Eureka Server - list all registered instances

Question

I have a Spring Boot application that is also a Eureka Server. I want to list all instances that have been registered to this Eureka Server. How do I do it?

Answer 1

Fetch the registry using EurekaServerContextHolder.getInstance().getServerContext().getRegistry() then use the registry to list all Applications

PeerAwareInstanceRegistry registry = EurekaServerContextHolder.getInstance().getServerContext().getRegistry();
    Applications applications = registry.getApplications();

    applications.getRegisteredApplications().forEach((registeredApplication) -> {
        registeredApplication.getInstances().forEach((instance) -> {
            System.out.println(instance.getAppName() + " (" + instance.getInstanceId() + ") : " + response);
        });
    });

Answer 2

If you want to get all registered applications.

1. you need to turn on eureka's configuration.

   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/
       #register eureka as application
       register-with-eureka: true
       #fetch all thing, we can get applications here
       fetch-registry: true
       #also you can specify the instance renewal time.
     server:
       enable-self-preservation: false
   

2. now we can get the registered applications, but the class must be put in eureka application's package. [As we need to autowire PeerAwareInstanceRegistry]

@Autowired
PeerAwareInstanceRegistry registry;

public void eurekaApplications() {
    Applications applications = registry.getApplications();
    //TODO add your code here.
}