一、ZooKeeper簡介

ZooKeeper作為一個開源的分散式應用協調系統，用來完成統一命名服務、狀態同步服務、叢集管理、分散式應用配置項的管理等工作。

ZooKeeper是一種分散式協調服務，用於管理大型主機。在分散式環境中協調和管理服務是一個複雜的過程。ZooKeeper通過其簡單的架構和API解決了這個問題。 ZooKeeper允許開發人員專注於核心應用程式邏輯，而不必擔心應用程式的分散式特性。

二、ZooKeeper下載、啟動

1.在windows下

直接解壓到所需要放置的目錄，如：C:\Program Files\下。

進入zookeeper-3.4.9\conf目錄，將zoo_sample.cfg拷貝為zoo.cfg。

配置zoo.cnf，分別配置dataDir和dataLogDir：

進入到zookeeper-3.4.9\bin目錄，點選zkServer.cmd啟動：

啟動：

檢視啟動後的dataDir和dataLogDir：

進入到zookeeper-3.4.9\bin目錄，點選zkCli.cmd啟動：

輸入：stat /等命令檢查

2.在centos環境下：

2.tar -zxvf zookeeper-3.4.9.tar.gz

3.mv zookeeper-3.4.9 /usr/local/zookeeper

4.cd /usr/local/zookeeper/conf

5.cp zoo_sample.cfg zoo.cfg（拷貝zoo_sample.cfg為zoo.cfg ）

6.修改zoo.cfg，內容為

tickTime=2000
dataDir=/usr/local/zookeeper/data
dataLogDir=/usr/local/zookeeper/logs
clientPort=2181

./zkServer.sh start

$./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
 

$./zkCli.sh 
Connecting to localhost:2181
2018-04-11 18:16:07,179 [myid:] - INFO  [main:[email protected]] - Client environment:zookeeper.version=3.4.9-1757313, built on 08/23/2016 06:50 GMT
2018-04-11 18:16:07,184 [myid:] - INFO  [main:[email protected]] - Client environment:host.name=localhost
2018-04-11 18:16:07,184 [myid:] - INFO  [main:[email protected]] - Client environment:java.version=1.8.0_144
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.vendor=Oracle Corporation
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.home=/usr/local/java/jre
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/bin/../lib/netty-3.10.5.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.9.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf:
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.io.tmpdir=/tmp
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:java.compiler=<NA>
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:os.name=Linux
2018-04-11 18:16:07,187 [myid:] - INFO  [main:[email protected]] - Client environment:os.arch=amd64
2018-04-11 18:16:07,188 [myid:] - INFO  [main:[email protected]] - Client environment:os.version=2.6.32-573.el6.x86_64
2018-04-11 18:16:07,188 [myid:] - INFO  [main:[email protected]] - Client environment:user.name=root
2018-04-11 18:16:07,188 [myid:] - INFO  [main:[email protected]] - Client environment:user.home=/root
2018-04-11 18:16:07,188 [myid:] - INFO  [main:[email protected]] - Client environment:user.dir=/usr/local/zookeeper/bin
2018-04-11 18:16:07,190 [myid:] - INFO  [main:[email protected]] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 [email protected]
Welcome to ZooKeeper!
2018-04-11 18:16:07,311 [myid:] - INFO  [main-SendThread(localhost:2181):[email protected]] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2018-04-11 18:16:07,525 [myid:] - INFO  [main-SendThread(localhost:2181):[email protected]] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2018-04-11 18:16:07,562 [myid:] - INFO  [main-SendThread(localhost:2181):[email protected]] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x162b433dca70000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

9.命令：

三、Zkui安裝配置

1.環境準備（需要安裝git、maven、jdk環境）

git clone https://github.com/DeemOpen/zkui.git

$ git clone https://github.com/DeemOpen/zkui.git
Cloning into 'zkui'...
remote: Counting objects: 527, done.
remote: Total 527 (delta 0), reused 0 (delta 0), pack-reused 526
Receiving objects: 100% (527/527), 477.61 KiB | 259.00 KiB/s, done.
Resolving deltas: 100% (217/217), done.

3.cd /zkui

4.mvn clean install（通過maven構建，時間會比較長）

5.在target下會生成zkui-2.0-SNAPSHOT.jar和zkui-2.0-SNAPSHOT-jar-with-dependencies.jar檔案。

6.將zkui下的config.cfg檔案拷貝到zkui/target/下（不然啟動失敗）。

7.啟動java -jar zkui-2.0-SNAPSHOT-jar-with-dependencies.jar（或者nohup java -jar zkui-2.0-SNAPSHOT-jar-with-dependencies.jar &）

8.訪問：（http://localhost:9090/）

9.登入：（{ "username":"admin" , "password":"manager","role": "ADMIN" }）

ZooKeeper的安裝和Zkui的安裝已經完成，下一步是ZooKeeper的使用。

新手一枚，歡迎拍磚~ ~ ~