ZooKeeper安装

一、单机模式安装

1、安装JDK

3、解压

4、将zoo_sample.cfg其名称修改为zoo.cfg

tickTime ：时长单位为毫秒，为zk使用的基本时间度量单位。例如，1 tickTime是客户端与zk服务端的心跳时间，2 tickTime是客户端会话的超时时间。 tickTime的默认值为2000毫秒，更低的tickTime值可以更快地发现超时问题，但也会导致更高的网络流量（心跳消息）和更高的CPU使用率（会话的跟踪处理）。

clientPort ：zk服务进程监听的TCP端口，默认情况下，服务端会监听2181端口。 dataDir ：无默认配置，必须配置，用于配置存储快照文件的目录。如果没有配置dataLogDir，那么事务日志也会存储在此目录。

5、启动

6、查看启动状态

二、集群模式安装

　　如：192.168.100.1

　　　　192.168.100.2

　　　　192.168.100.3

1、将zoo_sample.cfg其名称修改为zoo.cfg

2、修改zoo.cfg文件（3台机器配置文件同步）

# 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=/tmp/zookeeper
# the port at which the clients will connect
clientPort=2181
server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888
# 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