Zookeeper系列一：Zookeeper基础命令操作

爱被打了一巴掌 2023-01-17 12:51 182阅读 0赞

https://blog.csdn.net/dandandeshangni/article/details/80558383

## 前言 ##

由于公司年底要更换办公地点，所以最近投了一下简历，发现面试官现在很喜欢问`dubbo`、`zookeeper`和高并发等。由于公司没有使用`dubbo`，只知道`dubbo`是一个远程服务调用的分布式框架，`zookeeper`为分布式应用程序协调服务。因此，本周查阅资料整理下`zookeeper`学习笔记。

### 安装zookeeper ###

安装参考链接[https://blog.csdn.net/qiunian144084/article/details/79192819][https_blog.csdn.net_qiunian144084_article_details_79192819]

### 基础命令操作 ###

#### 启动zk服务 ####

*  `./zkServer.sh start`

[root@localhost bin]# ./zkServer.sh
    ZooKeeper JMX enabled by default
    Using config: /usr/home/zookeeper-3.4.11/bin/../conf/zoo.cfg
    Usage: ./zkServer.sh {start|start-foreground|stop|restart|status|upgrade|print-cmd}
    # 提示要以./zkCli.sh start 启动zk
    ./zkCli.sh start 
     
      
     
      
       查看zk的运行状态 ./zkServer.sh status 由于我已经配置了zk的集群，所以此处显示状态为leader [root@localhost bin]# ./zkServer.sh status
    ZooKeeper JMX enabled by default
    Using config: /usr/home/zookeeper-3.4.11/bin/../conf/zoo.cfg
    Mode: leader
       
         
       
         客户端链接zk [root@localhost bin]# ./zkCli.sh 
    ......
    WatchedEvent state:SyncConnected type:None path:null
    [zk: localhost:2181(CONNECTED) 0]
       
         
       
         
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         help 查看客户端帮助命令 help [zk: localhost:2181(CONNECTED) 0] help
    ZooKeeper -server host:port cmd args
        stat path [watch]
        set path data [version] ls path [watch] delquota [-n|-b] path ls2 path [watch] setAcl path acl setquota -n|-b val path history redo cmdno printwatches on|off delete path [version] sync path listquota path rmr path get path [watch] create [-s] [-e] path data acl addauth scheme auth quit getAcl path close connect host:port [zk: localhost:2181(CONNECTED) 1] 
       
         
       
         
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         ls 查看 ls 查看命令(niocoder是我测试集群创建的节点，默认只有zookeeper一个节点) [zk: localhost:2181(CONNECTED) 1] ls /
    [niocoder, zookeeper]
    [zk: localhost:2181(CONNECTED) 2] ls /zookeeper 
    [quota]
    [zk: localhost:2181(CONNECTED) 4] ls /zookeeper/quota
    []
       
         
       
         
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         get 获取节点数据和更新信息 get内容为空 cZxid ：创建节点的id ctime ： 节点的创建时间 mZxid ：修改节点的id mtime ：修改节点的时间 pZxid ：子节点的id cversion : 子节点的版本 dataVersion ： 当前节点数据的版本 aclVersion ：权限的版本 ephemeralOwner ：判断是否是临时节点 dataLength ： 数据的长度 numChildren ：子节点的数量 [zk: localhost:2181(CONNECTED) 7] get /zookeeper #下面空行说明节点内容为空

cZxid = 0x0  
ctime = Thu Jan 01 00:00:00 UTC 1970  
mZxid = 0x0  
mtime = Thu Jan 01 00:00:00 UTC 1970  
pZxid = 0x0  
cversion = -1  
dataVersion = 0  
aclVersion = 0  
ephemeralOwner = 0x0  
dataLength = 0  
numChildren = 1  
\[zk: localhost:2181(CONNECTED) 8\]

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#### stat 获得节点的更新信息 ####

*  `stat`

[zk: localhost:2181(CONNECTED) 8] stat /zookeeper
    cZxid = 0x0
    ctime = Thu Jan 01 00:00:00 UTC 1970
    mZxid = 0x0
    mtime = Thu Jan 01 00:00:00 UTC 1970
    pZxid = 0x0
    cversion = -1
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 0
    numChildren = 1
     
      
     
      
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#### ls2 ls命令和stat命令的整合 ####

*  `ls2`

[zk: localhost:2181(CONNECTED) 10] ls2 /zookeeper
    [quota]
    cZxid = 0x0
    ctime = Thu Jan 01 00:00:00 UTC 1970
    mZxid = 0x0
    mtime = Thu Jan 01 00:00:00 UTC 1970
    pZxid = 0x0
    cversion = -1
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 0
    numChildren = 1
    [zk: localhost:2181(CONNECTED) 11] 
     
      
     
      
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#### create 创建节点 ####

*  `create [-s] [-e] path data acl` 可以注意一下各个版本的变化

#创建merryyou节点，节点的内容为merryyou
    [zk: localhost:2181(CONNECTED) 1] create /merryyou merryyou
    Created /merryyou
    #获得merryyou节点内容
    [zk: localhost:2181(CONNECTED) 3] get /merryyou
    merryyou
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x200000004
    mtime = Sat Jun 02 14:20:06 UTC 2018
    pZxid = 0x200000004
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 8
    numChildren = 0
     
      
     
      
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#### create -e 创建临时节点 ####

*  `create -e`

#创建临时节点
    [zk: localhost:2181(CONNECTED) 4] create -e  /merryyou/temp merryyou
    Created /merryyou/temp
    [zk: localhost:2181(CONNECTED) 5] get /merryyou
    merryyou
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x200000004
    mtime = Sat Jun 02 14:20:06 UTC 2018
    pZxid = 0x200000005
    cversion = 1
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 8
    numChildren = 1
    [zk: localhost:2181(CONNECTED) 6] get /merryyou/temp
    merryyou
    cZxid = 0x200000005
    ctime = Sat Jun 02 14:22:24 UTC 2018
    mZxid = 0x200000005
    mtime = Sat Jun 02 14:22:24 UTC 2018
    pZxid = 0x200000005
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x2000000d4500000
    dataLength = 8
    numChildren = 0
    [zk: localhost:2181(CONNECTED) 7] 
    #断开重连之后，临时节点自动消失
    WATCHER::

WatchedEvent state:SyncConnected type:None path:null  
\#因为默认的心跳机制，此时查询临时节点还存在  
\[zk: localhost:2181(CONNECTED) 0\] ls /merryyou  
\[temp\]  
\#再次查询，临时节点消失  
\[zk: localhost:2181(CONNECTED) 1\] ls /merryyou  
\[\]  
\[zk: localhost:2181(CONNECTED) 2\]

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#### create -s 创建顺序节点 自动累加 ####

*  `create -s`

# 创建顺序节点，顺序节点会自动累加
    [zk: localhost:2181(CONNECTED) 2] create -s /merryyou/sec seq
    Created /merryyou/sec0000000001
    [zk: localhost:2181(CONNECTED) 3] create -s /merryyou/sec seq
    Created /merryyou/sec0000000002 
     
      
     
      
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#### set path data \[version\] 修改节点 ####

[zk: localhost:2181(CONNECTED) 6] get /merryyou
    merryyou
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x200000004
    mtime = Sat Jun 02 14:20:06 UTC 2018
    pZxid = 0x200000009
    cversion = 4
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 8
    numChildren = 2
    # 修改节点内容为new-merryyou
    [zk: localhost:2181(CONNECTED) 7] set /merryyou new-merryyou
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x20000000a
    mtime = Sat Jun 02 14:29:23 UTC 2018
    pZxid = 0x200000009
    cversion = 4
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 12
    numChildren = 2
    #再次查询，节点内容已经修改
    [zk: localhost:2181(CONNECTED) 8] get /merryyou
    new-merryyou
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x20000000a
    mtime = Sat Jun 02 14:29:23 UTC 2018
    pZxid = 0x200000009
    cversion = 4
    dataVersion = 1
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 12
    numChildren = 2
    #set 根据版本号更新 dataVersion 乐观锁
    [zk: localhost:2181(CONNECTED) 9] set /merryyou test-merryyou 1
    cZxid = 0x200000004
    ctime = Sat Jun 02 14:20:06 UTC 2018
    mZxid = 0x20000000b
    mtime = Sat Jun 02 14:31:30 UTC 2018
    pZxid = 0x200000009
    cversion = 4
    dataVersion = 2
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 13
    numChildren = 2
    #因为数据的版本号已经修改为2 再次使用版本号1修改节点提交错误
    [zk: localhost:2181(CONNECTED) 10] set /merryyou test-merryyou 1
    version No is not valid : /merryyou
     
      
     
      
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#### delete path \[version\] 删除节点 ####

[zk: localhost:2181(CONNECTED) 13] delete /merryyou/sec000000000

sec0000000001 sec0000000002  
\[zk: localhost:2181(CONNECTED) 13\] delete /merryyou/sec0000000001  
\[zk: localhost:2181(CONNECTED) 14\] ls /merryyou  
\[sec0000000002\]  
\[zk: localhost:2181(CONNECTED) 15\]  
\#版本号操作与set类似 version

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#### watcher通知机制 ####

关于`watcher`机制大体的理解可以为，当每个节点发生变化，都会触发`watcher`事件，类似于`mysql`的触发器。`zk`中 `watcher`是一次性的，触发后立即销毁。可以参考[https://blog.csdn.net/hohoo1990/article/details/78617336][https_blog.csdn.net_hohoo1990_article_details_78617336]  
\- `stat path [watch]` 设置watch事件  
\- `get path [watch]`设置watch事件  
\- 子节点创建和删除时触发watch事件，子节点修改不会触发该事件

##### stat path \[watch\] 设置watch事件 #####

#添加watch 事件
    [zk: localhost:2181(CONNECTED) 18] stat /longfei watch
    Node does not exist: /longfei
    #创建longfei节点时触发watcher事件
    [zk: localhost:2181(CONNECTED) 19] create /longfei test

WATCHER::

WatchedEvent state:SyncConnected type:NodeCreated path:/longfei  
Created /longfei

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##### get path \[watch\] 设置watch事件 #####

#使用get命令添加watch事件
    [zk: localhost:2181(CONNECTED) 20] get /longfei watch
    test
    cZxid = 0x20000000e
    ctime = Sat Jun 02 14:43:15 UTC 2018
    mZxid = 0x20000000e
    mtime = Sat Jun 02 14:43:15 UTC 2018
    pZxid = 0x20000000e
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 0
    #修改节点触发watcher事件
    [zk: localhost:2181(CONNECTED) 21] set /longfei new_test

WATCHER::

WatchedEvent state:SyncConnected type:NodeDataChanged path:/longfei  
cZxid = 0x20000000e  
ctime = Sat Jun 02 14:43:15 UTC 2018  
mZxid = 0x20000000f  
mtime = Sat Jun 02 14:45:06 UTC 2018  
pZxid = 0x20000000e  
cversion = 0  
dataVersion = 1  
aclVersion = 0  
ephemeralOwner = 0x0  
dataLength = 8  
numChildren = 0  
\[zk: localhost:2181(CONNECTED) 22\]  
\#删除触发watcher事件  
\[zk: localhost:2181(CONNECTED) 23\] get /longfei watch  
new\_test  
cZxid = 0x20000000e  
ctime = Sat Jun 02 14:43:15 UTC 2018  
mZxid = 0x20000000f  
mtime = Sat Jun 02 14:45:06 UTC 2018  
pZxid = 0x20000000e  
cversion = 0  
dataVersion = 1  
aclVersion = 0  
ephemeralOwner = 0x0  
dataLength = 8  
numChildren = 0  
\[zk: localhost:2181(CONNECTED) 24\] delete /longfei

WATCHER::

WatchedEvent state:SyncConnected type:NodeDeleted path:/longfei  
\[zk: localhost:2181(CONNECTED) 25\]

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#### ACL权限控制 ####

ZK的节点有5种操作权限：`CREATE`、`READ`、`WRITE`、`DELETE`、`ADMIN` 也就是 增、删、改、查、管理权限，这5种权限简写为`crwda`(即：每个单词的首字符缩写)。  
注：这5种权限中，delete是指对子节点的删除权限，其它4种权限指对自身节点的操作权限

身份的认证有4种方式：  
\- `world`：默认方式，相当于全世界都能访问  
\- `auth`：代表已经认证通过的用户(cli中可以通过addauth digest user:pwd 来添加当前上下文中的授权用户)  
\- `digest`：即用户名:密码这种方式认证，这也是业务系统中最常用的  
\- `ip`：使用Ip地址认证

使用`[scheme:id:permissions]`来表示acl权限

##### getAcl:获取某个节点的acl权限信息 #####

#获取节点权限信息默认为 world:cdrwa任何人都可以访问
    [zk: localhost:2181(CONNECTED) 34] getAcl /merryyou
    'world,'anyone
    : cdrwa
    [zk: localhost:2181(CONNECTED) 35] 
     
      
     
      
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##### setAcl 设置权限 #####

[zk: localhost:2181(CONNECTED) 35] create /merryyou/test test
    Created /merryyou/test
    [zk: localhost:2181(CONNECTED) 36] getAcl /merryyou/test
    'world,'anyone
    : cdrwa
    #设置节点权限 crwa 不允许删除
    [zk: localhost:2181(CONNECTED) 37] setAcl /merryyou/test world:anyone:crwa
    cZxid = 0x200000018
    ctime = Sat Jun 02 16:18:18 UTC 2018
    mZxid = 0x200000018
    mtime = Sat Jun 02 16:18:18 UTC 2018
    pZxid = 0x200000018
    cversion = 0
    dataVersion = 0
    aclVersion = 1
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 0
    #查询刚才设置的acl权限信息 crwa 没有删除权限
    [zk: localhost:2181(CONNECTED) 38] getAcl /merryyou/test
    'world,'anyone
    : crwa
    [zk: localhost:2181(CONNECTED) 39] 
    [zk: localhost:2181(CONNECTED) 39] create /merryyou/test/abc abc
    Created /merryyou/test/abc
    #删除子节点的时候提交权限不足
    [zk: localhost:2181(CONNECTED) 40] delete /merryyou/test/abc
    Authentication is not valid : /merryyou/test/abc
    #设置节点的权限信息为rda
    [zk: localhost:2181(CONNECTED) 41] setAcl /merryyou/test world:anyone:rda 
    cZxid = 0x200000018
    ctime = Sat Jun 02 16:18:18 UTC 2018
    mZxid = 0x200000018
    mtime = Sat Jun 02 16:18:18 UTC 2018
    pZxid = 0x20000001a
    cversion = 1
    dataVersion = 0
    aclVersion = 2
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 1
    [zk: localhost:2181(CONNECTED) 42] getAcl /merryyou/test
    'world,'anyone
    : dra
    #可以成功删除
    [zk: localhost:2181(CONNECTED) 43] delete /merryyou/test/abc             
    [zk: localhost:2181(CONNECTED) 46] ls /merryyou/test
    []
    [zk: localhost:2181(CONNECTED) 47] 
    #设置节点信息为a admin
    [zk: localhost:2181(CONNECTED) 47] setAcl /merryyou/test world:anyone:a  
    cZxid = 0x200000018
    ctime = Sat Jun 02 16:18:18 UTC 2018
    mZxid = 0x200000018
    mtime = Sat Jun 02 16:18:18 UTC 2018
    pZxid = 0x20000001d
    cversion = 2
    dataVersion = 0
    aclVersion = 3
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 0
    #获取 设置都提示权限不足
    [zk: localhost:2181(CONNECTED) 49] get /merryyou/test
    Authentication is not valid : /merryyou/test
    [zk: localhost:2181(CONNECTED) 50] set /merryyou/test 123
    Authentication is not valid : /merryyou/test
    [zk: localhost:2181(CONNECTED) 51] 
     
      
     
      
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##### acl Auth 密码明文设置 #####

[zk: localhost:2181(CONNECTED) 53] create /niocoder/merryyou merryyou
    Created /niocoder/merryyou
    #查询默认节点权限信息
    [zk: localhost:2181(CONNECTED) 54] getAcl /niocoder/merryyou
    'world,'anyone
    : cdrwa
    [zk: localhost:2181(CONNECTED) 55] 
    #使用auth设置节点权限信息
    [zk: localhost:2181(CONNECTED) 2] setAcl /niocoder/merryyou auth:test:test:cdrwa  
    Acl is not valid : /niocoder/merryyou
    # 注册test:test 账号密码
    [zk: localhost:2181(CONNECTED) 3] addauth digest test:test
    [zk: localhost:2181(CONNECTED) 4] setAcl /niocoder/merryyou auth:test:test:cdrwa
    cZxid = 0x200000020
    ctime = Sat Jun 02 16:32:08 UTC 2018
    mZxid = 0x200000020
    mtime = Sat Jun 02 16:32:08 UTC 2018
    pZxid = 0x200000020
    cversion = 0
    dataVersion = 0
    aclVersion = 1
    ephemeralOwner = 0x0
    dataLength = 8
    numChildren = 0
    #查询节点权限信息 密码为密文格式
    [zk: localhost:2181(CONNECTED) 5] getAcl /niocoder/merryyou
    'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
    : cdrwa
    [zk: localhost:2181(CONNECTED) 6] 
     
      
     
      
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##### acl digest 密码密文设置 #####

[zk: localhost:2181(CONNECTED) 13] create /names test
    Created /names
    [zk: localhost:2181(CONNECTED) 14] getAcl /names
    'world,'anyone
    : cdrwa
    #使用digest设置节点的权限信息 密码为test密文
    [zk: localhost:2181(CONNECTED) 15] setAcl /names digest:test:V28q/NynI4JI3Rk54h0r8O5kMug=:cdra
    cZxid = 0x400000006
    ctime = Sun Jun 03 01:01:17 UTC 2018
    mZxid = 0x400000006
    mtime = Sun Jun 03 01:01:17 UTC 2018
    pZxid = 0x400000006
    cversion = 0
    dataVersion = 0
    aclVersion = 1
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 0
    #查询节点权限信息
    [zk: localhost:2181(CONNECTED) 16] getAcl /names
    'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
    : cdra
    #获取节点信息提示权限不足
    [zk: localhost:2181(CONNECTED) 5] get /names
    Authentication is not valid : /names
    # 注册账户
    [zk: localhost:2181(CONNECTED) 4] addauth digest test:test
    # 可以正常获取
    [zk: localhost:2181(CONNECTED) 17] get /names          
    test
    cZxid = 0x400000006
    ctime = Sun Jun 03 01:01:17 UTC 2018
    mZxid = 0x400000006
    mtime = Sun Jun 03 01:01:17 UTC 2018
    pZxid = 0x400000006
    cversion = 0
    dataVersion = 0
    aclVersion = 1
    ephemeralOwner = 0x0
    dataLength = 4
    numChildren = 0
    #由于没有设置写权限不能修改节点 w
    [zk: localhost:2181(CONNECTED) 18] set /names 111
    Authentication is not valid : /names
    [zk: localhost:2181(CONNECTED) 19] delete /names
    [zk: localhost:2181(CONNECTED) 20] 
     
      
     
      
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##### acl ip 控制客户端 #####

[zk: localhost:2181(CONNECTED) 22] create /niocoder/ip aa
    Created /niocoder/ip
    [zk: localhost:2181(CONNECTED) 23] get /niocoder/ip
    aa
    cZxid = 0x40000000a
    ctime = Sun Jun 03 01:06:47 UTC 2018
    mZxid = 0x40000000a
    mtime = Sun Jun 03 01:06:47 UTC 2018
    pZxid = 0x40000000a
    cversion = 0
    dataVersion = 0
    aclVersion = 0
    ephemeralOwner = 0x0
    dataLength = 2
    numChildren = 0
    # 添加ip控制的权限信息
    [zk: localhost:2181(CONNECTED) 24] setAcl /niocoder/ip ip:192.168.0.68:cdrwa
    cZxid = 0x40000000a
    ctime = Sun Jun 03 01:06:47 UTC 2018
    mZxid = 0x40000000a
    mtime = Sun Jun 03 01:06:47 UTC 2018
    pZxid = 0x40000000a
    cversion = 0
    dataVersion = 0
    aclVersion = 1
    ephemeralOwner = 0x0
    dataLength = 2
    numChildren = 0
    [zk: localhost:2181(CONNECTED) 25] getAcl /niocoder/ip
    'ip,'192.168.0.68
    : cdrwa
    [zk: localhost:2181(CONNECTED) 26] 
     
      
     
      
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##### acl super超级管理员 #####

使用`super`权限需要修改`zkServer.sh`，添加`super`管理员，重启`zkServer.sh`

"-Dzookeeper.DigestAuthenticationProvider.superDigest=test:V28q/NynI4JI3Rk54h0r8O5kMug="
     nohup "$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.DigestAuthenticationprovider.superDigest=test:V28q/NynI4JI3Rk54h0r8O5kMug=" \
        -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null &

\#重启进入zkCli  
\#由于之前设置ip权限，所以不允许访问  
\[zk: localhost:2181(CONNECTED) 2\] ls /niocoder/ip  
Authentication is not valid : /niocoder/ip  
\#登录账号信息，即为管理员账号  
\[zk: localhost:2181(CONNECTED) 3\] addauth digest test:test  
\#正常访问，节点内容为空  
\[zk: localhost:2181(CONNECTED) 4\] ls /niocoder/ip  
\[\]  
\[zk: localhost:2181(CONNECTED) 5\] get /niocoder/ip  
aa  
cZxid = 0x40000000a  
ctime = Sun Jun 03 01:06:47 UTC 2018  
mZxid = 0x40000000a  
mtime = Sun Jun 03 01:06:47 UTC 2018  
pZxid = 0x40000000a  
cversion = 0  
dataVersion = 0  
aclVersion = 1  
ephemeralOwner = 0x0  
dataLength = 2  
numChildren = 0  
\[zk: localhost:2181(CONNECTED) 6\]

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#### 四字命令Four Letter Words ####

*  使用四字命令需要安装`nc`命令,(`yum install nc`)

##### stat 查看状态信息 #####

[root@localhost bin]# echo stat | nc 192.168.0.68 2181
    Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
    Clients:
     /192.168.0.68:49346[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/4  
Received: 62  
Sent: 61  
Connections: 1  
Outstanding: 0  
Zxid: 0x50000000a  
Mode: follower  
Node count: 10  
\[root@localhost bin\]\#

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##### ruok 查看zookeeper是否启动 #####

[root@localhost bin]# echo ruok | nc 192.168.0.68 2181
    imok[root@localhost bin]# 
     
      
     
      
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##### dump 列出没有处理的节点，临时节点 #####

imok[root@localhost bin]# echo dump | nc 192.168.0.68 2181
    SessionTracker dump:
    org.apache.zookeeper.server.quorum.LearnerSessionTracker@29805957
    ephemeral nodes dump:
    Sessions with Ephemerals (0):
    [root@localhost bin]# 
     
      
     
      
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##### conf 查看服务器配置 #####

[root@localhost bin]# echo conf | nc 192.168.0.68 2181
    clientPort=2181
    dataDir=/usr/home/zookeeper-3.4.11/data/version-2
    dataLogDir=/usr/home/zookeeper-3.4.11/data/version-2
    tickTime=2000
    maxClientCnxns=60
    minSessionTimeout=4000
    maxSessionTimeout=40000
    serverId=2
    initLimit=10
    syncLimit=5
    electionAlg=3
    electionPort=3888
    quorumPort=2888
    peerType=0
    [root@localhost bin]# 
     
      
     
      
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##### cons 显示连接到服务端的信息 #####

[root@localhost bin]# echo cons | nc 192.168.0.68 2181
     /192.168.0.68:49354[0](queued=0,recved=1,sent=0)

\[root@localhost bin\]\#

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##### envi 显示环境变量信息 #####

[root@localhost bin]# echo envi | nc 192.168.0.68 2181
    Environment:
    zookeeper.version=3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
    host.name=localhost
    java.version=1.8.0_111
    java.vendor=Oracle Corporation
    java.home=/usr/local/jdk1.8.0_111/jre
    java.class.path=/usr/home/zookeeper-3.4.11/bin/../build/classes:/usr/home/zookeeper-3.4.11/bin/../build/lib/*.jar:/usr/home/zookeeper-3.4.11/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/home/zookeeper-3.4.11/bin/../lib/slf4j-api-1.6.1.jar:/usr/home/zookeeper-3.4.11/bin/../lib/netty-3.10.5.Final.jar:/usr/home/zookeeper-3.4.11/bin/../lib/log4j-1.2.16.jar:/usr/home/zookeeper-3.4.11/bin/../lib/jline-0.9.94.jar:/usr/home/zookeeper-3.4.11/bin/../lib/audience-annotations-0.5.0.jar:/usr/home/zookeeper-3.4.11/bin/../zookeeper-3.4.11.jar:/usr/home/zookeeper-3.4.11/bin/../src/java/lib/*.jar:/usr/home/zookeeper-3.4.11/bin/../conf:
    java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
    java.io.tmpdir=/tmp
    java.compiler=<NA>
    os.name=Linux
    os.arch=amd64
    os.version=3.10.0-514.10.2.el7.x86_64
    user.name=root
    user.home=/root
    user.dir=/usr/home/zookeeper-3.4.11/bin
    [root@localhost bin]#
     
      
     
      
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##### mntr 查看zk的健康信息 #####

[root@localhost bin]# echo mntr | nc 192.168.0.68 2181
    zk_version  3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
    zk_avg_latency  0
    zk_max_latency  4
    zk_min_latency  0
    zk_packets_received 68
    zk_packets_sent 67
    zk_num_alive_connections    1
    zk_outstanding_requests 0
    zk_server_state follower
    zk_znode_count  10
    zk_watch_count  0
    zk_ephemerals_count 0
    zk_approximate_data_size    124
    zk_open_file_descriptor_count   32
    zk_max_file_descriptor_count    4096
    [root@localhost bin]# 
     
      
     
      
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##### wchs 展示watch的信息 #####

[root@localhost bin]# echo wchs | nc 192.168.0.68 2181
    0 connections watching 0 paths
    Total watches:0
    [root@localhost bin]# 
    
     
      
     
      
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##### wchc和wchp 显示session的watch信息 path的watch信息 #####

*  需要在 配置`zoo.cfg`文件中添加 `4lw.commands.whitelist=*`

[root@localhost bin]# echo wchc | nc 192.168.0.68 2181
    wchc is not executed because it is not in the whitelist.
    [root@localhost bin]# echo wchp | nc 192.168.0.68 2181
    wchp is not executed because it is not in the whitelist.
     
      
     
      
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## 总结 ##

熟悉`zookeeper`基础命令操作后，再使用`zookeeper`提供的`api`或者第三方封装的`api`,会感觉一目了然。

## 推荐文章 ##

1.  [Java创建区块链系列][Java]
2.  [Spring Security源码分析系列][Spring Security]
3.  [Spring Data Jpa 系列][Spring Data Jpa]
4.  [【译】数据结构中关于树的一切（java版）][java]
5.  [SpringBoot+Docker+Git+Jenkins实现简易的持续集成和持续部署][SpringBoot_Docker_Git_Jenkins]

--------------------

[https_blog.csdn.net_qiunian144084_article_details_79192819]: https://blog.csdn.net/qiunian144084/article/details/79192819
[https_blog.csdn.net_hohoo1990_article_details_78617336]: https://blog.csdn.net/hohoo1990/article/details/78617336
[Java]: https://longfeizheng.github.io/categories/#%E5%8C%BA%E5%9D%97%E9%93%BE
[Spring Security]: https://longfeizheng.github.io/categories/#Security
[Spring Data Jpa]: https://longfeizheng.github.io/categories/#JPA
[java]: https://longfeizheng.github.io/2018/04/16/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%B8%AD%E4%BD%A0%E9%9C%80%E8%A6%81%E7%9F%A5%E9%81%93%E7%9A%84%E5%85%B3%E4%BA%8E%E6%A0%91%E7%9A%84%E4%B8%80%E5%88%87/
[SpringBoot_Docker_Git_Jenkins]: https://longfeizheng.github.io/2018/04/22/SpringBoot+Docker+Git+Jenkins%E5%AE%9E%E7%8E%B0%E7%AE%80%E6%98%93%E7%9A%84%E6%8C%81%E7%BB%AD%E9%9B%86%E6%88%90%E5%92%8C%E9%83%A8%E7%BD%B2/