ZooKeeper命令行

ZooKeeper客户端有C语言和Java两个版本。

ZooKeeper的命令在/usr/lib/zookeeper/bin文件夹下。

运行Java版本的客户端使用bash zkCli.sh -server IP:port ，运行C语言版本的使用./cli_mt IP:port，下面介绍Java版本的，C语言版差不多。

查看具体结点信息

bash zkServer.sh status
root@ubuntu:/usr/lib/zookeeper/bin# bash zkServer.sh status
JMX enabled by default
Using config: /usr/lib/zookeeper/bin/../conf/zoo.cfg
Mode: standalone


查看哪个结点被选作leader或者follower
echo stat|nc 127.0.0.1 2181
root@ubuntu:/usr/lib/zookeeper/bin# echo stat|nc 127.0.0.1 2181 
Zookeeper version: 3.4.5-cdh4.4.0--1, built on 09/04/2013 01:46 GMT
Clients:
 /127.0.0.1:57736[0](queued=0,recved=1,sent=0)


Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: standalone
Node count: 4


测试是否启动了该Server，若回复imok表示已经启动
echo ruok|nc 127.0.0.1 2181
root@ubuntu:/usr/lib/zookeeper/bin# echo ruok|nc 127.0.0.1 2181
imok


ZooKeeper命令行类似于shell。
当启动 ZooKeeper 服务成功之后，输入下述命令，连接到 ZooKeeper 服务：
bash zkCli.sh –server 192.168.255.133:2181


root@ubuntu:/usr/lib/zookeeper/bin# bash zkCli.sh -server 192.168.255.133:2181
Connecting to 192.168.255.133:2181
2013-09-12 15:38:39,654 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.5-cdh4.4.0--1, built on 09/04/2013 01:46 GMT
2013-09-12 15:38:39,657 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=ubuntu
2013-09-12 15:38:39,659 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.6.0_43
2013-09-12 15:38:39,660 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Sun Microsystems Inc.
2013-09-12 15:38:39,662 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/local/jdk1.6.0_43/jre
2013-09-12 15:38:39,664 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/lib/zookeeper/bin/../build/classes:/usr/lib/zookeeper/bin/../build/lib/*.jar:/usr/lib/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/lib/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/lib/zookeeper/bin/../lib/netty-3.2.2.Final.jar:/usr/lib/zookeeper/bin/../lib/log4j-1.2.15.jar:/usr/lib/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/lib/zookeeper/bin/../zookeeper-3.4.5-cdh4.4.0.jar:/usr/lib/zookeeper/bin/../src/java/lib/*.jar:/usr/lib/zookeeper/bin/../conf:
2013-09-12 15:38:39,665 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/local/jdk1.6.0_43/jre/lib/amd64/server:/usr/local/jdk1.6.0_43/jre/lib/amd64:/usr/local/jdk1.6.0_43/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2013-09-12 15:38:39,667 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2013-09-12 15:38:39,668 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2013-09-12 15:38:39,669 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2013-09-12 15:38:39,670 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2013-09-12 15:38:39,670 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.2.0-51-generic
2013-09-12 15:38:39,672 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2013-09-12 15:38:39,672 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2013-09-12 15:38:39,673 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/usr/lib/zookeeper/bin
2013-09-12 15:38:39,674 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.255.133:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@2666e815
Welcome to ZooKeeper!
JLine support is enabled
2013-09-12 15:38:39,720 [myid:] - INFO  [main-SendThread(192.168.255.133:2181):ClientCnxn$SendThread@966] - Opening socket connection to server 192.168.255.133/192.168.255.133:2181. Will not attempt to authenticate using SASL (Unable to locate a login configuration)
2013-09-12 15:38:39,729 [myid:] - INFO  [main-SendThread(192.168.255.133:2181):ClientCnxn$SendThread@849] - Socket connection established to 192.168.255.133/192.168.255.133:2181, initiating session
[zk: 192.168.255.133:2181(CONNECTING) 0] 2013-09-12 15:38:39,748 [myid:] - INFO  [main-SendThread(192.168.255.133:2181):ClientCnxn$SendThread@1207] - Session establishment complete on server 192.168.255.133/192.168.255.133:2181, sessionid = 0x141102059a70001, negotiated timeout = 30000


WATCHER::


WatchedEvent state:SyncConnected type:None path:null


输入help显示帮助信息：

help 
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: 192.168.255.133:2181(CONNECTED) 1] 

连接成功后，系统会输出 ZooKeeper 的相关环境以及配置信息，并在屏幕输出“ Welcome to ZooKeeper ”等信息。

命令行工具的一些简单操作如下：

1 ）使用 ls 命令来查看当前 ZooKeeper 中所包含的内容：
[zk: 202.115.36.251:2181(CONNECTED) 1] ls /
[zookeeper]

2 ）创建一个新的 znode ，使用 create /zk myData 。这个命令创建了一个新的 znode 节点“ zk ”以及与它关联的字符串：
[zk: 202.115.36.251:2181(CONNECTED) 2] create /zk "myData"
Created /zk 

3 ）我们运行 get 命令来确认 znode 是否包含我们所创建的字符串：
[zk: 202.115.36.251:2181(CONNECTED) 3] get /zk
cZxid = 0x6
ctime = Thu Sep 12 15:49:16 CST 2013
mZxid = 0x7
mtime = Thu Sep 12 15:49:38 CST 2013
pZxid = 0x6
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 10
numChildren = 0

4 ）下面我们通过 set 命令来对 zk 所关联的字符串进行设置：
[zk: 202.115.36.251:2181(CONNECTED) 4] set /zk "zsl"
"myData"
cZxid = 0x4
ctime = Thu Sep 12 15:46:37 CST 2013
mZxid = 0x4
mtime = Thu Sep 12 15:46:37 CST 2013
pZxid = 0x4
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0

5 ）下面我们将刚才创建的 znode 删除：
[zk: 202.115.36.251:2181(CONNECTED) 5] delete /zk

当然，我们还可以创建有曾次的目录，比如使用create /zk/node1在zk目录下创建新的目录node1
[zk: 192.168.255.133:2181(CONNECTED) 18] create /zk/node1 "node1"
Created /zk/node1
[zk: 192.168.255.133:2181(CONNECTED) 19] ls /zk
[node1]


使用ZooKeeper四字命令

传递四个字母的字符串给ZooKeeper，ZooKeeper会返回一些有用的信息。

ZooKeeper 四字命令	功能描述
conf	输出相关服务配置的详细信息。
cons	列出所有连接到服务器的客户端的完全的连接 / 会话的详细信息。包括“接受 / 发送”的包数量、会话 id 、操作延迟、最后的操作执行等等信息。
dump	列出未经处理的会话和临时节点。
envi	输出关于服务环境的详细信息（区别于 conf 命令）。
reqs	列出未经处理的请求
ruok	测试服务是否处于正确状态。如果确实如此，那么服务返回“imok ”，否则不做任何相应。
stat	输出关于性能和连接的客户端的列表。
wchs	列出服务器 watch 的详细信息。
wchc	通过 session 列出服务器 watch 的详细信息，它的输出是一个与watch 相关的会话的列表。
wchp	通过路径列出服务器 watch 的详细信息。它输出一个与 session相关的路径。

例如：

root@ubuntu:/usr/lib/zookeeper/bin# echo conf |nc 192.168.255.133 2181    
clientPort=2181
dataDir=/var/lib/zookeeper/version-2
dataLogDir=/var/log/zookeeper/version-2
tickTime=2000
maxClientCnxns=50
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=0