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Microservices Interview Questions

What do you mean by microservice?

Microservice interview questions
Microservices, also known as microservices architecture, is basically an SDLC approach where large applications are built as a collection of small functional modules. It is one of the most widely accepted architectural concepts in software development. This architecture not only makes maintenance easier, but also speeds up programming. Additionally, microservices are also a great asset for the latest software development methods such as DevOps and Agile. In addition, it helps you deliver large, complex applications quickly, frequently, and reliably. Applications are modeled as sets of services, which are:
  • Maintained and testable
  • Loosely tied
  • Possibility of self-implementation
  • Designed or organized around a business opportunity
  • Managed by a small team

Name three common tools mostly used for microservices

Three common tools used for microservices include:
  • Wiremock
  • Docker
  • Hystrix

What are the advantages and disadvantages of microservices?

Benefits:

  • Standalone and standalone deployment module.
  • Independently managed services.
  • To improve performance, the on-demand service can be deployed across multiple servers.
  • It’s easier to test and has fewer dependencies.
  • A greater degree of scalability and agility.
  • Simplicity in debugging and maintenance.
  • Better communication between developers and business users.
  • Smaller sized development teams.

Disadvantages:

  • Due to the complexity of the architecture, testing and monitoring is more difficult.
  • It lacks an adequate corporate culture to function.
  • Pre-planning is essential.
  • Complex development.
  • It requires a cultural change.
  • Expensive compared to monoliths.
  • Security Implications.
  • Maintaining the network is more difficult.

Explain container in microservices

Containers are useful technologies for allocating and sharing resources. It is considered the most effective and easiest method of managing microservice-based applications to develop and deploy them individually. Using Docker, you can also wrap a microservice along with its dependencies into a container image, which can then be used to roll over on-demand instances of the microservice without any additional work.

Explain the term Eureka in microservices

Eureka Server, also known as Netflix Service Discovery Server, is an application that tracks all customer service applications. As every microservice registers with Eureka Server, Eureka Server knows all client applications running on different ports and IP addresses. It usually uses Spring Cloud and is not heavy on the application development process.

What do you mean by distributed transaction?

Distributed transactions are an outdated approach in today’s microservice architecture that leaves the developer with serious scalability issues. Transactions are distributed to various services that are called to complete the transaction in sequence. With so many moving parts, it’s very complex and prone to failure.

What do you mean by Mike Cohn’s Test Pyramid?

Microservices interview questions Mike Cohn’s Test Pyramid explains the different types of automated tests required for software development. The test pyramid is primarily used to maximize automation across all levels of testing, including unit testing, service level testing, UI testing, etc. The pyramid also claims that unit tests are faster and more isolated, while UI tests, which are at the top, are more time-consuming and integration-centric.

What is semantic tracking?

The semantic monitoring process, also known as synthetic monitoring, uses automated testing and application monitoring to detect errors in business processes. This technology provides deeper insight into transaction performance, service availability, and overall application performance to identify microservices performance issues, detect transaction failures, and achieve higher overall performance.

Why are containers used in microservices?

Containers are the easiest and most efficient way to manage your microservice-based application. It also helps you develop and implement individually. Docker also allows you to encapsulate your microservice along with its dependencies in a container image. The microservice can use these elements without additional effort.

Explain continuous monitoring

Ongoing monitoring includes identifying compliance and risk issues in a company’s financial and operating environment. It consists of people, processes and work systems that support efficient and effective operation.

What role does the actuator play in the Spring Boot?

A Spring Boot Actuator is a project that provides silent web services to access the current state of an application running in production. You can also monitor and manage application usage in a production environment without programming or configuring any of the applications.

What is RESTful?

Representational State Transfer (REST) ​​/ RESTful Web Services is a style of architecture that helps computer systems communicate over the Internet. These web services make microservices easier to understand and implement.

What do you mean by domain-driven design?

DDD (Domain-Driven-Design) is basically an architecture style based on object-oriented analysis design approaches and principles. In this approach, the business area is carefully modeled in software, regardless of how the system actually works. By connecting related components of the software system to a constantly evolving system, it facilitates the development of complex systems.

What is End-to-End Microservices Testing?

End-to-end testing verifies that all processes in the workflow are working properly. It also ensures that the system as a whole works together and meets all requirements.

What does semantic monitoring mean in microservices architecture?

Semantic monitoring combines automated testing with application monitoring. It enables you to find out why your business is no longer making a profit.

Can you say something about rest and microservices?

REST

Although you can implement microservices in various ways, REST over HTTP is one way to implement microservices. REST is also used in other applications such as web applications, API design, and MVC applications to provide business data.

Microservices

Microservices is an architecture in which all components of the system are combined into individual components that can be individually created, provisioned, and scaled. There are certain microservices principles and best practices that help build a resilient application. In short, REST is a mean s of creating microservices.

What are reactive extensions in microservices?

Reactive extensions are also called Rx. It is a design pattern that allows you to collect results by calling multiple services and then creating a combined response. Rx is a popular tool in distributed systems that works exactly the reverse of legacy streams.

What is the WebMvcTest annotation used for in Spring MVC applications?

The WebMvcTest annotation is used for unit testing Spring MVC applications when the goal of testing is to focus only on Spring MVC components. In the snapshot shown above, we just want to start ToTestController. All other controllers and mappings will not start when this unit test is run.

What is a limited context?

Bounded context is a central pattern in domain-driven design. He’s at the heart of DDD’s strategic design department, which deals with working with large models and equipment. DDD deals with large models by dividing them into different bounded contexts and explicitly describing their interrelationships.

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