Application registers in Eureka using IP instead of hostname when its Docker container publishes port

Question

I dockerize my Spring Boot application and deploy to Docker Swarm.

If I do not publish the port my app exposes, then Eureka client sends the hostname as an address of the instance, like http://ecf28bdd26c5:8080 - good

If I publish the port (using Docker's --publish parameter), then it registers with IP, like http://10.255.0.25:8080 - bad

It does so even if I explicitly set eureka.instance.prefer-ip-address=false.

How can I force Eureka client to really use hostname?

Answer 1

by explicitly setting the hostname eureka.instance.hostname=${SOME_VAR} or ignoring certain interfaces:

From the documentation: The following configuration will ignore the "docker0" interface and all interfaces that start with "veth".

application.yml
spring:
  cloud:
    inetutils:
      ignoredInterfaces:
        - docker0
        - veth.*

You can also force to use only specified network addresses using list of regular expressions:

application.yml
spring:
  cloud:
    inetutils:
      preferredNetworks:
        - 192.168
        - 10.0