k8s容器内部应用向eruaka注册ip问题
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springboot项目部署到k8s中，发现eruaka注册是容器id，这个其他应用是无法访问的
参考,现在pom.xml中添加： org.springframework.cloud spring-cloud-commons
接着使用${spring.cloud.client.ip-address}
eureka: instance: instance-id: ${ spring.cloud.client.ip-address}: preferIpAddress: true statusPageUrlPath: /actuator/info healthCheckUrlPath: /actuator/health client: service-url: defaultZone: http://192.168.5.207:8761/eureka/,http://192.168.5.180:8761/eureka/,http://192.168.5.154:8761/eureka/ 确实替换为id了，但是确实容器IP，并不是主机IP，外部还是无法访问.
在k8s中设置spring.cloud.client.ip-address和k8s.port的环境变量， 
在eruaka中看似是对的，点击链接打开的还是http://179.20.3.178:9010/actuator/info，依旧是容器ip和端口， 
然而使用使用主机的IP和端口却可以访问. 
这两者之前的不一致问题，怎么解决呢？如果了解k8s的网络模式，，解决办法就知道了。设置hostNetwork: true问题就解决了。就不用什么instance-id
再看eruaka，就可以正常访问了 
使用hostNetwork有弊端，会出现端口占用，故这里推荐使用下图的方式，使用EUREKA_INSTANCE_IP-ADDRESS环境变量即可，处理方式跟一致 
当系统部署到生产环境，这里还有个dns的问题，你会发现docker内部无法访问域名 dnsConfig: nameservers: - 223.5.5.5```
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