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Components of Microservices

Sep 19, 2019 • Kumar Pallav

Let us look at components of Microservices , which we will be learning, We will be creating

Below is the diagram of the components we will be building.

SpringBootMicroservicesComponents

Microservices : user-service and todo-services.
Config Server: All Microservices on startup will refer to config server for their configurations.
Api Gateway: A centralized way to access all the microservices , A front facing unit for all the clients. Also responsible for common services via Filters viz. Authentication , capturing user info in log before hitting services and many other.
Feign Client Helps to remove boilerplate restTemplate code
Ribbon Along with feign client helps to load balance the application
Naming Server: Eureka: All of the microservices on startup will let naming server know about their existence. Naming server will know their address /location/ ip . Whenever one microservices calls another via ribbon/feign , it will check naming server for existence on another service and return correct one. Because there can be multiple instances of any microservice it helps as in load balancing .
Spring Cloud Sleuth As the name suggests ,sleuth is a detective, To every incoming request it adds tracing mechanism , i.e. traceid . With all logs printing this trace id. We can track over which microservice instance request has traveled.
Rabbit MQ Just to keep track of all traces coming of incoming request. It keeps all these traces at one centralized place.
Zipkin UI for looking tracing the entire journey of request.
Hystrix A fallback mechanism for any failing services.

Note: All of the above Microservices are created as a part of tutorial , You can find entire tutorial at Spring Boot REST API and Microservices .

The source code of the above microservice architecture is present at Github.