Spring Cloud Netflix Eureka Client Configuration

Spring Cloud Netflix Eureka Client is a service discovery component that enables microservices to discover each other’s locations. It provides a platform-as-a-service (PaaS) approach to microservices architecture, making it easy to scale and manage distributed systems.
In this article, we will explore the configuration of Eureka client in Spring Cloud Netflix. We will cover the various properties that can be customized and the impact of each property on the Eureka client’s behavior.

1. Application Properties
   Eureka client configuration is done by providing application.properties or application.yml file in the classpath. These files contain key-value pairs that configure the Eureka client’s behavior.
   Here are some of the important properties that can be customized:
   1.1. eureka.client.register-with-eureka=true/false
   This property determines whether the Eureka client should register itself with the Eureka server. If set to true, the Eureka client will register itself with the Eureka server and become visible to other microservices. If set to false, the Eureka client will not register itself and can still discover other microservices through the Eureka server.
   1.2. eureka.client.fetch-registry=true/false
   This property determines whether the Eureka client should fetch the registry information from the Eureka server when it starts up. If set to true, the Eureka client will fetch the latest registry information from the Eureka server and update its local cache. If set to false, the Eureka client will use its local cache to discover other microservices.
   1.3. eureka.client.registry-fetch-interval-seconds=int
   This property sets the interval in seconds at which the Eureka client should fetch registry information from the Eureka server. It defaults to 30 seconds. If set to a higher value, it can reduce the load on the Eureka server but may result in stale registry information.
   1.4. eureka.client.service-url=http://eureka-server:port/eureka/
   This property sets the base URL of the Eureka server that the Eureka client should communicate with. Make sure to replace ‘eureka-server’ with the actual hostname or IP address of your Eureka server and ‘port’ with the actual port number on which your Eureka server is running.
   1.5. eureka.client.eurekaserver.name=my-eureka-server
   This property sets the name of the Eureka server instance that the Eureka client should register with. It defaults to the value returned by InetAddress.getLocalHost().getHostName(). Set this property if you have multiple instances of Eureka server running on different hosts or ports.
2. Customizing Client Behavior Through Code
   In addition to configuration files, you can also customize Eureka client behavior through code by creating a custom EurekaClientConfig bean in your Spring Boot application.