What is the difference between Eureka and Nacos?

Eureka and Nacos are two different service registration and discovery centers.

1. Functional differences: Eureka is an open-source service registration and discovery component from Netflix, mainly used for service registration and discovery in microservices architecture. It provides a centralized service registry, where service instances register their information such as IP address, port number, etc., so that other services can discover and call them. Nacos is an open-source service registration and discovery center from Alibaba, which not only provides service registration and discovery functionality but also offers service configuration management, dynamic configuration updates, service routing, and more. Nacos supports various registration methods, including DNS-based service registration, RESTful API registration, and custom RPC-based registration.

2. Ecosystem differences: Eureka is a Netflix open-source project closely integrated with other Netflix components like Ribbon and Hystrix, enabling seamless use together. Nacos is an Alibaba open-source project closely integrated with other Alibaba middleware like Dubbo and Spring Cloud Alibaba, making it easy to use together.

3. Functional feature differences: Eureka provides a self-preservation mechanism, where if the Eureka server loses a large number of service instances in a short period, it enters self-preservation mode and does not immediately remove these service instances, preventing accidental deletion due to network fluctuations or other issues. Nacos supports configuration management for multiple environments and namespaces, better meeting the needs of multi-tenant and multi-environment setups.

In conclusion, Eureka and Nacos have differences in functionality, ecosystem, and functional features, allowing users to choose the suitable service registration and discovery center based on their specific requirements.