zookeeper(2)——操作命令

ls

ls path 查看某个路径下目录列表,ls / 查看根目录下有一个zookeeper的目录。 目录就是一个节点。/ 根节点 zookeeper是子节点

[zk: localhost:2181(CONNECTED) 1] ls /
[zookeeper]

stat

查看节点状态信息。

[zk: localhost:2181(CONNECTED) 9] stat /
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1

cZxid Zookeeper为节点分配的Id
cTime 节点创建时间
mZxid 修改后的id
mtime 修改时间
pZxid 子节点id
cversion 子节点的version
dataVersion 当前节点数据的版本号
aclVersion 权限Version
dataLength 数据长度
numChildren 子节点个数

ls2

ls2 显示了数据的一些状态信息 是ls和stat命令的组合

[zk: localhost:2181(CONNECTED) 7] ls2 /
[zookeeper]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1

create

create /test testdata
Created /test

创建临时节点

[zk: localhost:2181(CONNECTED) 12] create -e /test/tmp tmpdata
Created /test/tmp

创建顺序节点

[zk: localhost:2181(CONNECTED) 4] create -s /test/sec sequencer
Created /test/sec0000000001

get

get path获取节点数据信息

get /test
testdata
cZxid = 0x2
ctime = Wed May 08 17:28:06 CST 2019
mZxid = 0x2
mtime = Wed May 08 17:28:06 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0

set

修改节点值

[zk: localhost:2181(CONNECTED) 5] set /test newdata
cZxid = 0x2
ctime = Wed May 08 17:28:06 CST 2019
mZxid = 0x7
mtime = Wed May 08 17:59:07 CST 2019
pZxid = 0x6
cversion = 3
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 1

如果节点不存在或修改失败

[zk: localhost:2181(CONNECTED) 7] set /test1 newdata1
Node does not exist: /test1

乐观锁修改
set pata data dataversion

[zk: localhost:2181(CONNECTED) 8] set /test new-data  1
cZxid = 0x2
ctime = Wed May 08 17:28:06 CST 2019
mZxid = 0x9
mtime = Wed May 08 18:02:29 CST 2019
pZxid = 0x6
cversion = 3
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 1
[zk: localhost:2181(CONNECTED) 9] set /test new-data  1
version No is not valid : /test

delete

删除节点

[zk: localhost:2181(CONNECTED) 23] delete /test0000000001
[zk: localhost:2181(CONNECTED) 24] delete /test0000000001
Node does not exist: /test0000000001

四字命令Four letter Words

zk可以通过它自身提供的简写命令来和服务器进行交互
安装nc命令
命令格式
echo [commond] | nc [ip] [port]
stat 查看zk的状态信息 以及是否mode

baxiangs-Mac-mini:~ baxiang$ echo stat | nc localhost 2181
Zookeeper version: 3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
Clients:
 /0:0:0:0:0:0:0:1:50696[0](queued=0,recved=1,sent=0)
 /127.0.0.1:50565[1](queued=0,recved=140,sent=140)

Latency min/avg/max: 0/0/7
Received: 865
Sent: 864
Connections: 2
Outstanding: 0
Zxid: 0x1d99
Mode: standalone
Node count: 19

ruok 查看当前zkserver是否启动，返回imok

echo ruok | nc localhost 2181
imok

dump 列出未经处理的回话和临时节点

$ echo dump | nc localhost 2181
SessionTracker dump:
Session Sets (3):
0 expire at Thu Jan 01 10:36:30 CST 1970:
0 expire at Thu Jan 01 10:36:40 CST 1970:
1 expire at Thu Jan 01 10:36:50 CST 1970:
    0x100000872ba0003
ephemeral nodes dump:
Sessions with Ephemerals (0):

conf 查看服务器配置

echo conf | nc localhost 2181
clientPort=2181
dataDir=/usr/local/var/run/zookeeper/data/version-2
dataLogDir=/usr/local/var/run/zookeeper/data/version-2
tickTime=2000
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=0

cons 展示连接到服务器的客户端信息

echo cons | nc localhost 2181
 /0:0:0:0:0:0:0:1:50728[0](queued=0,recved=1,sent=0)
 /127.0.0.1:50565[1](queued=0,recved=184,sent=184,sid=0x100000872ba0003,lop=PING,est=1557332837106,to=30000,lcxid=0x9,lzxid=0x1d99,lresp=9618134,llat=0,minlat=0,avglat=0,maxlat=2)

envi 查看环境变量配置
mntr 监控zk监控信息

echo mntr | nc localhost 2181
zk_version  3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
zk_avg_latency  0
zk_max_latency  7
zk_min_latency  0
zk_packets_received 942
zk_packets_sent 941
zk_num_alive_connections    2
zk_outstanding_requests 0
zk_server_state standalone
zk_znode_count  19
zk_watch_count  0
zk_ephemerals_count 0
zk_approximate_data_size    258
zk_open_file_descriptor_count   32
zk_max_file_descriptor_count    10240

wchs 展示watch的信息

$ echo wchs | nc localhost 2181
1 connections watching 1 paths
Total watches:1

wchc/wchp session与watch 以及path与watch信息