常用命令之zookeeper命令

一、zookeeper客户端简介
  ZooKeeper提供了一个非常简单的命令行客户端zkCli，它在ZooKeeper安装目录的bin目录下。输入./zkCli.sh命令默认连接本地127.0.0.1:2181节点，如果我们需要连接远程节点可以使用./zkCli.sh -server ip:2181方式进行连接。连接过程中会输出一大堆信息。当连接成功后，将进入ZooKeeper的交互式模式。博文实验环境：

操作系统：centos7.6
zookeeper版本：3.6.3
二、zookeeper常用命令示例
0、连接zookeeper server
[wuhs@s143 bin]$ ./zkCli.sh -server 192.168.0.142:2181
Connecting to 192.168.0.142:2181
2022-03-02 22:26:26,705 [myid:] - INFO [main:Environment@98] - Client environment:zookeeper.version=
…
mplete on server s142/192.168.0.142:2181, session id = 0x100002542a90003, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
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2、查看软件版本
[zk: 192.168.0.142:2181(CONNECTED) 1] version
ZooKeeper CLI version: 3.6.3–6401e4ad2087061bc6b9f80dec2d69f2e3c8660a, built on 04/08/2021 16:35 GMT

3、连接一个远程节点
[zk: 192.168.0.142:2181(CONNECTED) 2] connect 192.168.0.143:2181

4、关闭连接
[zk: 192.168.0.143:2181(CONNECTED) 3] close

WATCHER::

WatchedEvent state:Closed type:None path:null
2022-03-03 01:29:57,127 [myid:] - INFO [main:ZooKeeper@1619] - Session: 0x20000253ae20003 closed
2022-03-03 01:29:57,127 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@578] - EventThread shut down for session: 0x20000253ae20003

5、显示仲裁成员的配置
[zk: 192.168.0.143:2181(CONNECTED) 8] config
server.1=192.168.0.142:2888:3888:participant
server.2=192.168.0.143:2888:3888:participant
server.3=192.168.0.144:2888:3888:participant
version=0

6、创建一个znode
  命令语法：create [-s] [-e] [-c] [-t ttl] path [data] [acl]

-s：创建的是带序列号的节点，序列号用0填充节点路径。
-e：创建的是临时节点。
-c：创建的是容器节点
path：znode的路径，ZooKeeper中没有相对路径，所有路径都必须以’/'开头。
data：znode携带的数据。
acl：这个节点的ACL。
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9、显示一个节点的状态
[zk: localhost:2181(CONNECTED) 25] stat /config/topics
cZxid = 0x100000024
ctime = Thu Mar 03 15:16:38 CST 2022
mZxid = 0x100000024
mtime = Thu Mar 03 15:16:38 CST 2022
pZxid = 0x100000031
cversion = 5
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 5

10、查看路径子节点
  命令语法：ls [-s] [-w] [-R] path

-s 同时显示stat信息
-w 只显示子节点信息，默认选项
-R 递归显示
[zk: localhost:2181(CONNECTED) 27] ls -R /
/
/config
/zk_test
/zookeeper
/config/topics
/config/topics/test
/config/topics/test2
/config/topics/test3
/config/topics/test4
/config/topics/test5
/zookeeper/config
/zookeeper/quota

11、获取指定路径下的数据
[zk: localhost:2181(CONNECTED) 4] get /zookeeper/config
server.1=192.168.0.142:2888:3888:participant
server.2=192.168.0.143:2888:3888:participant
server.3=192.168.0.144:2888:3888:participant
version=0

12、获取子节点数量
[zk: localhost:2181(CONNECTED) 10] getAllChildrenNumber /zookeeper
2

13、获取会话创建的临时节点
[zk: localhost:2181(CONNECTED) 14] create -e /config/abc
Created /config/abc
[zk: localhost:2181(CONNECTED) 15] getEphemerals /config
[/config/abc]

14、设置或者更新路径数据
[zk: 192.168.0.143:2181(CONNECTED) 45] set /config/topics/test “this is a test”
[zk: 192.168.0.143:2181(CONNECTED) 46] get /config/topics/test
this is a test
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16、获取ACL
[zk: localhost:2181(CONNECTED) 17] getAcl /config
'world,'anyone
: cdrwa

17、同步数据集群间数据
[zk: 192.168.0.143:2181(CONNECTED) 48] sync /
Sync is OK

18、查看命令执行历史
[zk: 192.168.0.143:2181(CONNECTED) 49] history
39 - create /config
40 - create /config/topics
41 - create /config/topics/test
42 - ls /
43 - help
44 - help
45 - set /config/topics/test “this is a test”
46 - get /config/topics/test
47 - set -v 2 /config/topics/test “this is a test 2”
48 - sync /
49 - history

19、退出客户端
[zk: 192.168.0.143:2181(CONNECTED) 50] quit

WATCHER::

WatchedEvent state:Closed type:None path:null
2022-03-03 03:58:33,818 [myid:] - INFO [main:ZooKeeper@1619] - Session: 0x20000253ae20004 closed
2022-03-03 03:58:33,818 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@578] - EventThread shut down for session: 0x20000253ae20004
2022-03-03 03:58:33,820 [myid:] - ERROR [main:ServiceUtils@42] - Exiting JVM with code 0

20、更多信息查看
  更多命令帮助信息我们可以查阅官网帮助文档，zookeeper 3.6.3版本命令帮助文件见链接：
https://zookeeper.apache.org/doc/r3.6.3/zookeeperCLI.html
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