zookeeper官方下载地址http://www.apache.org/dyn/closer.cgi/zookeeper/
zookeeper安装时建议使用单数。
我的集群/etc/hosts文件(zookeeper安装各节点配置)：
192.168.1.191 slave1
192.168.1.192 slave2
192.168.1.193 slave3
首先配置slave1：
1、将下载的zookeeper-3.4.5.tar.gz包解压，我的解压目录为/opt下
2、打开zookeeper-3.4.5/conf目录，复制zoo_sample.cfg文件，改名为zoo.cfg，然后对zoo.cfg进行修改。
我的zoo.cfg文件内容：
# 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=/home/zookeep/
# 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=slave1:2888:3888
server.2=slave2:2888:3888
server.3=slave3:2888:3888
3、在文件zoo.cfg中dataDir的配置目录下，新建一个myid文件，在文件中写入server.x对应的数字。每台服务器都需要配置。
1代表zoo.cfg文件中配置的server.1，也就是说myid文件中的内容x就是zoo.cfg文件中配置的server.x
如果不配置myid的话，在启动zookeeper时会报一个java.lang.IllegalArgumentException: /home/zookeep/myid file is missing的异常。
4、bin目录下执行zkServer.sh start就可以了。