment:user.home=/root
2016-03-24 14:01:05,475 [myid:] - INFO  [main:Environment@109] - Client environment:user.dir=/usr/local/hadoop/sbin/zookeeper-3.5.1-alpha/bin
2016-03-24 14:01:05,475 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.free=113MB
2016-03-24 14:01:05,477 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.max=228MB
2016-03-24 14:01:05,477 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.total=119MB
2016-03-24 14:01:05,481 [myid:] - INFO  [main:ZooKeeper@716] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@28ba21f3
Welcome to ZooKeeper!
2016-03-24 14:01:05,533 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1138] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2016-03-24 14:01:05,614 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@980] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:58493, server: localhost/0:0:0:0:0:0:0:1:2181
[zk: localhost:2181(CONNECTING) 0] 2016-03-24 14:01:05,723 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1400] - Session establishment complete on server localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x100fb428f3a0000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

[zk: localhost:2181(CONNECTED) 0] 
[zk: localhost:2181(CONNECTED) 0] 

[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
addauth scheme auth
close 
config [-c] [-w] [-s]
connect host:port
create [-s] [-e] [-c] path [data] [acl]
delete [-v version] path
deleteall path
delquota [-n|-b] path
get [-s] [-w] path
getAcl [-s] path
history 
listquota path
ls [-s] [-w] path
ls2 path [watch]
printwatches on|off
quit 
reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]
redo cmdno
removewatches path [-c|-d|-a] [-l]
rmr path
set [-s] [-v version] path data
setAcl [-s] [-v version] path acl
setquota -n|-b val path
stat [-w] path
sync path

ZooKeeper分布式模式安装（ZooKeeper集群）也比较容易，这里说明一下基本要点。

首先要明确的是，ZooKeeper集群是一个独立的分布式协调服务集群，“独立”的含义就是说，如果想使用ZooKeeper实现分布式应用的协调与管理，简化协调与管理，任何分布式应用都可以使用，这就要归功于Zookeeper的数据模型（Data Model）和层次命名空间（Hierarchical Namespace）结构，详细可以参考http://zookeeper.apache.org/doc/trunk/zookeeperOver.html。在设计你的分布式应用协调服务时，首要的就是考虑如何组织层次命名空间。

下面说明分布式模式的安装配置，过程如下所示

http://blog.csdn.net/shirdrn/article/details/7183503