ZooKeeper 安装

1. zookeeper 安装

• 1. zookeeper 安装
  • • 本文参考ZooKeeper Getting Started Guide编写。
    • 1. Windows下单机安装
    • 2. windows 集群安装（伪集群）
    • 3.zookeeper管理参考文档

本文参考ZooKeeper Getting Started Guide编写。

ZooKeeper概览

视本机具体情况选择下载，本次使用zookeeper-3.4.12.tar.gz

1. Windows下单机安装

1.1 ZooKeeper下载

• 解压到安装目录。
• 新建一个配置文件conf/zoo.cfg

dataDir=D:\\ProgramFiles\\zookeeper-3.4.12\\data
clientPort=2181

tickTime:指定了ZooKeeper的基本时间单位（以毫秒为单位）。
dataDir:存储内存数据快照位置。
clientPort：监听客户端连接端口。

• 启动ZooKeeper

$ bin\zkServer.cmd start

• 连接ZooKeeper

$  bin\zkCli.cmd -server 127.0.0.1:2181

• 简单命令
  
  • create znode

[zkshell: 9] create /zk_test my_data
Created /zk_test

• 查看目录

[zkshell: 11] ls /
[zookeeper, zk_test]

[zkshell: 9] create /zk_test my_data
Created /zk_test

• 查看 zk_test 这个znode对应的数据

[zkshell: 12] get /zk_test
my_data
cZxid = 5
ctime = Fri Jun 05 13:57:06 PDT 2009
mZxid = 5
mtime = Fri Jun 05 13:57:06 PDT 2009
pZxid = 5
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0
dataLength = 7
numChildren = 0

• 修改节点数据

[zkshell: 14] set /zk_test junk
cZxid = 5
ctime = Fri Jun 05 13:57:06 PDT 2009
mZxid = 6
mtime = Fri Jun 05 14:01:52 PDT 2009
pZxid = 5
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0
dataLength = 4
numChildren = 0

查看修改节点后的数据

[zkshell: 15] get /zk_test
junk
cZxid = 5
ctime = Fri Jun 05 13:57:06 PDT 2009
mZxid = 6
mtime = Fri Jun 05 14:01:52 PDT 2009
pZxid = 5
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0
dataLength = 4
numChildren = 0

• 删除节点

[zkshell: 16] delete /zk_test

查看节点是否还存在

[zkshell: 17] ls /
[zookeeper]

2. windows 集群安装（伪集群）

参考 http://blog.csdn.net/a906998248/article/details/50815031

官方建议集群模式是奇数台服务。至少三台。
http://zookeeper.apache.org/doc/current/zookeeperStarted.html
For replicated mode, a minimum of three servers are required, and it is strongly recommended that you have an odd number of servers. If you only have two servers, then you are in a situation where if one of them fails, there are not enough machines to form a majority quorum. Two servers is inherently less stable than a single server, because there are two single points of failure.

3.zookeeper管理参考文档