spec: hostname: my-app subdomain: default-subdomain hostAliases: - ip: "127.0.0.1" hostnames: - "my-app" The "cannot determine local hostname" error is rarely a critical failure—your app will still start. But in distributed systems, relying on localhost for service registration, logging, or link generation will break cross-service communication.
# 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: relying on localhost for service registration
spring.cloud.inetutils.preferred-networks[0]=192.168.0.0/24 Sometimes you need to tell Spring Cloud what not to pick: relying on localhost for service registration
spring: cloud: inetutils: default-hostname: my-service-01 Or via JVM argument: relying on localhost for service registration