eurekainstanceprefer-ip-address=true

The configuration parameter "eureka.instance.prefer-ip-address" is used to specify whether the Eureka client should prefer using the IP address of the instance instead of the hostname when registering with the Eureka server.

When set to "true", the Eureka client will use the IP address of the instance for registration and for service discovery. This can be useful in certain scenarios where the hostname resolution may not be reliable or when using IP-based load balancing.

However, it is important to note that using IP addresses instead of hostnames can make the deployment less flexible, as IP addresses may change more frequently. Therefore, it is recommended to use hostnames whenever possible.

To enable this configuration, you would need to set the value of "eureka.instance.prefer-ip-address" to "true" in your Eureka client configuration file.