Feign + Eureka: UnknownHostException when Attempting to Invoke a Service

Choon-Chern Lim Spring Boot, Spring Cloud Netflix Eureka, Spring Cloud Netflix Ribbon, Spring Cloud Open Feign April 30, 2019 1 Minute

PROBLEM

When attempting use Feign to invoke a service through Eureka, the following exception occurs:-

MY-HOST-NAME executing GET http://donkey-kong-service/throw/barrels/10
feign.RetryableException: MY-HOST-NAME executing GET http://donkey-kong-service/throw/barrels/10
	at feign.FeignException.errorExecuting(FeignException.java:84)
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:113)
	...
Caused by: java.net.UnknownHostException: MY-HOST-NAME
		at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)

SOLUTION

Go to the donkey-kong-service app and add the following line to the application.properties:-

eureka.instance.prefer-ip-address=true

Now, when Feign tries to invoke the service, the IP address will be used instead of the OS’ reported hostname.

Published April 30, 2019

One thought on “Feign + Eureka: UnknownHostException when Attempting to Invoke a Service”

dsagy says:

May 31, 2020 at 3:10 PM

Feign is not able to resolve service name with IP address. E.g Feign trying to request http://registrationServices/api/registration-services/registrationId , where registrationServices is service registered with Eureka and name of Fiegn client .

I have also set eureka.instance.preferIpAddress=true in registration services and its reflecting in Eureka , but somehow Fiegn is not able to resolve it.

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