dubbo生产者在同一台服务器上部署多个jar包时报端口冲突的问题

骑猪看日落 2021-05-12 11:55 602阅读 0赞

\#\#dubbo 生产者在同一台服务器上部署多个jar包时报端口冲突的问题

报错信息如下：

Caused by: com.alibaba.dubbo.remoting.RemotingException: Failed to bind NettyServer on /*.*.*.*:20880, cause: Failed to bind to: /0.0.0.0:20880
        at com.alibaba.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:73)
        at com.alibaba.dubbo.remoting.transport.netty.NettyServer.<init>(NettyServer.java:63)
        at com.alibaba.dubbo.remoting.transport.netty.NettyTransporter.bind(NettyTransporter.java:33)
        at com.alibaba.dubbo.remoting.Transporter$Adpative.bind(Transporter$Adpative.java)
        at com.alibaba.dubbo.remoting.Transporters.bind(Transporters.java:48)
        at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchanger.bind(HeaderExchanger.java:41)
        at com.alibaba.dubbo.remoting.exchange.Exchangers.bind(Exchangers.java:63)
        at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:329)
        ... 34 more
    Caused by: org.jboss.netty.channel.ChannelException: Failed to bind to: /0.0.0.0:20880
        at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
        at com.alibaba.dubbo.remoting.transport.netty.NettyServer.doOpen(NettyServer.java:94)
        at com.alibaba.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:68)
        ... 41 more
    Caused by: java.net.BindException: Address already in use: bind
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:437)
        at sun.nio.ch.Net.bind(Net.java:429)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
        at org.jboss.netty.channel.socket.nio.NioServerBoss$RegisterTask.run(NioServerBoss.java:193)
        at org.jboss.netty.channel.socket.nio.AbstractNioSelector.processTaskQueue(AbstractNioSelector.java:366)
        at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:290)
        at org.jboss.netty.channel.socket.nio.NioServerBoss.run(NioServerBoss.java:42)
        ... 3 more

方法一：此时将端口改为其它端口都不起作用，可以将生产者端的端口改为-1，使用随机端口，可以解决问题

dubbo:
      application:
        id: demo-provider
        name: demo-provider
      protocol:
        id: dubbo
        name: dubbo
        port: -1

方法二：使用如下方法，启动时获取随机端口

package com.ciming.util;
    
    import java.util.Map;
    import java.util.Map.Entry;
    
    import javax.annotation.PostConstruct;
    
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.context.ConfigurableApplicationContext;
    
    import com.alibaba.dubbo.common.utils.NetUtils;
    import com.alibaba.dubbo.config.ProtocolConfig;
    /**
     * 一个机器部署两个dubbo生产者服务会产生端口占用问题，为了解决这个问题，在加载dubbo配置文件之前，先设置没被占用的端口
     * @author typ
     */
    public class DynamicDubboPortReader implements ApplicationContextAware{
        @Autowired
        private ApplicationContext applicationContext;
        
        private int port = 20880;
        
        @PostConstruct
        public void init(){
            Map<String, ProtocolConfig> map = applicationContext.getBeansOfType(ProtocolConfig.class);
            for(Entry<String,ProtocolConfig> con: map.entrySet()){
                port = NetUtils.getAvailablePort();
                System.out.println("=========="+port);
                con.getValue().setPort(port);
            }
        }
        
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
            this.applicationContext = (ConfigurableApplicationContext)applicationContext;
        }
    
    }

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