zookeeper的安装

1.从官网下载zookeeper-3.4.5.tar.gz 与hadoop 1.2.1对应
2.设置两台服务器zookeeper1 zookeeper2，修改/etc/hosts，解压到这两人台机器的/home/hadoop/zookeeper-3.4.5
3.把conf/zoo_sample.cfg拷贝成conf/zoo.cfg
修改如下：
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/zookeeper/data
dataLogDir=/home/hadoop/zookeeper/log
clientPort=2181
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888

在zookeeper/目录下建data log两个目录
然后,在zookeeper1和zookeeper2两台机器的data目录下创建myid，分别写入1和2

4.cd bin/

bash zkServer.sh start
在zookeeper1和zookeeper2分别执行以上命令
5.zkServer.sh status
zookeeper1会返回Mode:leader
zookeeper2会返回Mode:follower
6.zkCli.sh -server zookeeper1:2818

启动客户端命令行
bash zkCli.sh