Zookeeper命令行操作(常用命令；客户端连接；查看znode路径；创建节点；获取znode数据，查看节点内容，设置节点内容，删除节点；监听znode事件；telnet连接zookeeper)

8.1.常用命令

启动ZK服务	bin/zkServer.sh start
查看ZK服务状态	bin/zkServer.sh status
停止ZK服务	bin/zkServer.sh stop
重启ZK服务	bin/zkServer.sh restart
连接服务器	zkCli.sh -server 127.0.0.1:2181

8.2 客户端连接

运行 zkCli.sh –server <ip>进入命令行工具

在192.168.106.82服务器上连接到192.168.106.81服务器下的zk

[root@hadoop3bin]# zkCli.sh -server 192.168.106.81:2181

8.3 查看znode路径

查看根目录：

[zk: 192.168.106.81:2181(CONNECTED) 0] ls /

[zookeeper, mygirls]

查看其它节点中的内容

[zk: 192.168.106.81:2181(CONNECTED) 1] ls /mygirls

[liuyifei, angelababy]

[zk: 192.168.106.81:2181(CONNECTED) 2] ls /zookeeper

[quota]

8.5.创建节点

创建testnode节点，关联字符串”zz”

[zk: 192.168.106.81:2181(CONNECTED) 3] create /zookeeper/testnode "zzzzzzz"

Created /zookeeper/testnode

8.6 获取znode数据，查看节点内容，设置节点内容，删除节点

[zk: 192.168.106.81:2181(CONNECTED) 4] get /mygirls

lsadasdasd

cZxid = 0x800000002

ctime = Wed Jan 04 23:26:09 CST 2017

mZxid = 0x80000000c

mtime = Wed Jan 04 23:38:06 CST 2017

pZxid = 0x800000004

cversion = 2

dataVersion = 6

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 10

numChildren = 2

[zk: 192.168.106.81:2181(CONNECTED) 5]

设置节点内容

[zk: 192.168.106.81:2181(CONNECTED) 6] ls /mygirls

[liuyifei, angelababy]

[zk: 192.168.106.81:2181(CONNECTED) 7] set /mygirls/liuyifei aaaaaaa

cZxid = 0x800000003

ctime = Wed Jan 04 23:27:56 CST 2017

mZxid = 0x800000010

mtime = Thu Jan 05 00:50:37 CST 2017

pZxid = 0x800000003

cversion = 0

dataVersion = 1

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 7

numChildren = 0

[zk: 192.168.106.81:2181(CONNECTED) 8] get /mygirls/liuyifei

aaaaaaa

cZxid = 0x800000003

ctime = Wed Jan 04 23:27:56 CST 2017

mZxid = 0x800000010

mtime = Thu Jan 05 00:50:37 CST 2017

pZxid = 0x800000003

cversion = 0

dataVersion = 1

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 7

numChildren = 0

[zk: 192.168.106.81:2181(CONNECTED) 9]

删除节点

[zk: 192.168.106.81:2181(CONNECTED) 15] ls /zookeeper

[testnode, quota]

[zk: 192.168.106.81:2181(CONNECTED) 16] delete /zookeeper/testnode

[zk: 192.168.106.81:2181(CONNECTED) 17] ls /zookeeper

[quota]

[zk: 192.168.106.81:2181(CONNECTED) 18]

退出客户端的命令：quit

[zk: 192.168.106.81:2181(CONNECTED) 18] quit

Quitting...

2017-01-05 00:58:21,076 [myid:] - INFO  [main:ZooKeeper@684] - Session: 0x25969e0732e0001 closed

2017-01-05 00:58:21,076 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@509] - EventThread shut down

[root@hadoop3 bin]#

8.7 监听znode事件

ls /mygirls watch     ## 就对一个节点的子节点变化事件注册了监听

当在82服务器上写ls /mygirls  watch的时候，在81上创建一个znode,发现80上的上图出现提醒。

get /mygirls watch     ## 就对一个节点的数据内容变化事件注册了监听

开始的时候在80上执行get /mygirls watch，接着在81上执行set /mygirls bbbbbb，执行完成之后，发现在80上的右上角有消息提醒。

注意：监听器只生效一次

监听器的工作机制，其实是在客户端会专门创建一个监听线程，在本机的一个端口上等待zk集群发送过来事件

8.8.telnet连接zookeeper

telnet 192.168.106.82 2181

成功之后，输入conf，会出现一下内容：

clientPort=2181

dataDir=/home/tuzq/software/zookeeper/zkdata/version-2

dataLogDir=/home/tuzq/software/zookeeper/log/version-2

tickTime=2000

maxClientCnxns=60

minSessionTimeout=4000

maxSessionTimeout=40000

serverId=3

initLimit=10

syncLimit=5

electionAlg=3

electionPort=3888

quorumPort=2888

peerType=0