O.s.cloud.commons.util.inetutils Cannot Determine Local Hostname -

# application.yml spring: cloud: inetutils: preferred-networks: - 192.168.0.0/24 # Your local LAN range - 10.0.0.0/8 # Or Docker's default range Or via properties:

spring.cloud.inetutils.preferred-networks[0]=192.168.0.0/24 Sometimes you need to tell Spring Cloud what not to pick: # application

spring: cloud: inetutils: default-hostname: my-service-01 Or via JVM argument: particularly in Docker

spring: cloud: inetutils: ignored-interfaces: - docker0 - veth.* - utun.* # For macOS VPN interfaces When you don't care about dynamic resolution and just want the error gone: or custom network environments

If you’ve ever worked with Spring Cloud, particularly in Docker, Kubernetes, or custom network environments, you might have stumbled upon this frustrating warning or error during application startup:

o.s.cloud.commons.util.InetUtils: Cannot determine local hostname At first glance, it seems like a minor issue, but it can lead to serious problems: services failing to register with Eureka, incorrect links in Spring Cloud Gateway, or distributed tracing breaking because the hostname value defaults to localhost .

services: my-app: hostname: my-app extra_hosts: - "my-app:127.0.0.1" Define a hostAliases or ensure your pod spec sets a proper hostname: