Spring Cloud Kubernetes Loadbalancer gives pod ip address instead of service url when spring.cloud.kubernetes.loadbalancer.mode=SERVICE

Problem I am trying to use Spring Boot with Spring Cloud Kubernetes to discovery services with the loadbalancer in SERVICE mode. I have followed the documentation from https://docs.spring.io/spring-cloud-kubernetes/docs/current/reference/html/index.html where it says to set spring.cloud.kubernetes.loadbalancer.mode=SERVICE and include the following dependency

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-kubernetes-fabric8-loadbalancer</artifactId>
</dependency>

In my sample project I have created two identical applications, app a and app b, both of which use the loadbalancer dependency and have loadbalancer set to SERVICE mode. After running my k8s.yaml file this is the output:

The last line of app a and app b logs show the ip address of the pod where I would have expected it to be something like service-a.default.svc.cluster.local as mentioned in the documentation. To get the address output I am calling System.out.println(discoveryClient.getInstances("service-b").get(0).getUri().toString()); for app a and System.out.println(discoveryClient.getInstances("service-a").get(0).getUri().toString()); for app b.

Any guidance would be greatly appreciated.

Sample https://github.com/pearsonradu/spring-cloud-kubernetes-loadbalancer-service-example

Versions:

• Docker Desktop: 3.1.0
• Kubernetes: 1.19.3
• Spring Boot: 2.4.5
• Spring Cloud: 2020.0.2

Includes

• app a
• app b
• k8s configuration

[pearsonradu]

Using the @Loadbalanced annotation seemed to do the trick! The request is successful with the annotation present and when it is removed the request fails. Enabling SERVICE mode points to the cluster address and switching to POD points to the IP address. Thank you for the clarification!

[pearsonradu]

Great, I appreciate the help. I will give that a shot and get back to you.