Eureka health Check By default, Eureka uses the client heartbeat to determine whether the client is started. Unless otherwise specified, the discovery client will not propagate the current health check status of the application against the Spring Boot executor. This means that Eureka will always declare the application “UP” after successful registration. This behavior can be changed by enabling Eureka health checking to propagate application state to Eureka. Therefore, every other application will not send traffic to the application in a state other than “UP”.

application.yml eureka: client: healthcheck: enabled: True warning eureka. Client. Healthcheck. Enabled = true only in the application. The yml in Settings. Setting the value in bootstrap.yml will cause undesirable side effects, such as registering in eureka with UNKNOWN state. If you need more to control health check, you can consider to implement their own com.net flix. Appinfo. HealthCheckHandler.

Eureka instance and client metadata it’s worth spending some time understanding how Eureka metadata works so that you can use it on your platform. There is standard metadata such as host name, IP address, port number, status page, and health check. These publications are in the service registry and are used by customers to contact services in a direct way. Additional metadata can be added to the eureka. The instance. The instance metadataMap registered, and it will be accessible in the remote client, but generally will not change the client’s behavior, unless to realize the meaning of metadata. Several special cases are described below, where Spring Cloud has specified meanings for metadata mappings.

Using Eureka Cloudfoundry on Cloudfoundry has a global router, so all instances of the same application have the same host name (as in other PaaS solutions with similar architectures). This is not necessarily a barrier to using Eureka, but if you use a router (recommended, or even mandatory, depending on how your platform is set up), you need to explicitly set the hostname and port number (secure or not) so that they can use the router. You might also want to use instance metadata so that you can distinguish between instances on the client side (for example, in a custom load balancer). By default, eureka. Instance. InstanceId as vcap. Application. Instance_id. Such as:

application.yml eureka: instance: hostname: ${vcap.application.uris[0]} nonSecurePort: 80 Depending on how the security rules are set up in the Cloudfoundry instance, you can register and use the IP address of the host VM to make direct service-to-service calls. This feature is not yet available on Pivotal Web Services (PWS).

If the application plans to deploy to the AWS cloud, then the Eureka instance must be configured for AWS awareness. This can be done by customising EurekaInstanceConfigBean as follows:

@Bean @Profile(“! default”) public EurekaInstanceConfigBean eurekaInstanceConfig(InetUtils inetUtils) { EurekaInstanceConfigBean b = new EurekaInstanceConfigBean(inetUtils); AmazonInfo info = AmazonInfo.Builder.newBuilder().autoBuild(“eureka”); b.setDataCenterInfo(info); return b; } Change Eureka instance ID Vanilla Netflix Eureka instance registered with the same ID as its host name (i.e. only one service per host). Spring Cloud Eureka provides a sensible default like this:{spring.application.name}:{server port}}} instead! For example myhost: myappname: 8080.

Using Spring Cloud, and you can use in eureka. The instance. The instanceId in provide a unique identifier to override it. Such as:

application.yml eureka: instance: instanceId: {vcap.application.instance_id:{random.value}}} uses this metadata and multiple service instances deployed on localhost, where the random value will be performed so that the instance is unique. In Cloudfoundry vcap. Application. Instance_id in Spring Boot automatically fill in the application, so there is no need to random values.