Zookeeper（二）客户端常用的命令

雨点打透心脏的1/2处 2022-10-27 02:31 159阅读 0赞

### 目录 ###

*  1. \`ls\`命令
 *  2. \`create\`命令
 *  3. \`get\`命令
 *  4. \`set\`命令
 *  5. \`delete\`命令

**我们通过bin目录下的`./zkCli.sh`，就可以进入到Zookeeper的命令行界面，在里面就可以使用一些Zookeeper的命令了：**

[root@localhost bin]# ls
    README.txt    zkCli.cmd  zkEnv.cmd  zkServer.cmd            zkServer.sh          zkTxnLogToolkit.sh
    zkCleanup.sh  zkCli.sh   zkEnv.sh   zkServer-initialize.sh  zkTxnLogToolkit.cmd
    [root@localhost bin]# ./zkCli.sh 
    Connecting to localhost:2181
    2021-02-02 19:55:17,158 [myid:] - INFO  [main:Environment@109] - Client environment:zookeeper.version=3.5.5-390fe37ea45dee01bf87dc1c042b5e3dcce88653, built on 05/03/2019 12:07 GMT
    2021-02-02 19:55:17,163 [myid:] - INFO  [main:Environment@109] - Client environment:host.name=localhost
    2021-02-02 19:55:17,163 [myid:] - INFO  [main:Environment@109] - Client environment:java.version=1.8.0_131
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.vendor=Oracle Corporation
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.home=/usr/local/java/jdk1.8.0_131/jre
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.class.path=/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/target/classes:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../build/classes:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/target/lib/*.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../build/lib/*.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/zookeeper-jute-3.5.5.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/zookeeper-3.5.5.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/slf4j-api-1.7.25.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/netty-all-4.1.29.Final.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/log4j-1.2.17.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/json-simple-1.1.1.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jline-2.11.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-util-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-servlet-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-server-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-security-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-io-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-http-9.4.17.v20190418.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/javax.servlet-api-3.1.0.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-databind-2.9.8.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-core-2.9.8.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-annotations-2.9.0.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/commons-cli-1.2.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../zookeeper-*.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/src/main/resources/lib/*.jar:/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin/../conf:.:/usr/local/java/jdk1.8.0_131/lib.tools.jar
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.io.tmpdir=/tmp
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:java.compiler=<NA>
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:os.name=Linux
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:os.arch=amd64
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:os.version=3.10.0-327.el7.x86_64
    2021-02-02 19:55:17,166 [myid:] - INFO  [main:Environment@109] - Client environment:user.name=root
    2021-02-02 19:55:17,167 [myid:] - INFO  [main:Environment@109] - Client environment:user.home=/root
    2021-02-02 19:55:17,167 [myid:] - INFO  [main:Environment@109] - Client environment:user.dir=/usr/local/zookeeper/apache-zookeeper-3.5.5-bin/bin
    2021-02-02 19:55:17,167 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.free=52MB
    2021-02-02 19:55:17,168 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.max=228MB
    2021-02-02 19:55:17,169 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.total=57MB
    2021-02-02 19:55:17,172 [myid:] - INFO  [main:ZooKeeper@868] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@759ebb3d
    2021-02-02 19:55:17,184 [myid:] - INFO  [main:X509Util@79] - Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
    2021-02-02 19:55:17,194 [myid:] - INFO  [main:ClientCnxnSocket@237] - jute.maxbuffer value is 4194304 Bytes
    2021-02-02 19:55:17,204 [myid:] - INFO  [main:ClientCnxn@1653] - zookeeper.request.timeout value is 0. feature enabled=
    Welcome to ZooKeeper!
    2021-02-02 19:55:17,212 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
    JLine support is enabled
    2021-02-02 19:55:17,289 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /127.0.0.1:32794, server: localhost/127.0.0.1:2181
    2021-02-02 19:55:17,315 [myid:localhost:2181] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1394] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x100019d10d70000, negotiated timeout = 30000
    
    WATCHER::
    
    WatchedEvent state:SyncConnected type:None path:null
    [zk: localhost:2181(CONNECTED) 0]

这里就可以输入一些命令了：  
![在这里插入图片描述][20210203115622807.png]

# 1. `ls`命令 #

**命令格式：**

ls [-s][-R] /path

**参数：**

*  `-s` 详细信息，替代老版的ls2
 *  `-R` 当前目录和子目录中内容都罗列出来

例如：`ls -R /` 显示根目录下所有内容

[zk: localhost:2181(CONNECTED) 2] ls -s /
    [zookeeper]cZxid = 0x0
    ctime = Wed Dec 31 16:00:00 PST 1969
    mZxid = 0x0
    mtime = Wed Dec 31 16:00:00 PST 1969
    pZxid = 0x0
    cversion = -1
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 0
    numChildren = 1
    
    [zk: localhost:2181(CONNECTED) 3] ls -R /
    /
    /zookeeper
    /zookeeper/config
    /zookeeper/quota

# 2. `create`命令 #

创建指定路径信息。

**命令格式：**

create /path [data]

**参数：**  
`[data]` ：包含内容

例如：`create /demo 创建/demo`

[zk: localhost:2181(CONNECTED) 4] create /demo
    Created /demo
    [zk: localhost:2181(CONNECTED) 5] ls /
    [demo, zookeeper]

# 3. `get`命令 #

查看指定路径下内容。

**命令格式：**

get [-s] /path

**参数：**  
\[`-s`\] ：详细信息

例如：`get -s /demo`

[zk: localhost:2181(CONNECTED) 14] ls /
    [demo, demo2, zookeeper]
    [zk: localhost:2181(CONNECTED) 15] get -s /demo
    null
    cZxid = 0x2
    ctime = Wed Feb 03 02:04:57 PST 2021
    mZxid = 0x2
    mtime = Wed Feb 03 02:04:57 PST 2021
    pZxid = 0x2
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 0
    numChildren = 0

**我们也同时看一下详细的信息里面都包括了什么内容：**

`null`:存放的数据  
`cZxid`:创建时zxid(znode每次改变时递增的事务id)  
`ctime`:创建时间戳  
`mZxid`:最近一次更新的zxid  
`mtime`:最近一次更新的时间戳  
`pZxid`:子节点的zxid  
`cversion`:子节点更新次数  
`dataversion`:节点数据更新次数  
`aclVersion`:节点ACL(授权信息)的更新次数  
`ephemeralOwner`:如果该节点为ephemeral节点(临时，生命周期与session一样), ephemeralOwner值表示与该节点绑定的session id. 如果该节点不是ephemeral节点, ephemeralOwner值为0.  
`dataLength`:节点数据字节数  
`numChildren`:子节点数量

# 4. `set`命令 #

设置节点内容。

**命令格式：**

set /path data

例如：

[zk: localhost:2181(CONNECTED) 17] ls /
    [demo, demo2, zookeeper]
    [zk: localhost:2181(CONNECTED) 18] set /demo liuweijia
    [zk: localhost:2181(CONNECTED) 19] get /demo
    liuweijia

# 5. `delete`命令 #

删除节点。

**命令格式：**

delete /path

例如：

[zk: localhost:2181(CONNECTED) 20] ls /
    [demo, demo2, zookeeper]
    [zk: localhost:2181(CONNECTED) 21] delete /demo2
    [zk: localhost:2181(CONNECTED) 22] delete /demo
    [zk: localhost:2181(CONNECTED) 23] ls /
    [zookeeper]

![在这里插入图片描述][20210204090838637.png]

[20210203115622807.png]: /images/20221024/b089d346876444a3857c99b7351beba9.png
[20210204090838637.png]: /images/20221024/6d9000d6e82743c7b66ecb8b29bdbb7a.png