注册Eureka识别到的是host不是IP的问题

一 出现的异常如下：

2020-08-17 09:49:53.459 ERROR 67476 --- [ctor-http-nio-4] a.w.r.e.AbstractErrorWebExceptionHandler : [e658f1f7-1]  500 Server Error for HTTP GET "/auth/v1/uaa/getValidCode"

java.net.UnknownHostException: izf2g068jp3uu6n0lhekc3z: nodename nor servname provided, or not known
	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_211]
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
	|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ HTTP GET "/auth/v1/uaa/getValidCode" [ExceptionHandlingWebHandler]
Stack trace:
		at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_211]

二 分析出现的异常

查看Eureka发现显示是没错，但是真正用的是host

而 host不能被识别，导致报错

三 解决

增加配置eureka.instance.prefer-ip-address=true 如下：

eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
  client:
    register-with-eureka: true
    fetch-registry: true
    serviceUrl:
      defaultZone: ${discovery_urls:http://10.0.43.243:1111/eureka/,http://10.0.43.244:1111/eureka/}