What does Spring Cloud Netflix Eureka do?

Eureka is a framework for service discovery and registration in Spring Cloud Netflix. Its specific functions include: allowing services to register with Eureka through the REST API; allowing clients to discover registered services through Eureka; Eureka will regularly send heartbeats to registered services , and delete unhealthy or unresponsive services from the registry; Eureka provides the client with a service list and can perform balanced distribution according to the configured load balancing policy.

Spring Cloud Netflix Eureka: Service Discovery and Registration

Introduction

Spring Cloud Netflix Eureka is a service discovery and registration framework in a microservice architecture. It is based on Netflix's Eureka service and provides dynamic service discovery, load balancing and fault tolerance.

Function

The main functions of Eureka are as follows:

• Service registration: Allows services to register with Eureka through REST API Register themselves.
• Service Discovery: Allows clients to discover registered services through Eureka.
• Health check: Eureka will periodically send heartbeats to registered services and delete unhealthy or unresponsive services from the registry.
• Load balancing: Eureka provides a service list for clients and can perform balanced distribution according to the configured load balancing policy.

Practical case

1. Service registration

In Spring Boot application, you can use@EnableEurekaClient Annotation to enable Eureka service registration:

@SpringBootApplication
@EnableEurekaClient
public class MyApplication {
    // ...
}

2. Service discovery

Eureka will run on port 8761 by default. Client applications can use the @LoadBalanced annotation to apply load balancing policies to the injected RestTemplate:

@RestController
public class MyController {
    @Autowired
    @LoadBalanced
    private RestTemplate restTemplate;
    
    @GetMapping("/")
    public String index() {
        String result = restTemplate.getForObject("http://my-service/", String.class);
        // ...
        return result;
    }
}

3. Health Check

Eureka Pre- The device will send a heartbeat to the registration service every 30 seconds. You can customize the health check path by setting the property eureka.instance.healthCheckUrlPath in application.properties:

eureka.instance.healthCheckUrlPath=/health

Conclusion

Spring Cloud Netflix Eureka is a powerful and easy-to-use framework for service discovery and registration. It provides dynamic service discovery, load balancing, and fault tolerance capabilities, thereby simplifying the development and maintenance of microservice architectures.

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