【hadoop】zookeeper的shell操作

前言

上一篇讲了zookeeper的部署，现在可以简单的操作一下

一、启动zookeeper集群

进入zookeeper安装目录下的bin目录内，通过命令启动

./zkServer.sh start

通过命令查看节点状态

./zkServer.sh status

通过命令关闭

./zkServer.sh stop

二、连接zookeeper服务

启动zookeeper服务之后，输入以下命令，连接到Zookeeper服务，

注意：如果没有配置环境变量在zookeeper的安装目录下的bin目录下执行：

./zkCli.sh -server localhost:2181

连接成功后显示：

到这里后我们就很开心了，接下来就可以进行操作了，下面介绍一些zookeeper的shell基本操作

三、shell基本操作

• 查看节点：ls path [watch] 或 get path [watch] 或 ls2 path [watch]
  • ls 命令可以列出 Zookeeper 指定节点下的所有子节点，只能查看指定节点下的第一级的所有子节点；
  • get 命令可以获取 Zookeeper 指定节点的数据内容和属性信息
  • ls2命令可以列出 Zookeeper 指定节点下的所有子节点及属性信息

[zk: localhost:2181(CONNECTED) 13] get /                      
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x800000008
cversion = 8
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 2
[zk: localhost:2181(CONNECTED) 14] ls /
[zookeeper, test0000000004]
[zk: localhost:2181(CONNECTED) 15] ls2 /
[zookeeper, test0000000004]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x800000008
cversion = 8
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 2

• 创建节点：create [-s] [-e] path data acl

其中，-s 或-e 分别指定节点特性，顺序或临时节点，若不指定，则表示持久节点；acl 用来进行权限控制。

• 创建顺序节点：

[zk: localhost:2181(CONNECTED) 8] create -s /test 123
Created /test0000000004
[zk: localhost:2181(CONNECTED) 9] 

• 创建临时节点：

[zk: localhost:2181(CONNECTED) 16] create -e /test-tmp 123tmp
Created /test-tmp

• 创建永久节点：

[zk: localhost:2181(CONNECTED) 17] create /test-p 123p
Created /test-p

• 查看节点内容：get path [watch]

[zk: localhost:2181(CONNECTED) 21] get /test-p
123p
cZxid = 0x80000000a
ctime = Wed Jul 04 23:57:01 CST 2018
mZxid = 0x80000000a
mtime = Wed Jul 04 23:57:01 CST 2018
pZxid = 0x80000000a
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0

• 更改节点信息：set path data [version]
data 就是要更新的新内容，version 表示数据版本。

[zk: localhost:2181(CONNECTED) 22] set /test-p 123456
cZxid = 0x80000000a
ctime = Wed Jul 04 23:57:01 CST 2018
mZxid = 0x80000000b
mtime = Thu Jul 05 00:01:59 CST 2018
pZxid = 0x80000000a
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0
[zk: localhost:2181(CONNECTED) 23] get /test-p       
123456
cZxid = 0x80000000a
ctime = Wed Jul 04 23:57:01 CST 2018
mZxid = 0x80000000b
mtime = Thu Jul 05 00:01:59 CST 2018
pZxid = 0x80000000a
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0

• 删除节点：delete path [version] 若删除节点存在子节点，那么无法删除该节点，必须先删除子节点，再删除父节点。
  Rmr path 递归删除节点。

[zk: localhost:2181(CONNECTED) 0] ls /
[test-p, zookeeper, test0000000004]
[zk: localhost:2181(CONNECTED) 1] delete /test0000000004
[zk: localhost:2181(CONNECTED) 2] ls /
[test-p, zookeeper]
[zk: localhost:2181(CONNECTED) 9] ls /            
[test-p, zookeeper, test]
[zk: localhost:2181(CONNECTED) 10] rmr /test       
[zk: localhost:2181(CONNECTED) 11] ls /     
[test-p, zookeeper]

• quota
  setquota -n|-b val path 对节点增加限制
  n:表示子节点的最大个数
  b:表示数据值的最大长度
  val:子节点最大个数或数据值的最大长度
  path:节点路径

[zk: localhost:2181(CONNECTED) 13] setquota -n 2 /test-p
Comment: the parts are option -n val 2 path /test-p

• listquota path 列出指定节点的 quota

[zk: localhost:2181(CONNECTED) 14] listquota /test-p    
absolute path is /zookeeper/quota/test-p/zookeeper_limits
Output quota for /test-p count=2,bytes=-1
Output stat for /test-p count=1,bytes=6

子节点个数为 2,数据长度-1 表示没限制

• delquota [-n|-b] path 删除 quota

[zk: localhost:2181(CONNECTED) 15] delquota /test-p
[zk: localhost:2181(CONNECTED) 16] listquota /test-p
absolute path is /zookeeper/quota/test-p/zookeeper_limits
quota for /test-p does not exist.

• 其他命令
  • history : 列出命令历史

[zk: localhost:2181(CONNECTED) 17] history
7 - ls /
8 - create /test 111
9 - ls /
10 - rmr /test
11 - ls /
12 - listquota /test-p
13 - setquota -n 2 /test-p
14 - listquota /test-p
15 - delquota /test-p
16 - listquota /test-p
17 - history
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

• redo：该命令可以重新执行指定命令编号的历史命令,命令编号可以通过history 查看