0.ZooKeeper文檔

http://zookeeper.apache.org/doc/r3.4.11/zookeeperOver.html

1.準備

在CentOS7上安裝zookeeper時，如下工具必須要有：wget

如果沒有，則進行安裝：

yum -y install wget

下載到本地

1. cd /usr/local/src
2. wget http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.11/zookeeper-3.4.11.tar.gz

解壓

tar -xzvf zookeeper-3.4.11.tar.gz
 

創建的安裝目錄，並移動解壓後的目錄到其下

1. mkdir -p ../zookeeper
2. mv zookeeper-3.4.11/ ../zookeeper

創建數據目錄，用於存放數據

mkdir -p /var/lib/zookeeper

創建配置

1. cd ../zookeeper/zookeeper-3.4.11/conf
2. cp zoo_sample.cfg zoo.cfg

修改其中配置dataDir：

vi zoo.cfg

dataDir=/var/lib/zookeeper

3.啟動服務

1. cd ..
2. ./bin/zkServer.sh start

輸出如下信息，表示啟動成功

1. Connecting to 127.0.0.1:2181
2. 2018-02-09 14:56:10,914 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
3. 2018-02-09 14:56:10,922 [myid:] - INFO [main:Environment@100] - Client environment:host.name=jiaodacailei-thinkpad-centos7
4. 2018-02-09 14:56:10,922 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_161
5. 2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
6. 2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/local/jdk/jdk1.8.0_161/jre
7. 2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/zookeeper-3.4.11/bin/../build/classes:/usr/local/zookeeper/zookeeper-3.4.11/bin/../build/lib/*.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/netty-3.10.5.Final.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../zookeeper-3.4.11.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../src/java/lib/*.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../conf::/usr/local/jdk/jdk1.8.0_161/lib/dt.jar:/usr/local/jdk/jdk1.8.0_161/lib/tools.jar:/usr/local/jdk/jdk1.8.0_161/jre/lib/dt.jar
8. 2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
9. 2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
10. 2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
11. 2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
12. 2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64
13. 2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-693.el7.x86_64
14. 2018-02-09 14:56:10,929 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
15. 2018-02-09 14:56:10,929 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
16. 2018-02-09 14:56:10,929 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper/zookeeper-3.4.11
17. 2018-02-09 14:56:10,932 [myid:] - INFO [main:ZooKeeper@441] - Initiating client connection, connectString=127.0.0.1:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@579bb367
18. Welcome to ZooKeeper!
19. 2018-02-09 14:56:10,983 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1035] - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
20. JLine support is enabled
21. 2018-02-09 14:56:11,141 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@877] - Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session
22. [zk: 127.0.0.1:2181(CONNECTING) 0] 2018-02-09 14:56:11,242 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1302] - Session establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid = 0x1000150f9ff0000, negotiated timeout = 30000
24. WATCHER::
26. WatchedEvent state:SyncConnected type:None path:null

4.啟動客戶端

./bin/zkCli.sh -server 127.0.0.1:2181

輸入如下，等待用戶輸入命令：

[zk: 127.0.0.1:2181(CONNECTED) 0]

5.獲取幫助

輸入如下命令，可以獲取幫助信息：

help

輸出信息如下：

1. ZooKeeper -server host:port cmd args
2. stat path [watch]
3. set path data [version]
4. ls path [watch]
5. delquota [-n|-b] path
6. ls2 path [watch]
7. setAcl path acl
8. setquota -n|-b val path
9. history
10. redo cmdno
11. printwatches on|off
12. delete path [version]
13. sync path
14. listquota path
15. rmr path
16. get path [watch]
17. create [-s] [-e] path data acl
18. addauth scheme auth
19. quit
20. getAcl path
21. close
22. connect host:port

上面是所有可以使用的命令

6.ls命令

ls /

默認根節點下有一個zookeeper節點

[zookeeper]

7.創建節點

創建節點采用create命令，創建之後查看根路徑，發現多了一個節點；

通過get命令，可以查詢節點路徑對應的數據

1. [zk: 127.0.0.1:2181(CONNECTED) 4] create /zk_test test_data
2. Created /zk_test

1. [zk: 127.0.0.1:2181(CONNECTED) 6] ls /
2. [zookeeper, zk_test]

1. [zk: 127.0.0.1:2181(CONNECTED) 7] get /zk_test
2. test_data
3. cZxid = 0x2
4. ctime = Fri Feb 09 15:19:11 CST 2018
5. mZxid = 0x2
6. mtime = Fri Feb 09 15:19:11 CST 2018
7. pZxid = 0x2
8. cversion = 0
9. dataVersion = 0
10. aclVersion = 0
11. ephemeralOwner = 0x0
12. dataLength = 9
13. numChildren = 0

8.修改節點數據

set命令可以修改路徑對應的節點數據，修改後再通過get命令查看結果

[zk: 127.0.0.1:2181(CONNECTED) 8] set /zk_test test_data_change

cZxid = 0x2
ctime = Fri Feb 09 15:19:11 CST 2018
mZxid = 0x3
mtime = Fri Feb 09 15:21:31 CST 2018
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 16
numChildren = 0

[zk: 127.0.0.1:2181(CONNECTED) 10] get /zk_test

test_data_change
cZxid = 0x2
ctime = Fri Feb 09 15:19:11 CST 2018
mZxid = 0x3
mtime = Fri Feb 09 15:21:31 CST 2018
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 16
numChildren = 0

9.刪除節點

delete命令可以刪除路徑對應的節點，刪除之後，通過ls命令查看其父路徑，可以看到節點已經減少一個

1. [zk: 127.0.0.1:2181(CONNECTED) 11] delete /zk_test
2. [zk: 127.0.0.1:2181(CONNECTED) 12] ls /
3. [zookeeper]

10.退出客戶端

quit

11.停止服務

./bin/zkServer.sh stop

在CentOS7上安裝和使用ZooKeeper最新版本（V3.4.11）