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Architecture of Microservice-Based Systems
This chapter discusses how microservices should behave when viewed from the outside and how an entire microservice system can be developed. Chapter 8, “Integration and Communication,” covers possible communication technologies that are an important technology component. Chapter 9, “Architecture of Individual Microservices,” focuses on the architecture of individual microservices.
Section 7.1 describes what the domain architecture of a microservice system should look like. Section 7.2 presents appropriate tools to visualize and manage the architecture. Section 7.3 shows how the architecture can be adapted in a stepwise manner. Only a constant evolution of the software architecture will ensure that the system remains maintainable in the long run and can be developed further. Section 7.4 discusses the goals and approaches that are important to enable further development.
Next, a number of approaches for the architecture of a microservice-based system are explained. Section 7.6 discusses the special challenges that arise when a legacy application is to be enhanced or replaced by microservices. Section 7.8 introduces event-driven architecture. This approach makes possible architectures that are very loosely coupled.
Finally, Section 7.9 deals with the technical aspects relevant to the architecture of a microservice-based system. Some of these aspects are presented in depth in the following sections: mechanisms for coordination and configuration (section 7.10), Service Discovery (section 7.11), Load Balancing (section 7.12), scalability (section 7.13), security (section 7.14), and finally documentation and metadata (section 7.15).
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