dubbo

参考说明
https://promotion.aliyun.com/ntms/act/edasdubbo.html?utm_content=se_1005011324              #阿里云微服务
https://help.aliyun.com/document_detail/99299.html?spm=5176.261987.1367952.1.6f112f4doomrxR #阿里云dubbo简介

ZooKeeper 具有以下两大特性。

客户端如果对 ZooKeeper 的一个数据节点注册 Watcher 监听，那么当该数据节点的内容或是其子节点列表发生变更时，ZooKeeper 服务器就会向订阅的客户端发送变更通知。

对在 ZooKeeper 上创建的临时节点，一旦客户端与服务器之间的会话失效，那么该临时节点也就被自动清除。

Watcher（事件监听器），是 Zookeeper 中的一个很重要的特性。Zookeeper 允许用户在指定节点上注册一些 Watcher，并且在一些特定事件触发的时候，

ZooKeeper 服务端会将事件通知到感兴趣的客户端上去，该机制是 Zookeeper实现分布式协调服务的重要特性。

 

0 生产者启动

1 生产者注册至 zookeeper

2 消费者启动并订阅频道

3 zookeeper 通知消费者事件

4 消费者调用生产者

5 监控中心负责统计和监控服务状态

 

dubbo群集安装

1.安装zookeeper.参考地址：https://www.cnblogs.com/Yuanbangchen/p/17056168.html

2：生产者示例：(两台dubbo-provider)
[root@localhost7h local]# tar xvf dubbo-demo-provider-2.1.5-assembly.tar.gz  
[root@localhost7h local]# cd dubbo-demo-provider-2.1.5/

[root@localhost7h dubbo-demo-provider-2.1.5]# cat  conf/dubbo.properties
dubbo.container=log4j,spring
dubbo.application.name=demo-provider
dubbo.application.owner=
#dubbo.registry.address=multicast://224.5.6.7:1234
dubbo.registry.address=zookeeper://192.168.80.170:2181 | zookeeper://192.168.80.180:2181 | zookeeper://192.168.80.190:2181 #zk 集群配置
#dubbo.registry.address=zookeeper://127.0.0.1:2181  #单 zk 节点配置
#dubbo.registry.address=redis://127.0.0.1:6379
#dubbo.registry.address=dubbo://127.0.0.1:9090
dubbo.monitor.protocol=registry
dubbo.protocol.name=dubbo   
dubbo.protocol.port=20880  #端口
dubbo.log4j.file=logs/dubbo-demo-provider.log
dubbo.log4j.level=WARN


#启动 provider
 [root@localhost7h local]#./bin/start.sh 
Starting the demo-provider ....


[root@localhost7h tomcat]# netstat -antlp | grep 20880
tcp        0      0 0.0.0.0:20880           0.0.0.0:*               LISTEN      41046/java   

验证 provider 日志：(两台dubbo-provider)
[root@localhost7I kafka]# tail -f  dubbo-demo-provider-2.1.5/logs/stdout.log 
[16:35:03] Hello world2175, request from consumer: /192.168.80.190:34306
[16:35:07] Hello world2177, request from consumer: /192.168.80.190:34306
[16:35:11] Hello world2179, request from consumer: /192.168.80.190:34306
[16:35:15] Hello world2181, request from consumer: /192.168.80.190:34306
[16:35:20] Hello world2183, request from consumer: /192.168.80.190:34306
[16:35:24] Hello world2185, request from consumer: /192.168.80.190:34306




3：消费者示例：
[root@localhost7J local]# tar xvf dubbo-demo-consumer-2.1.5-assembly.tar.gz 
[root@localhost7J local]# cd dubbo-demo-consumer-2.1.5/

[root@localhost7J dubbo-demo-consumer-2.1.5]# cat  conf/dubbo.properties 
dubbo.container=log4j,spring
dubbo.application.name=demo-consumer
dubbo.application.owner=
#dubbo.registry.address=multicast://224.5.6.7:1234
dubbo.registry.address=zookeeper://192.168.80.170:2181 | zookeeper://192.168.80.180:2181 | zookeeper://192.168.80.190:2181
#dubbo.registry.address=zookeeper://127.0.0.1:2181
#dubbo.registry.address=redis://127.0.0.1:6379
#dubbo.registry.address=dubbo://127.0.0.1:9090
dubbo.monitor.protocol=registry
dubbo.log4j.file=logs/dubbo-demo-consumer.log
dubbo.log4j.level=WARN



#启动consumer
[root@localhost7J local]# ./bin/start.sh 
Starting the demo-consumer ....OK!
PID: 25137
STDOUT: logs/stdout.log

验证 consumer 日志：
[root@localhost7J logs]# tail -f stdout.log 
[16:35:03] Hello world2175, response form provider: 192.168.80.180:20880
[16:35:05] Hello world2176, response form provider: 192.168.80.170:20880
[16:35:07] Hello world2177, response form provider: 192.168.80.180:20880
[16:35:09] Hello world2178, response form provider: 192.168.80.170:20880
[16:35:11] Hello world2179, response form provider: 192.168.80.180:20880
[16:35:13] Hello world2180, response form provider: 192.168.80.170:20880
[16:35:15] Hello world2181, response form provider: 192.168.80.180:20880
[16:35:18] Hello world2182, response form provider: 192.168.80.170:20880
[16:35:20] Hello world2183, response form provider: 192.168.80.180:20880


4.zoolnspector工具验证

5.部署dubbo admin管理工具:基于zookeeper发现并管理 provider和 consumer。
5.1安装tomcat
[root@localhost7h local]# tar xvf apache-tomcat-8.5.69.tar.gz
[root@localhost7h local]# ln -sv apache-tomcat-8.5.69 tomcat  
[root@localhost7h local]# cd tomcat/webapps/

5.2解压项目
[root@localhost7h webapps]# unzip  dubboadmin.war 
[root@localhost7h webapps]# ls
docs  dubboadmin  examples  host-manager  manager  ROOT

5.3修改项目配置文件
[root@localhost7h webapps]# cat  dubboadmin/WEB-INF/dubbo.properties 
#dubbo.registry.address=zookeeper://192.168.80.170:2181 | zookeeper://192.168.80.180:2181 | zookeeper://192.168.80.190:2181
dubbo.registry.address=zookeeper://192.168.80.170:2181 
dubbo.admin.root.password=root
dubbo.admin.guest.password=guest

5.4 验证 dubbo admin 界面：
http://192.168.80.170:8080/dubboadmin