How to Enable Nacos Service Discovery with Spring Boot Admin After Startup

Introduction

The author is rebuilding microservices in a new company, choosing Nacos as the service registry instead of Eureka, and using Mica as the microservice core. The source code is available at https://gitee.com/596392912/mica.

Problem

After integrating Nacos with Spring Boot Admin, only services started before the admin are monitored. Spring Boot Admin relies on HeartbeatEvent for new service registration. The author notes that Eureka and Consul clients also send this event.

Eureka

Consul

Solution

The author initially considered implementing the feature and submitting it upstream, but discovered that the official spring-cloud-alibaba repository already includes the functionality. Since it has not been released yet, the author copied the relevant code into their own project.

Copy NacosWatch

Note that there may be errors; you can hard‑code the required properties.

/**
 * watch delay,duration to pull new service from nacos server.
 */
private long watchDelay = 30000;

Add NacosWatch Auto‑Configuration

/**
 * NacosWatch auto‑configuration
 *
 * @author L.cm
 */
@Configuration
public class NacosWatchAutoConfiguration {

    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(value = "spring.cloud.nacos.discovery.watch.enabled", matchIfMissing = true)
    public NacosWatch nacosWatch(NacosDiscoveryProperties nacosDiscoveryProperties) {
        return new NacosWatch(nacosDiscoveryProperties);
    }
}

Restart Spring Boot Admin, then start the other services; the new services are automatically synchronized to Spring Boot Admin—success!