zookeeper client操作
原文地址“http://abloz.com/2012/09/04/zookeeper-client-operation.html”
独立的zookeeper 自带zkCli.sh，可以执行后查询zookeeper节点。
但在和HBase一起发布的zookeeper，没有带相应的独立shell文件。zookeeper配置也融合到hbase-site.xml中了。
如果想操作命令行shell，可以用hbase zkcli这样的命令。
命令行操作
[zhouhh@h185 bin]$ hbase zkcli -server h185:22228
Connecting to h185:22228
12/09/04 18:16:00 INFO zookeeper.ZooKeeper: Client environment:zookeeper.version=3.4.3-1240972, built on 02/06/2012 10:48 GMT
12/09/04 18:16:00 INFO zookeeper.ZooKeeper: Client environment:host.name=h185
12/09/04 18:16:00 INFO zookeeper.ZooKeeper: Client environment:java.version=1.7.0
12/09/04 18:16:00 INFO zookeeper.ZooKeeper: Client environment:java.vendor=Oracle Corporation
12/09/04 18:16:00 INFO zookeeper.ZooKeeper: Client environment:java.home=/usr/java/jdk1.7.0/jre
...
12/09/04 18:16:00 INFO zookeeper.ClientCnxn: Opening socket connection to server /192.168.10.185:22228
Welcome to ZooKeeper!
12/09/04 18:16:00 INFO client.ZooKeeperSaslClient: Client will not SASL-authenticate because the default JAAS configuration section 'Client' could not be found. If you are not using SASL, you may ignore this. On the other hand, if you expected SASL to work, please fix your JAAS configuration.
12/09/04 18:16:00 INFO zookeeper.ClientCnxn: Socket connection established to h185/192.168.10.185:22228, initiating session
JLine support is enabled
[zk: h185:22228(CONNECTING) 0] 12/09/04 18:16:00 INFO zookeeper.ClientCnxn: Session establishment complete on server h185/192.168.10.185:22228, sessionid = 0x398b2ce06a00b6, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: h185:22228(CONNECTED) 1] ls /
[hbase, zookeeper]
[zk: h185:22228(CONNECTED) 2] ls /hbase
[splitlog, unassigned, root-region-server, rs, backup-masters, draining, table, master, shutdown, hbaseid]
[zk: h185:22228(CONNECTED) 3] ls zookeeper
Command failed: java.lang.IllegalArgumentException: Path must start with / character
[zk: h185:22228(CONNECTED) 4] ls /zookeeper
[quota]
[zk: h185:22228(CONNECTED) 5] ls /zookeeper/quota
[]
[zk: h185:22228(CONNECTED) 6] ls /hbase/master
[]
[zk: h185:22228(CONNECTED) 7] ls /hbase/hbaseid
[]
[zk: h185:22228(CONNECTED) 9] get /hbase/hbaseid
� 7041@h185de3056fa-1bdd-4d01-bea2-22f141c7ff68
cZxid = 0x10000000b
ctime = Mon Aug 13 13:49:16 CST 2012
mZxid = 0xb00000008
mtime = Mon Sep 03 16:08:37 CST 2012
pZxid = 0x10000000b
cversion = 0
dataVersion = 12
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 50
numChildren = 0
[zk: h185:22228(CONNECTED) 16] a
ZooKeeper -server host:port cmd args
connect host:port
get path [watch]
ls path [watch]
set path data [version]
rmr path
delquota [-n|-b] path
quit
printwatches on|off
create [-s] [-e] path data acl
stat path [watch]
close
ls2 path [watch]
history
listquota path
setAcl path acl
getAcl path
sync path
redo cmdno
addauth scheme auth
delete path [version]
setquota -n|-b val path
[zk: h185:22228(CONNECTED) 20] ls /hbase/rs
[h183,61020,1346670998964, h181,61020,1346659787960, h184,61020,1346659711119, h182,61020,1346659775558]
[zk: h185:22228(CONNECTED) 26] ls /hbase/table
[toplist_user_index_a_ios_total_2012-08-14_24,...]
具体用法，在《HBase官方文档》12.4工具一节有说明。一些老的文档，直接在hbase的shell里面执行zk命令，已经过时了。
22228端口，是hbase-site.xml中hbase.zookeeper.property.clientPort配置的，缺省2181端口。
创建和删除一个znode
[zk: h185:22228(CONNECTED) 49] create /zk mydata Created /zk [zk: h185:22228(CONNECTED) 50] ls /zk [] [zk: h185:22228(CONNECTED) 51] get /zk mydata cZxid = 0xb00c13cd2 ctime = Tue Sep 04 18:43:27 CST 2012 mZxid = 0xb00c13cd2 mtime = Tue Sep 04 18:43:27 CST 2012 pZxid = 0xb00c13cd2 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 6 numChildren = 0 [zk: h185:22228(CONNECTED) 52] ls2 /zk [] cZxid = 0xb00c13cd2 ctime = Tue Sep 04 18:43:27 CST 2012 mZxid = 0xb00c13cd2 mtime = Tue Sep 04 18:43:27 CST 2012 pZxid = 0xb00c13cd2 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 6 numChildren = 0 [zk: h185:22228(CONNECTED) 53] rmr /zk [zk: h185:22228(CONNECTED) 54] ls / [hbase, zookeeper]
另外，可以通过nc或telnet命令发送到客户端。
[zhouhh@h184 zk]$ echo stat | nc h185 22228 Zookeeper version: 3.4.3-1240972, built on 02/06/2012 10:48 GMT Clients: /192.168.10.184:58120[1](queued=0,recved=9300594,sent=9300604) /192.168.10.185:45027[1](queued=2,recved=30329742,sent=39627384) /192.168.10.184:35598[0](queued=0,recved=1,sent=0) /192.168.10.185:45031[1](queued=0,recved=1734,sent=1736) /192.168.10.185:50430[1](queued=0,recved=154,sent=154) /192.168.10.181:43237[1](queued=0,recved=1429799,sent=1429811) /192.168.10.182:57454[1](queued=4,recved=13751816,sent=13751824) /192.168.10.183:39127[1](queued=0,recved=68432,sent=68432) Latency min/avg/max: 0/13/1289 Received: 54884167 Sent: 64181843 Outstanding: 7 Zxid: 0xb00c0a138 Mode: follower Node count: 2140 [zhouhh@h184 zk]$ echo stat | nc h184 22228 Zookeeper version: 3.4.3-1240972, built on 02/06/2012 10:48 GMT Clients: /192.168.10.184:36874[1](queued=0,recved=1599,sent=1599) /192.168.10.184:42575[0](queued=0,recved=1,sent=0) Latency min/avg/max: 0/18/318 Received: 3083 Sent: 3082 Outstanding: 0 Zxid: 0xb00c0ac92 Mode: leader Node count: 2140 [zhouhh@h184 zk]$ echo ruok | nc h184 22228 imok
ruok意思是are you ok？
另外还有envi查看环境，srst重置服务统计信息，从运行zookeeper的服务器发送kill命令关闭zookeeper服务。
可以配置zookeeper JMX支持，了解更多的四字母命令。
参考：
http://abloz.com/hbase/book.html#trouble.tools
http://zookeeper.apache.org/