Zookeeper系列一：Zookeeper基礎命令操作

有些事不是努力就可以改變的，五十塊的人民幣設計的再好看，也沒有一百塊的招人喜歡。

前言

由於公司年底要更換辦公地點，所以最近投了一下簡歷，發現面試官現在很喜歡問dubbo、zookeeper和高併發等。由於公司沒有使用dubbo，只知道dubbo是一個遠端服務呼叫的分散式框架，zookeeper為分散式應用程式協調服務。因此，本週查閱資料整理下zookeeper學習筆記。

安裝zookeeper

安裝參考連結https://blog.csdn.net/qiunian144084/article/details/79192819

基礎命令操作

啟動zk服務

./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 啟動zk
./zkCli.sh start

檢視zk的執行狀態

./zkServer.sh status 由於我已經配置了zk的叢集，所以此處顯示狀態為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

客戶端連結zk

[root@localhost bin]# ./zkCli.sh 
......
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]

help 檢視客戶端幫助命令

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]

ls 檢視

ls 檢視命令(niocoder是我測試叢集建立的節點，預設只有zookeeper一個節點)

[zk: localhost:2181(CONNECTED) 1] ls /
[niocoder, zookeeper]
[zk: localhost:2181(CONNECTED) 2] ls /zookeeper 
[quota]
[zk: localhost:2181(CONNECTED) 4] ls /zookeeper/quota
[]

get 獲取節點資料和更新資訊

get內容為空
cZxid ：建立節點的id
ctime ：節點的建立時間
mZxid ：修改節點的id
mtime ：修改節點的時間
pZxid ：子節點的id
cversion : 子節點的版本
dataVersion ：當前節點資料的版本
aclVersion ：許可權的版本
ephemeralOwner ：判斷是否是臨時節點
dataLength ：資料的長度
numChildren ：子節點的數量

[zk: localhost:2181(CONNECTED) 7] get /zookeeper #下面空行說明節點內容為空

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]

stat 獲得節點的更新資訊

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

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]

create 建立節點

create [-s] [-e] path data acl 可以注意一下各個版本的變化

#建立merryyou節點，節點的內容為merryyou
[zk: localhost:2181(CONNECTED) 1] create /merryyou merryyou
Created /merryyou
#獲得merryyou節點內容
[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

create -e 建立臨時節點

create -e

#建立臨時節點
[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] 
#斷開重連之後，臨時節點自動消失
WATCHER::

WatchedEvent state:SyncConnected type:None path:null
#因為預設的心跳機制，此時查詢臨時節點還存在
[zk: localhost:2181(CONNECTED) 0] ls /merryyou
[temp]
#再次查詢，臨時節點消失
[zk: localhost:2181(CONNECTED) 1] ls /merryyou
[]
[zk: localhost:2181(CONNECTED) 2]

create -s 建立順序節點自動累加

create -s

# 建立順序節點，順序節點會自動累加
[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

set path data [version] 修改節點

[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
# 修改節點內容為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
#再次查詢，節點內容已經修改
[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 根據版本號更新 dataVersion 樂觀鎖
[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
#因為資料的版本號已經修改為2 再次使用版本號1修改節點提交錯誤
[zk: localhost:2181(CONNECTED) 10] set /merryyou test-merryyou 1
version No is not valid : /merryyou

delete path [version] 刪除節點

[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] 
#版本號操作與set類似 version

watcher通知機制

關於watcher機制大體的理解可以為，當每個節點發生變化，都會觸發watcher事件，類似於mysql的觸發器。zk中 watcher是一次性的，觸發後立即銷燬。可以參考https://blog.csdn.net/hohoo1990/article/details/78617336
- stat path [watch] 設定watch事件
- get path [watch]設定watch事件
- 子節點建立和刪除時觸發watch事件，子節點修改不會觸發該事件

stat path [watch] 設定watch事件

#新增watch 事件
[zk: localhost:2181(CONNECTED) 18] stat /longfei watch
Node does not exist: /longfei
#建立longfei節點時觸發watcher事件
[zk: localhost:2181(CONNECTED) 19] create /longfei test

WATCHER::

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

get path [watch] 設定watch事件

#使用get命令新增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
#修改節點觸發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] 
#刪除觸發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]

ACL許可權控制

ZK的節點有5種操作許可權：CREATE、READ、WRITE、DELETE、ADMIN 也就是增、刪、改、查、管理許可權，這5種許可權簡寫為crwda(即：每個單詞的首字元縮寫)。
注：這5種許可權中，delete是指對子節點的刪除許可權，其它4種許可權指對自身節點的操作許可權

身份的認證有4種方式：
- world：預設方式，相當於全世界都能訪問
- auth：代表已經認證通過的使用者(cli中可以通過addauth digest user:pwd 來新增當前上下文中的授權使用者)
- digest：即使用者名稱:密碼這種方式認證，這也是業務系統中最常用的
- ip：使用Ip地址認證

使用[scheme:id:permissions]來表示acl許可權

getAcl:獲取某個節點的acl許可權資訊

#獲取節點許可權資訊預設為 world:cdrwa任何人都可以訪問
[zk: localhost:2181(CONNECTED) 34] getAcl /merryyou
'world,'anyone
: cdrwa
[zk: localhost:2181(CONNECTED) 35]

setAcl 設定許可權

[zk: localhost:2181(CONNECTED) 35] create /merryyou/test test
Created /merryyou/test
[zk: localhost:2181(CONNECTED) 36] getAcl /merryyou/test
'world,'anyone
: cdrwa
#設定節點許可權 crwa 不允許刪除
[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
#查詢剛才設定的acl許可權資訊 crwa 沒有刪除許可權
[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
#刪除子節點的時候提交許可權不足
[zk: localhost:2181(CONNECTED) 40] delete /merryyou/test/abc
Authentication is not valid : /merryyou/test/abc
#設定節點的許可權資訊為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
#可以成功刪除
[zk: localhost:2181(CONNECTED) 43] delete /merryyou/test/abc             
[zk: localhost:2181(CONNECTED) 46] ls /merryyou/test
[]
[zk: localhost:2181(CONNECTED) 47] 
#設定節點資訊為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
#獲取 設定都提示許可權不足
[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]

acl Auth 密碼明文設定

[zk: localhost:2181(CONNECTED) 53] create /niocoder/merryyou merryyou
Created /niocoder/merryyou
#查詢預設節點許可權資訊
[zk: localhost:2181(CONNECTED) 54] getAcl /niocoder/merryyou
'world,'anyone
: cdrwa
[zk: localhost:2181(CONNECTED) 55] 
#使用auth設定節點許可權資訊
[zk: localhost:2181(CONNECTED) 2] setAcl /niocoder/merryyou auth:test:test:cdrwa  
Acl is not valid : /niocoder/merryyou
# 註冊test:test 賬號密碼
[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
#查詢節點許可權資訊 密碼為密文格式
[zk: localhost:2181(CONNECTED) 5] getAcl /niocoder/merryyou
'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
: cdrwa
[zk: localhost:2181(CONNECTED) 6]

acl digest 密碼密文設定

[zk: localhost:2181(CONNECTED) 13] create /names test
Created /names
[zk: localhost:2181(CONNECTED) 14] getAcl /names
'world,'anyone
: cdrwa
#使用digest設定節點的許可權資訊 密碼為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
#查詢節點許可權資訊
[zk: localhost:2181(CONNECTED) 16] getAcl /names
'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
: cdra
#獲取節點資訊提示許可權不足
[zk: localhost:2181(CONNECTED) 5] get /names
Authentication is not valid : /names
# 註冊賬戶
[zk: localhost:2181(CONNECTED) 4] addauth digest test:test
# 可以正常獲取
[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
#由於沒有設定寫許可權不能修改節點 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]

acl ip 控制客戶端

[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
# 新增ip控制的許可權資訊
[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]

acl super超級管理員

使用super許可權需要修改zkServer.sh，新增super管理員，重啟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 &

#重啟進入zkCli
#由於之前設定ip許可權，所以不允許訪問
[zk: localhost:2181(CONNECTED) 2] ls /niocoder/ip
Authentication is not valid : /niocoder/ip
#登入賬號資訊，即為管理員賬號
[zk: localhost:2181(CONNECTED) 3] addauth digest test:test
#正常訪問，節點內容為空
[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]

四字命令Four Letter Words

使用四字命令需要安裝nc命令,(yum install nc)

stat 檢視狀態資訊

[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]#

ruok 檢視zookeeper是否啟動

[root@localhost bin]# echo ruok | nc 192.168.0.68 2181
imok[root@localhost bin]#

dump 列出沒有處理的節點，臨時節點

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]#

conf 檢視伺服器配置

[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]#

cons 顯示連線到服務端的資訊

[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]#

envi 顯示環境變數資訊

[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]#

mntr 檢視zk的健康資訊

[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]#

wchs 展示watch的資訊

[root@localhost bin]# echo wchs | nc 192.168.0.68 2181
0 connections watching 0 paths
Total watches:0
[root@localhost bin]#

wchc和wchp 顯示session的watch資訊 path的watch資訊

需要在配置zoo.cfg檔案中新增 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.

總結

熟悉zookeeper基礎命令操作後，再使用zookeeper提供的api或者第三方封裝的api,會感覺一目瞭然。

Zookeeper系列一：Zookeeper基礎命令操作

前言

安裝zookeeper

基礎命令操作

啟動zk服務

檢視zk的執行狀態

客戶端連結zk

help 檢視客戶端幫助命令

ls 檢視

get 獲取節點資料和更新資訊

stat 獲得節點的更新資訊

ls2 ls命令和stat命令的整合

create 建立節點

create -e 建立臨時節點

create -s 建立順序節點自動累加

set path data [version] 修改節點

delete path [version] 刪除節點

watcher通知機制

stat path [watch] 設定watch事件

get path [watch] 設定watch事件

ACL許可權控制

getAcl:獲取某個節點的acl許可權資訊

setAcl 設定許可權

acl Auth 密碼明文設定

acl digest 密碼密文設定

acl ip 控制客戶端

acl super超級管理員

四字命令Four Letter Words

stat 檢視狀態資訊

ruok 檢視zookeeper是否啟動

dump 列出沒有處理的節點，臨時節點

conf 檢視伺服器配置

cons 顯示連線到服務端的資訊

envi 顯示環境變數資訊

mntr 檢視zk的健康資訊

wchs 展示watch的資訊

wchc和wchp 顯示session的watch資訊 path的watch資訊

總結

推薦文章

相關文章

Zookeeper系列一：Zookeeper基礎命令操作

前言

安裝zookeeper

基礎命令操作

啟動zk服務

檢視zk的執行狀態

客戶端連結zk

help 檢視客戶端幫助命令

ls 檢視

get 獲取節點資料和更新資訊

stat 獲得節點的更新資訊

ls2 ls命令和stat命令的整合

create 建立節點

create -e 建立臨時節點

create -s 建立順序節點 自動累加

set path data [version] 修改節點

delete path [version] 刪除節點

watcher通知機制

stat path [watch] 設定watch事件

get path [watch] 設定watch事件

ACL許可權控制

getAcl:獲取某個節點的acl許可權資訊

setAcl 設定許可權

acl Auth 密碼明文設定

acl digest 密碼密文設定

acl ip 控制客戶端

acl super超級管理員

四字命令Four Letter Words

stat 檢視狀態資訊

ruok 檢視zookeeper是否啟動

dump 列出沒有處理的節點，臨時節點

conf 檢視伺服器配置

cons 顯示連線到服務端的資訊

envi 顯示環境變數資訊

mntr 檢視zk的健康資訊

wchs 展示watch的資訊

wchc和wchp 顯示session的watch資訊 path的watch資訊

總結

推薦文章

相關文章

create -s 建立順序節點自動累加