Zookeeper：
1、可以作为集群的管理工具使用。
2、可以集中管理配置文件。
1.1.1. Zookeeper的安装
安装环境：
Linux：centos6.4
Jdk:1.7以上版本
Zookeeper是java开发的可以运行在windows、linux环境。需要先安装jdk。
安装步骤：
第一步：安装jdk
第二步：把zookeeper的压缩包上传到linux系统。
第三步：解压缩压缩包
tar -zxvf zookeeper-3.4.6.tar.gz第四步：进入zookeeper-3.4.6目录，创建data文件夹。
cd zookeeper-3.4.6/conf/第五步：把zoo_sample.cfg改名为zoo.cfg
[root@localhost conf]# mv zoo_sample.cfg zoo.cfg第六步：编辑zoo.cfg，修改data属性：
# 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
# 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/hao/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.
#
第七步：启动zookeeper
[root@localhost bin]# ./zkServer.sh start关闭：
[root@localhost bin]# ./zkServer.sh stop查看状态：
[root@localhost bin]# ./zkServer.sh status注意：需要关闭防火墙。
service iptables stop永久关闭修改配置开机不启动防火墙：
chkconfig iptables off如果不能成功启动zookeeper，需要删除data目录下的zookeeper_server.pid文件。