dubbo+zookeeper集群

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

1.解压下载好的zookeeper，到服务器上，解压并重命名

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.

3.进入 conf/zoo.cfg 里指定的 data 文件夹，新建
myid
文件，用于标识此zk实例是集群中的哪一个,该数字必须和
zoo.cfg
文件中的
server.X
中的X相对应.

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

5.这时查看zk的进程，是否是预期的3个，以及状态（2个foller、1个leader）

[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；

启动tomcat，访问http://ip:8080/dubbo-admin-2.5.4/，输入默认的用户名root密码:root

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!");
}
}

P

rovider 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"> <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>

P

rovider启动类

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

控制台也输出了"hello 00!";

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

重启防火墙

service iptables restart

重新启动Provider，再启动Consumer就好啦!