dubbo 2.7.14开始在docker swarm中注册到nacos中IP地址出现问题

[zhlking]

Environment

• docker swarm
• Dubbo version: 2.7.14
• Java version: 1.8
• [master] Simplify and unify local address getting method #8679 这个更新后开始出现问题的

docker swarm环境下从2.7.14版本开始获取的是本地虚拟网桥段的地址，获取的IP地址只能够在宿主机上访问，跨主机是不能访问的。2.7.14版本之前能获取到容器swarm网络的IP。

暂时解决办法，重写了org.apache.dubbo.common.utils.NetUtils类。
修改dubbo/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java 的428-444行，如下：

        if (result == null) { // If not found, try to get the first one
            for (NetworkInterface networkInterface : validNetworkInterfaces) {
                Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    Optional<InetAddress> addressOp = toValidAddress(addresses.nextElement());
                    if (addressOp.isPresent()) {
                        try {
                            if (addressOp.get().isReachable(100)) {
                                return networkInterface;
                            }
                        } catch (IOException e) {
                            // ignore
                        }
                    }
                }
            }
        }

改为：

        if (result == null) { // If not found, try to get the first one
            for (NetworkInterface networkInterface : validNetworkInterfaces) {
                Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    Optional<InetAddress> addressOp = toValidAddress(addresses.nextElement());
                    if (addressOp.isPresent()) {
                        try {
                            if (addressOp.get().isReachable(100)) {
                                result = networkInterface;
                                break;
                            }
                        } catch (IOException e) {
                            // ignore
                        }
                    }
                }
            }
        }

[FelixLiuSheng]

我今天在dubbo 3.0.5上也遇到了类似的问题，在docker host模式或者本机正常启动都可能存在ip地址获取不正确的问题,望在下一个版本中得到修复

[Alloyee]

一样的问题，目前通过扩展一个Registory和RegistoryFactory来解决的
`public class Nacos2Registry extends NacosRegistry {
public Nacos2Registry(URL url, NacosNamingServiceWrapper namingService) {
super(url, namingService);
}

@Override
public void register(URL url) {
    log.info("Nacos2Registry register before setting,url:{}",url);
    url = url.setHost(NetUtils.getIpAddress());
    log.info("Nacos2Registry register after setting,url:{}",url);
    super.register(url);
}

@Override
public void unregister(URL url) {
    log.info("Nacos2Registry unregister,url:{}",url);
    url = url.setHost(NetUtils.getIpAddress());
    super.unregister(url);
}

}`

[CrazyHZM]

I think we can extend the way to get the address to adapt to different scenarios.
@chickenlj Do you have any other ideas.