Nacos中注册IP的选择

本文主要是介绍Nacos中注册IP的选择，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

在启动微服务的时候因为电脑中的网卡(虚拟网卡VPN等等)太多导致注册nacos中注册的IP地址是错误的:
可以使用如下配置注册你想注册的网卡

spring:
  cloud:
    inetutils:
      preferredNetworks:
      - 10.10

一下为关键代码: org.springframework.cloud.commons.util.InetUtils中的

    public InetAddress findFirstNonLoopbackAddress() {
        InetAddress result = null;

        try {
            int lowest = 2147483647;
            Enumeration nics = NetworkInterface.getNetworkInterfaces();

            label61:
            while(true) {
                NetworkInterface ifc;
                do {
                    while(true) {
                        do {
                            if (!nics.hasMoreElements()) {
                                break label61;
                            }

                            ifc = (NetworkInterface)nics.nextElement();
                        } while(!ifc.isUp());

                        this.log.trace("Testing interface: " + ifc.getDisplayName());
                        if (ifc.getIndex() >= lowest && result != null) {
                            if (result != null) {
                                continue;
                            }
                            break;
                        }

                        lowest = ifc.getIndex();
                        break;
                    }
                } while(this.ignoreInterface(ifc.getDisplayName()));

                Enumeration addrs = ifc.getInetAddresses();

                while(addrs.hasMoreElements()) {
                    InetAddress address = (InetAddress)addrs.nextElement();
                    //重点是isPreferredAddress代码
                    if (address instanceof Inet4Address && !address.isLoopbackAddress() && this.isPreferredAddress(address)) {
                        this.log.trace("Found non-loopback interface: " + ifc.getDisplayName());
                        result = address;
                    }
                }
            }
        } catch (IOException var8) {
            this.log.error("Cannot get first non-loopback address", var8);
        }

        if (result != null) {
            return result;
        } else {
            try {
                return InetAddress.getLocalHost();
            } catch (UnknownHostException var7) {
                this.log.warn("Unable to retrieve localhost");
                return null;
            }
        }
    }
	//主要在这里看到有个配置属性控制的 preferredNetworks
    boolean isPreferredAddress(InetAddress address) {
        if (this.properties.isUseOnlySiteLocalInterfaces()) {
            boolean siteLocalAddress = address.isSiteLocalAddress();
            if (!siteLocalAddress) {
                this.log.trace("Ignoring address: " + address.getHostAddress());
            }

            return siteLocalAddress;
        } else {
            List<String> preferredNetworks = this.properties.getPreferredNetworks();
            if (preferredNetworks.isEmpty()) {
                return true;
            } else {
                Iterator var3 = preferredNetworks.iterator();

                String regex;
                String hostAddress;
                do {
                    if (!var3.hasNext()) {
                        this.log.trace("Ignoring address: " + address.getHostAddress());
                        return false;
                    }

                    regex = (String)var3.next();
                    hostAddress = address.getHostAddress();
                } while(!hostAddress.matches(regex) && !hostAddress.startsWith(regex));

                return true;
            }
        }
    }
//    配置文件定义如下:
    @ConfigurationProperties("spring.cloud.inetutils")
public class InetUtilsProperties {
    public static final String PREFIX = "spring.cloud.inetutils";
    private String defaultHostname = "localhost";
    private String defaultIpAddress = "127.0.0.1";
    @Value("${spring.util.timeout.sec:${SPRING_UTIL_TIMEOUT_SEC:1}}")
    private int timeoutSeconds = 1;
    private List<String> ignoredInterfaces = new ArrayList();
    private boolean useOnlySiteLocalInterfaces = false;
    private List<String> preferredNetworks = new ArrayList();
    ....

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