Centos zookeeper集群 dubbo 使用

前言

ZooKeeper是一个分布式的，开放源码的分布式应用程序协调服务，是Google的Chubby一个开源的实现，是Hadoop和Hbase的重要组件。它是一个为分布式应用提供一致性服务的软件，提供的功能包括：配置维护、域名服务、分布式同步、组服务等 [ 百度百科 ]

开始

1 .去官网，下载 ZooKeeper

 cd    /usr/local/ wget  http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.5.2-alpha/zookeeper-3.5.2-alpha.tar.gz

2 .创建文件夹，解压压缩包

 mkdir  -p  /usr/local/zookeeper tar  -zxvf  zookeeper-3.5.2-alpha.tar.gz -C /usr/local/zookeeper

3 .配置zookeeper文件

 cd  /usr/local/zookeeper/zookeeper-3.5.2-alpha/conf/ cp  zoo_sample.cfg zoo.cfg vi  /usr/local/zookeeper/zookeeper-3.5.2-alpha/conf/zoo.cfg

配置如下：

dataDir=/usr/local/zookeeper/zookeeper-3.5.2-alpha/data/server.1=192.168.0.118:2888:3888server.2=192.168.0.120:2888:3888server.3=192.168.0.121:2888:3888

注意，这里的server.1(myid)，需要在 /usr/local/zookeeper/zookeeper-3.5.2-alpha/data/下面创建文件名为 myid 内容是 1 来标识服务器

4 .配置环境变量，在zookeeper文件后面附加如下配置

 vi /etc/profile

配置如下：

 # idea - zookeeper-3.5.2 config start - 2017-09-01   export ZOOKEEPER_HOME=/usr/local/zookeeper/zookeeper-3.5.2-alpha/   export PATH=$ZOOKEEPER_HOME/bin:$PATH   export PATH # idea - zookeeper-3.5.2 config start - 2017-09-01

5 .刷新配置文件，并启动

  source       /etc/profile  cd           /usr/local/zookeeper/zookeeper-3.5.2-alpha/bin/  zkServer.sh  start  zkServer.sh  status  zkServer.sh  start-foreground  -- 启动错误信息 

6 .如果查看状态报错，请关闭防火墙，命令如下

  systemctl stop firewalld  systemctl disable firewalld

8 .成功状态如下

[root@localhost bin]#   zkServer.sh  status/usr/bin/javaZooKeeper JMX enabled by defaultUsing config: /usr/local/zookeeper/zookeeper-3.5.2-alpha/bin/../conf/zoo.cfgClient port found: 2181. Client address: localhost.Mode: follower

9 .dubbo中provider.xml配置如下：

    <dubbo:application name="hello-world-app"/>    <dubbo:registry  protocol="zookeeper"  address="192.168.0.118:2181,192.168.0.120:2181,192.168.0.121:2181"  />    <dubbo:service interface="com.alvis.service.interfaces.IDemoService" ref="demoService"  loadbalance="roundrobin"/>    <bean id="demoService" class="com.alvis.service.implementes.DemoService"/>

pom.xml中配置如下：

   <dependencies>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>dubbo</artifactId>            <version>2.5.3</version>        </dependency>        <dependency>            <groupId>com.github.sgroschupf</groupId>            <artifactId>zkclient</artifactId>            <version>0.1</version>        </dependency>    </dependencies>

10 .将服务打包成jar文件，发布到三个服务器中，使用命令开始运行服务

  java -jar /usr/local/dubbo/dubbo-provider.jar

11 .dubbo consumer多次调用可以看到如下信息，如果某个服务挂了，会自动切换到其他2个节点

Hello world, response form provider: 192.168.0.118:20880Hello world, response form provider: 192.168.0.120:20880Hello world, response form provider: 192.168.0.121:20880

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结束