dubbo+zookeeper集群

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安装Dubbo，并利用zookeeper作为注册中心

环境准备:

了解dubbo相关信息http://dubbo.io/Home-zh.htm

dubbo安装:

     Zookeeper下载 download

zookeeper Install 伪分布式

wget http://www.apache.org/dist/zookeeper/stable/zookeeper-3.4.6.tar.gz

tar zxvf zookeeper-3.4.6.tar.gz

mv zookeeper-3.4.6 zookeeper-3.4.6-server-1

2.进入conf目录，复制配置文件，并修改参数

cp zoo_sample.cfg zoo.cfg

vi zoo.cfg

tickTime=2000  
initLimit=5  
syncLimit=2  
dataDir=/zk/zookeeper-3.4.6-server-1/zookeeper-3.4.6/data
dataLogDir=/zk/zookeeper-3.4.6-server-1/zookeeper-3.4.6/logs
clientPort=2182
server.1=127.0.0.1:8880:7770  
server.2=127.0.0.1:8881:7771  
server.3=127.0.0.1:8882:7772

其中需要修改的 dataDir dataLogDir clientPort ，端口不能重复! 一般我喜欢在conf同级目录下 新建 data 和 logs 文件夹

引用 http://coolxing.iteye.com/blog/1871009

• initLimit: zookeeper集群中的包含多台server, 其中一台为leader, 集群中其余的server为follower. initLimit参数配置初始化连接时, follower和leader之间的最长心跳时间. 此时该参数设置为5, 说明时间限制为5倍tickTime, 即5*2000=10000ms=10s.

• syncLimit: 该参数配置leader和follower之间发送消息, 请求和应答的最大时间长度. 此时该参数设置为2, 说明时间限制为2倍tickTime, 即4000ms.

• server.X=A:B:C 其中X是一个数字, 表示这是第几号server. A是该server所在的IP地址. B配置该server和集群中的leader交换消息所使用的端口. C配置选举leader时所使用的端口. 由于配置的是伪集群模式, 所以各个server的B, C参数必须不同.

cd /home/web/xiaolong.yuanxl/zookeeper-3.4.6-server-1/data

echo "1" > myid

4.同理 cp 出 zookerper-3.4.6-server-2 和 zookerper-3.4.6-server-3，注意修改 data 、 logs、clientPort 、myid 这4个地方，然后依次启动zk ( 关闭stop 重启restart 状态status ) 并看启动情况

我的server1,server2,server3的端口号分别为:2182,2183,2184;myid为1,2,3

启动这三个zookeeper

cd /zk/zookeeper-3.4.6-server-1/zookeeper-3.4.6/binsh zkServer.sh start  less ./zookeeper.out

[web@web02 bin]$ ps -ef | grep zoo web        553     1  0 10:22 ?        00:00:01 /usr/java/jdk1.6.0_20/bin/java -Dzookeepe
web        778     1  0 10:26 ?        00:00:01 /usr/java/jdk1.6.0_20/bin/
web       1167     1  0 10:37 ?        00:00:01 /usr/java/jdk1.6.0_20/bin/

leader信息


[root@4PNT_Dev1 bin]# pwd

/zk/zookeeper-3.4.6-server-3/zookeeper-3.4.6/bin

[root@4PNT_Dev1 bin]# sh zkServer.sh status

JMX enabled by default

Using config: /zk/zookeeper-3.4.6-server-3/zookeeper-3.4.6/bin/../conf/zoo.cfg

Mode: follower

[root@4PNT_Dev1 bin]# cd /zk/zookeeper-3.4.6-server-2/zookeeper-3.4.6/bin

[root@4PNT_Dev1 bin]# sh zkServer.sh status

JMX enabled by default

Using config: /zk/zookeeper-3.4.6-server-2/zookeeper-3.4.6/bin/../conf/zoo.cfg

Mode: leader

[root@4PNT_Dev1 bin]# cd /zk/zookeeper-3.4.6-server-1/zookeeper-3.4.6/bin

[root@4PNT_Dev1 bin]# sh zkServer.sh status

JMX enabled by default

Using config: /zk/zookeeper-3.4.6-server-1/zookeeper-3.4.6/bin/../conf/zoo.cfg

Mode: follower

dubbo admin 安装（web管理工具）

由于dubbo官网已经打不开了，这里是我的云盘 共享

http://pan.baidu.com/s/1pJ7o9PT

官网给出的 zk安装

官网给出的 dubbo-admin安装

1.下载dubbo-admin-2.5.4.war包，放在tomcat/webapps下

更改dubbo.properties 文件

vi ../webapps/dubbo-admin-2.5.4/WEB-INF/dubbo.propertiesdubbo.registry.aaaddress=zookeeper://127.0.0.1:2183 dubbo.admin.root.password=root dubbo.admin.guest.password=guest

随意更改之前配置过的端口号；

dubbo Provider Consumer 示例

即官网 首页示例

Provider:接口

package com.fpx.dubbo;

public interface DemoService {

	public void sayHello();
}

Provider:实现

package com.fpx.dubbo;

public class DemoServiceImpl implements DemoService {
	
	public void sayHello() {
		System.out.println("hello 00!");
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
	xsi:schemaLocation="http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd  
        http://code.alibabatech.com/schema/dubbo  
        http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
	<dubbo:application name="hello-world-app" />
	<dubbo:registry protocol="zookeeper" address="zookeeper://172.16.30.206:2183?backup=172.16.30.206:2182,172.16.30.206:2184" />
	<dubbo:protocol name="dubbo" port="20880" />
	<dubbo:service interface="com.fpx.dubbo.DemoService" ref="demoService" />       <!-- 和本地bean一样实现服务 -->
	<bean id="demoService" class="com.fpx.dubbo.DemoServiceImpl" />
</beans>

package com.fpx.dubbo;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class DubboProviderDemo {
	public static void main(String[] args) throws InterruptedException {
	    new ClassPathXmlApplicationContext(new String[]{"provider.xml" });
		while (true) {
		}
	}
}

Consumer配置文件

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"  
       xsi:schemaLocation="http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd  
        http://code.alibabatech.com/schema/dubbo  
        http://code.alibabatech.com/schema/dubbo/dubbo.xsd  
        ">  
    <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->  
    <dubbo:application name="consumer-of-helloworld-app" />       <!-- 使用multicast广播注册中心暴露发现服务地址 -->  
    <dubbo:registry  protocol="zookeeper" address="zookeeper://172.16.30.206:2183?backup=172.16.30.206:2182,172.16.30.206:2184" />         <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->  
    <dubbo:reference id="demoService" interface="com.fpx.dubbo.DemoService"/>  
</beans>

Consumer启动类

package com.fpx.dubbo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DubboComsumeDemo {  
    public static void main(String[] args) throws InterruptedException {  
        ApplicationContext factory = new ClassPathXmlApplicationContext(  
                new String[] {"comsumer.xml"});  
        DemoService demoService =(DemoService)factory.getBean("demoService");
        demoService.sayHello();  
    }  
}

先启动Provider，再启动Consumer

碰到的问题：

[INFO ] 11:48:16 (ClientCnxn.java:975) - Opening socket connection to server 172.16.30.206/172.16.30.206:2182. Will not attempt to authenticate using SASL (unknown error)
[INFO ] 11:48:26 (ClientCnxn.java:1096) - Client session timed out, have not heard from server in 10001ms for sessionid 0x0, closing socket connection and attempting reconnect
[DEBUG] 11:48:26 (ClientCnxnSocketNIO.java:203) - Ignoring exception during shutdown input
java.net.SocketException: Socket is not connected
	at sun.nio.ch.Net.translateToSocketException(Net.java:149)
	at sun.nio.ch.Net.translateException(Net.java:183)
	at sun.nio.ch.Net.translateException(Net.java:189)
	at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:428)
	at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:200)
	at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1185)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1110)
Caused by: java.nio.channels.NotYetConnectedException
	at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:800)
	at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:426)
	... 3 more
[DEBUG] 11:48:26 (ClientCnxnSocketNIO.java:210) - Ignoring exception during shutdown output

启动服务时报连接失败，检查后原来是我ubuntu防火墙问题；

解决方法:

vi /etc/sysconfig/iptables

增加端口信息:

-A INPUT -m state --state NEW -m tcp -p tcp --dport 2182 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2183 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2184 -j ACCEPT

service iptables restart

重新启动Provider，再启动Consumer就好啦!

dubbo+zookeeper集群

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原文地址：http://my.oschina.net/stonezing/blog/502834