Top 150 Microservices Interview Questions and Answers

Saga patterns are used to manage long-running transactions in a microservices architecture.

• Saga patterns help ensure consistency and reliability in distributed systems.

• They are used to coordinate multiple microservices to complete a complex transacti...read more

Microservices communicate with each other through APIs, message queues, or event-driven architecture.

• APIs: Microservices can communicate with each other through RESTful APIs or GraphQL.

• Message queues: Services can use message brokers like RabbitMQ or...read more

Circuit Breaker is a design pattern used in microservices to prevent cascading failures.

• Circuit Breaker monitors the availability of a service and prevents requests from being sent if the service is unavailable.

• It helps in improving the resilience of...read more

Design patterns in Micro services help in solving common architectural challenges.

• Service Registry pattern

• Circuit Breaker pattern

• Gateway pattern

• Saga pattern

• API Gateway pattern

Microservices can be secured by implementing authentication, authorization, encryption, and monitoring.

• Implement authentication and authorization to ensure only authorized users can access the microservices.

• Use encryption to protect sensitive data in...read more

Debugging a microservice based application involves identifying and resolving issues in individual services.

• Start by reproducing the issue and gathering relevant logs and error messages

• Use logging and monitoring tools to track the flow of data and id...read more

Microservices are smaller, independent services that work together, while monolithic model is a single, large application.

• Microservices are smaller, independent services that can be developed, deployed, and scaled independently.

• Monolithic model is a ...read more

Microservices in JavaScript are small, independent, and loosely coupled services that work together to form a larger application.

• Microservices are designed to be modular and scalable

• Each microservice performs a specific task and communicates with oth...read more

A REST API in microservices enables communication between services using standard HTTP methods for data exchange.

• REST stands for Representational State Transfer, a set of architectural principles.

• Microservices are small, independent services that com...read more

Microservices are a architectural style that structures an application as a collection of loosely coupled services, while APIs are interfaces that allow different software systems to communicate with each other.

• Microservices are independent, self-con...read more

Vertical scaling increases the capacity of a single server, while horizontal scaling adds more servers to distribute the load.

• Vertical scaling involves increasing the resources of a single server, such as CPU, RAM, or storage.

• Horizontal scaling invol...read more

Transactions across microservices can be handled using distributed transactions or compensating transactions.

• Use distributed transactions to ensure all services commit or rollback together

• Implement compensating transactions to handle failures and mai...read more

Technologies like Kafka, RabbitMQ, and Apache Pulsar can be used to update microservices with data.

• Kafka

• RabbitMQ

• Apache Pulsar

Microservices architecture is a distributed approach where an application is broken down into smaller, independent services, while monolithic architecture is a traditional approach where the entire application is built as a single unit.

• Microservices ...read more

A Dockerfile to build a microservices application

• Use a base image like Alpine Linux or Ubuntu

• Install necessary dependencies and libraries

• Copy the application code into the container

• Expose the required ports

• Specify the command to run the microservice

Micro refers to small or microscopic organisms that are too small to be seen with the naked eye.

• Microorganisms include bacteria, viruses, fungi, and protozoa.

• They play important roles in various fields such as medicine, agriculture, and industry.

• Some...read more

Microservices can be deployed in AWS using services like ECS, EKS, Lambda, or Fargate.

• Microservices can be deployed on AWS Elastic Container Service (ECS) for containerized applications.

• AWS Elastic Kubernetes Service (EKS) can be used for deploying m...read more

Automating microservices involves using tools like Docker, Kubernetes, and CI/CD pipelines.

• Use containerization tools like Docker to package microservices into containers.

• Utilize orchestration tools like Kubernetes to manage and scale microservices.

• I...read more

Microservices route using API gateways and service discovery mechanisms.

• Microservices communicate through API gateways which route requests to the appropriate service

• Service discovery mechanisms help microservices locate and communicate with each oth...read more

Designing Kafka and microservices architecture for scalability and fault tolerance

• Use Kafka as a distributed streaming platform to handle large volumes of data

• Implement microservices architecture to break down the application into smaller, independen...read more

Spring Boot microservices are small, independent, loosely coupled services built using the Spring Boot framework.

• Microservices are small, independent services that work together to form a larger application.

• Spring Boot is a framework that simplifies ...read more

MSA stands for Measurement System Analysis. It is used to assess the capability and reliability of a measurement system.

• MSA helps in identifying sources of variation in measurement processes

• It ensures that the measurement system is accurate, precise,...read more

Exceptions in Microservices are handled by logging, returning error codes, and using circuit breakers.

• Log exceptions with relevant details for debugging purposes

• Return appropriate error codes to the client

• Use circuit breakers to prevent cascading fai...read more

Microservices can be connected through APIs, message queues, or service mesh.

• Use APIs to allow microservices to communicate with each other over HTTP or other protocols.

• Implement message queues like RabbitMQ or Kafka for asynchronous communication be...read more

A user microservice to retrieve data from h2DB

• Create a REST API endpoint to handle user requests

• Use JDBC to connect to the h2DB and retrieve data

• Implement caching to improve performance

• Ensure proper error handling and logging

• Secure the API with authe...read more

Understanding of managing MVC and microservices is good

• MVC is a design pattern that separates an application into three components: Model, View, and Controller

• Microservices is an architectural style that structures an application as a collection of s...read more

CORS (Cross-Origin Resource Sharing) is a security feature that allows or restricts access to resources from different domains.

• CORS is used to prevent unauthorized access to resources from different domains

• It is implemented by adding specific headers...read more