Example of Sidecar Application for Microservices

Question

Spring云配置服务器是否是微服务的补充应用示例？

Answer 1

Do you mean if the Spring Cloud Config Server itself is what the Spring Cloud documentation labels as Sidecar? Then no, as far as I know it is just a plain, regular Spring Boot app.

A Sidecar as referred to in Polyglot support with Sidecar is a Spring Boot application that acts as a bridge between your service infrastructure and a service that is not written in a JVM language. Apps written in Python, Go, Ruby, C#, NodeJS, Erlang or really any other language that can bind something to a port come to mind.

The benefits of the Sidecar are, that your Non-JVM apps

• service discovery become automatically discoverable through Eureka , which means that JVM services can resolve the host:port/<service-id> of the Non-JVM apps as well as the other way around,
• monitoring are monitorable through the same health-endpoints-infrastructure that is available in Spring Boot (Actuator), ie by manually providing the health endpoint in the Non-JVM app Eureka knows when the Non-JVM service is down
• routing/proxying query the services by either manually looking up their hosts/ports or proxying these requests through Zuul , which in turn resolves their current addresses through Eureka
• balancing be load balanced by Ribbon and
• configuration may consume configuration properties provided via Spring Cloud Config .

I hope this answer addresses your question, if not (or someone finds it to be inaccurate or misleading) just let me know and I delete it to make room for something more suitable. ;-)