ZooKeeper做独立服务器运行(上)

一、ZooKeeper安装及配置

版本：ZooKeeper v3.4.6稳定版

要设置ZooKeeper以单独服务器的模式运行是非常直接的。服务器包含在单个的JAR文件内，因此安装就只需创建一个配置文件。

一旦下载了ZooKeeper稳定版，那么解压它，并进入ZooKeeper的根目录。

$ wgethttp://mirror.bit.edu.cn/apache/zookeeper/stable/zookeeper-3.4.6.tar.gz
$ mvzookeeper-3.4.6 zookeeper

要启动ZooKeeper，还需要一个配置文件，可以创建conf/zoo.cfg配置文件，内容如下：

tickTime=2000
dataDir=/var/lib/zookeeper
clientPort=2181

zoo.cfg是配置文件的默认名字。下面我们说说配置文件的各项含义。

tickTime：ZooKeeper使用的基本时间单元（毫秒为单位）。它用于做心跳和最小的会话超时机制。

dataDir：存储内容数据库快照的目录，除非另行指定，否则更新的事务处理日志也会记录到数据库。

clientPort：客户端连接监听的端口

 

二、ZooKeeper做独立服务器运行

创建了配置文件后，就可以启动ZooKeeper了。

$bin/zkServer.sh start
JMXenabled by default
Usingconfig: /home/chuser/zookeeper/bin/../conf/zoo.cfg
Startingzookeeper ... STARTED

ZooKeeper使用Log4J记录日志消息，你可以从控制台或日志输出文件来查看日志，具体取决于Log4J的配置。

三、ZooKeeper客户端连接

客户端连接到ZooKeeper

一旦ZooKeeper运行了，要连接到ZooKeeper，你有几个选择：

1）使用Java

$bin/zkCli.sh -server 127.0.0.1:2181
Connecting to 127.0.0.1:2181
2014-05-02 07:39:20,388 [myid:] - INFO  [main:Environment@100] - Clientenvironment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2014-05-02 07:39:20,394 [myid:] - INFO  [main:Environment@100] - Clientenvironment:host.name=10.0.0.13
2014-05-02 07:39:20,394 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.version=1.7.0_51
2014-05-02 07:39:20,398 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.vendor=Oracle Corporation
2014-05-02 07:39:20,399 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.home=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.51.x86_64/jre
2014-05-02 07:39:20,399 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.class.path=/home/chuser/zookeeper/bin/../build/classes:/home/chuser/zookeeper/bin/../build/lib/*.jar:/home/chuser/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/chuser/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/home/chuser/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/home/chuser/zookeeper/bin/../lib/log4j-1.2.16.jar:/home/chuser/zookeeper/bin/../lib/jline-0.9.94.jar:/home/chuser/zookeeper/bin/../zookeeper-3.4.6.jar:/home/chuser/zookeeper/bin/../src/java/lib/*.jar:/home/chuser/zookeeper/bin/../conf:
2014-05-02 07:39:20,399 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2014-05-02 07:39:20,399 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.io.tmpdir=/tmp
2014-05-02 07:39:20,400 [myid:] - INFO  [main:Environment@100] - Clientenvironment:java.compiler=
2014-05-02 07:39:20,400 [myid:] - INFO  [main:Environment@100] - Clientenvironment:os.name=Linux
2014-05-02 07:39:20,400 [myid:] - INFO  [main:Environment@100] - Clientenvironment:os.arch=amd64
2014-05-02 07:39:20,400 [myid:] - INFO  [main:Environment@100] - Clientenvironment:os.version=2.6.32-431.3.1.el6.x86_64
2014-05-02 07:39:20,400 [myid:] - INFO  [main:Environment@100] - Clientenvironment:user.name=chuser
2014-05-02 07:39:20,401 [myid:] - INFO  [main:Environment@100] - Clientenvironment:user.home=/home/chuser
2014-05-02 07:39:20,401 [myid:] - INFO  [main:Environment@100] - Clientenvironment:user.dir=/home/chuser/zookeeper
2014-05-02 07:39:20,403 [myid:] - INFO  [main:ZooKeeper@438] - Initiating clientconnection, connectString=127.0.0.1:2181 sessionTimeout=30000watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@748197b2
Welcome to ZooKeeper!
2014-05-02 07:39:20,448 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@975] - Openingsocket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt toauthenticate using SASL (unknown error)
JLine support is enabled
2014-05-02 07:39:20,460 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@852] - Socketconnection established to 127.0.0.1/127.0.0.1:2181, initiating session
2014-05-02 07:39:20,491 [myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1235] - Sessionestablishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid =0x145bbdc9b460001, negotiated timeout = 30000
 
WATCHER::
 
WatchedEvent state:SyncConnected type:Nonepath:null
[zk: 127.0.0.1:2181(CONNECTED) 0]

2）使用C语言

在ZooKeeper的源码src/c子目录通过运行make cli_mt或make cli_st，编译多线程客户端cli_mt或单线程客户端cli_st，再运行客户端：

LD_LIBRARY_PATH=. cli_mt 127.0.0.1:2181

或

LD_LIBRARY_PATH=. cli_st 127.0.0.1:2181