dubbo 设置注册到注册中心的IP地址为公网IP

ゝ一世哀愁。 2021-09-25 12:20 621阅读 0赞

### 目录 ###

*   *  场景
     *  测试
     *  解决

## 场景 ##

某些情况下（例如公共测试环境 xx云上ECS 部署了dubbo提供者），  
我们需要将dubbo提供者应用 注册到注册中心的地址为公网ip地址。

这样方便公司内网或者其他云上应用调用该dubbo提供者的接口服务。

## 测试 ##

**dubbo 版本 2.7.8**

查看 dubbo [官方文档][Link 1]，一开始以为 修改属性 dubbo.protocol.host

# 服务提供者协议配置。对应的配置类： org.apache.dubbo.config.ProtocolConfig。
     # 同时，如果需要支持多协议，可以声明多个 <dubbo:protocol> 标签，并在 <dubbo:service> 中通过 protocol 属性指定使用的协议。
     protocol:
       name: dubbo
       port: 20207
       host:  8.17.29.89

上面的 8.17.29.89 是 xx云 ECS 绑定的 弹性公网ip ， 然而启动报错：

org.apache.dubbo.rpc.RpcException: Fail to start server(url: dubbo://8.17.29.89:20207/com.middol.zentao.rpc.jar.ZenTaoAggregationService?anyhost=false&application=zentao-rpc-api&bind.ip=192.168.6.51&bind.port=20207&channel.readonly.sent=true&codec=dubbo&deprecated=false&document=%E7%A6%85%E9%81%93rpc%E6%8E%A5%E5%8F%A3&dubbo=2.0.2&dynamic=true&generic=false&heartbeat=60000&interface=com.middol.zentao.rpc.jar.ZenTaoAggregationService&logger=slf4j&metadata-type=remote&methods=taskInfoList,getById,getUser,bugInfoList,getZenTaoEmployeesLogs,getProductStatistics,getPersonStatistics&pid=21676&qos.accept.foreign.ip=false&qos.enable=true&qos.port=33307&release=2.7.8&revision=1.0-SNAPSHOT&side=provider&timestamp=1627035267274&version=1.0) Failed to bind NettyServer on /192.168.6.51:20207, cause: Cannot assign requested address: bind
    	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:348) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.openServer(DubboProtocol.java:320) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.export(DubboProtocol.java:303) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:64) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:155) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:66) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.registry.integration.RegistryProtocol.lambda$doLocalExport$2(RegistryProtocol.java:255) ~[dubbo-2.7.8.jar:2.7.8]
    	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_151]
    	at org.apache.dubbo.registry.integration.RegistryProtocol.doLocalExport(RegistryProtocol.java:253) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:205) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:62) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:153) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:64) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:492) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:325) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:300) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:206) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.bootstrap.DubboBootstrap.lambda$exportServices$15(DubboBootstrap.java:1103) ~[dubbo-2.7.8.jar:2.7.8]
    	at java.util.HashMap$Values.forEach(HashMap.java:981) ~[na:1.8.0_151]
    	at org.apache.dubbo.config.bootstrap.DubboBootstrap.exportServices(DubboBootstrap.java:1090) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:901) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onContextRefreshedEvent(DubboBootstrapApplicationListener.java:59) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onApplicationContextEvent(DubboBootstrapApplicationListener.java:52) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
    	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.8.RELEASE.jar:2.3.8.RELEASE]
    	at com.middol.zentao.rpc.Application.main(Application.java:37) [classes/:na]
    Caused by: org.apache.dubbo.remoting.RemotingException: Failed to bind NettyServer on /192.168.6.51:20207, cause: Cannot assign requested address: bind
    	at org.apache.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:77) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.transport.netty4.NettyServer.<init>(NettyServer.java:77) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.transport.netty4.NettyTransporter.bind(NettyTransporter.java:35) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.Transporter$Adaptive.bind(Transporter$Adaptive.java) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.Transporters.bind(Transporters.java:56) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchanger.bind(HeaderExchanger.java:44) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.remoting.exchange.Exchangers.bind(Exchangers.java:70) ~[dubbo-2.7.8.jar:2.7.8]
    	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:346) ~[dubbo-2.7.8.jar:2.7.8]
    	... 40 common frames omitted
    Caused by: java.net.BindException: Cannot assign requested address: bind
    	at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_151]

查看官方文档，debug 源码，知道 host的含义：

在 Dubbo 中， Provider 启动时主要做两个事情，  
一是启动 server  
二是向注册中心注册服务。  
启动 server 时需要绑定 socket，  
向注册中心注册服务时也需要发送 socket 唯一标识服务地址

报错无法启动 server Cannot assign requested address: bind， 其实是socket无法启动，socket端口外网无法连接， 理由是 如果服务端套接字绑定在它上面，你的客户端程序就只能在本机访问。

这里面 暂不讨论源码，总之配置文件中 （dubbo.protocol 或 dubbo.provider 的 host）的host属性，如果要配置 必须配置本机的ip （内网ip 或者 127.0.0.1 或者 不配dubbo自己获取）

## 解决 ##

网上 或者 文档中有几个方法，修改hosts之类的， 我个人解决方法推荐：

设置 java **系统参数（ -Dxxx=value）** \-DDUBBO\_IP\_TO\_REGISTRY=“8.17.29.89”  
如果是 springboot 可以这样：

java -jar  myDubboRpc-api.jar  -DDUBBO_IP_TO_REGISTRY="8.17.29.89"

当然 也可以事先 将 DUBBO\_IP\_TO\_REGISTRY 这个参数设置到系统环境变量里面。

如果是docker 方式，请参考 ： [https://github.com/apache/dubbo-samples/tree/master/dubbo-samples-docker][https_github.com_apache_dubbo-samples_tree_master_dubbo-samples-docker]

其实就是docker 启动时候指定环境变量 -e DUBBO\_IP\_TO\_REGISTRY = “8.17.29.89”

[Link 1]: https://dubbo.apache.org/zh/docs/v2.7/user/examples/set-host/
[https_github.com_apache_dubbo-samples_tree_master_dubbo-samples-docker]: https://github.com/apache/dubbo-samples/tree/master/dubbo-samples-docker