Microservices Interview Questions & Answers

Microservice Architecture is an architectural development style which builds an application as a collection of small autonomous services developed for a business domain.

  • Wiremock, 2.) Docker and 3.) Hysrix are important Microservices tool.

Monolithic architecture is like a big container in which all the software components of an application are clubbed inside a single package.

Here, are some significant advantages of using Microservices:

  • Technology diversity, e., Microservices can mix easily with other frameworks, libraries,  and databases
  • Fault isolation, e., a process failure should not bring the whole system down.
  • Greater support for smaller and parallel team
  • Independent deployment
  • Deployment time reduce

Spring cloud is an Integration software that integrates with external systems. It allows microservices framework to build applications which perform restricted amounts of data processing.

Reports and dashboards help in monitoring and upkeep of Microservices. Tons of Application Monitoring Tools assist in this.

Microservices Monolithic Architecture
Service Startup is fast Service startup takes time
Microservices are loosely coupled architecture. Monolithic architecture is mostly tightly coupled.
Changes done in a single data model does not affect other Microservices. Any changes in the data model affect the entire database
Microservices  focuses  on products, not projects Monolithic put emphasize over the whole project
  • Microservices always rely on each other. Therefore, they need to communicate with each other.
  • As it is distributed system, it is a heavily involved model.
  • If you are using Microservice architecture, you need to ready for operations overhead.
  • You need skilled professionals to support heterogeneously distributed microservices.

Microservice architecture is best suited for desktop, web, mobile devices, Smart TVs, Wearable, etc.

Most large-scale websites like Twitter, Netflix, Amazon, have advanced from a monolithic architecture to a microservices architecture.

Representational State Transfer (REST)/RESTful web services is an architectural style that helps computer systems to communicate over the internet. These web services make microservices easier to understand and implement.

In Microservice architecture tests are divided into three broad categories:

  • At the bottom level test, we can perform a general test like performance and unit tests. These kinds of tests are entirely automated.
  • At the middle level, we can perform exploratory tests like the stress tests and usability tests.
  • At the top level, we can conduct acceptance tests which are mostly fewer in numbers. It also helps stakeholders to know about different software features.

Client certificates is a digital certificate used to make authenticated requests to a remote server. It is termed as a client certificate.

It is an open source tool which allows testing interactions between service providers and consumers. However, it is separated from the contract made. This increases the reliability of the Microservices applications.

OAuth means open authorization protocol. This protocol allows you to access the client applications on HTTP for third-party providers GitHub, Facebook, etc. It helps you to share resources stored on one site with another site without the need for their credentials.

End-to-end testing validates every process in the workflow is functioning correctly. It also ensures that the system works together as a whole and satisfies all requirements.

Containers are easiest and effective method to manage the microservice based application. It also helps you to develop and deploy individually. Docker also allows you to encapsulate your microservice in a container image along with its dependencies. Microservice can use these elements without additional efforts.

Semantic monitoring combines automated tests with monitoring of the application. It allows you to find out reasons why your business is not getting more profits.

CDC is Consumer-Driven Contract. It is a pattern for developing Microservices so that external systems can use them.

Docker offers a container environment which can be used to host any application. This software application and the dependencies that support it which are tightly-packaged together.

Reactive Extensions is also called Rx. It is a design pattern which allows collecting results by calling multiple services and then compile a combined response. Rx is a popular tool in distributed systems which works exactly opposite to legacy flows.

Continuous monitoring is a method which is used for searching compliance and risk issues associated with a company’s operational and financial environment. It contains human, processes, and working systems which support efficient and actual operations.

It depends upon your project needs. However, in most cases, developers use HTTP/REST with JSON or Binary protocol. However, they can use any communication protocol.

Microservice architecture is best suited for desktop, web, mobile devices, Smart TVs, Wearable, etc.