Learn to implement microservices across a range of common tech stacks.

Scalability & System Design for Developers

In this module, we’ll look at some fundamental concepts for implementing microservices. Within each concept, learn about the different technologies used to implement it. The technologies include front-end integration with Edge Side Includes (ESI), asynchronous microservices with Kafka and REST feeds, synchronous microservices with the Netflix stack, and Consul, Docker, Kubernetes, Cloud Foundry. Each technology is described and then demonstrated with real code.

Microservice Architecture: Practical Implementation

SCSs stand out from deployment monoliths in the same way as microservices. A deployment monolith would implement the entire
application in a single deployable artifact while **SCSs divide the system into several independent web applications**.

Because an SCS is a separate web application, it can be deployed
independently of the other SCSs. SCSs are also modules of an overall
system. Therefore, **SCSs are independently deployable modules** and consequently correspond to the definition of microservices.
 

# One SCS can be split into several microservices 

However, an SCS may be split into several microservices. If the payment in the *check out* SCS of an e-commerce system causes a
particularly high load, then it can be implemented as a separate microservice which can be **scaled separately** from the rest of the
*check out* SCS. So, the *check out* SCS consists of a microservice for
payment and contains the rest of the functionality in another
microservice.

Another reason for separating a microservice from an SCS is the
**security advantage offered by greater isolation**. Additionally, domain services that calculate the price of a product or quotation for all SCSs can be a useful shared microservice. The microservice
should be assigned to a team like an SCS in order to avoid too much
coordination.



In this lesson, we'll study the relationship between SCSs and microservices.

SCSs and Microservices