How would you describe microservices in interview?

How would you describe microservices in interview?

Microservices are an architectural approach or style that is used to build applications. The microservice architecture provides a rapid, frequent and reliable delivery of large and complex applications. It is distributed and loosely coupled, so it won’t break the entire app if you make changes in one team.

How do microservices communicate with each other interview question?

Microservices Interview Questions for Experienced

• What do you mean by Semantic Monitoring?
• Explain continuous monitoring.
• What do you mean by Domain driven design?
• Explain OAuth.
• What do you mean by Distributed Transaction?
• Explain Idempotence and its usage.
• What do you mean by end-to-end microservices testing?

What are the biggest challenges in microservices deployment Mcq?

Answer: The challenges in Microservice can be both technical as well as functional. From the point of business, the main challenges are: Require heavy investment. Heavy Infrastructure Setup.

Which case microservice architecture is best suited?

If you have a business focus and you want to solve a use case or a problem efficiently without the boundaries of technology, want to scale an independent service infinitely, highly available stateless services which are easy to maintainable and managed as well as independently testable then we would go ahead and …

What is an API gateway in microservices?

An API gateway is a software application between a client and a set of backend microservices. The API Gateway serves as a reverse proxy to accept API calls from the client application, forwarding this traffic to the appropriate service.

How do you communicate with two microservices?

There are two basic messaging patterns that microservices can use to communicate with other microservices.

1. Synchronous communication. In this pattern, a service calls an API that another service exposes, using a protocol such as HTTP or gRPC.
2. Asynchronous message passing.

How do you handle if one microservice is down?

To deal with partial failures, use one of the strategies described here.

1. Use asynchronous communication (for example, message-based communication) across internal microservices.
2. Use retries with exponential backoff.
3. Work around network timeouts.
4. Use the Circuit Breaker pattern.
5. Provide fallbacks.

What is difference between monolithic and microservices?

A monolithic application is built as a single unified unit while a microservices architecture is a collection of smaller, independently deployable services.

What is difference between API and API gateway?

API is an acronym for Application Programming Interface. It is a set of definitions and protocols that allow technology products and services to communicate with each other via the internet. An API Gateway is used as the entry point for client requests to an API.

What is ZUUL used for?

Zuul is an edge service that proxies requests to multiple backing services. It provides a unified “front door” to your system, which allows a browser, mobile app, or other user interface to consume services from multiple hosts without managing cross-origin resource sharing (CORS) and authentication for each one.

Which database is best for microservices?

For some services, a relational database is the best choice. Other services might need a NoSQL database such as MongoDB, which is good at storing complex, unstructured data, or Neo4J, which is designed to efficiently store and query graph data.

How load balancing is done in microservices?

Load balancing is the process of sharing, incoming network traffic in concurrent or discrete time between servers called a server farm or server pool. This sharing process can be evenly scale or can be performed according to certain rules. Rules like Round Robin, Least Connections etc.

How do you avoid fault tolerance in microservices?

The solution to this problem is to use a fallback in case of failure of a microservice. This aspect of a microservice is called fault tolerance. Fault tolerance can be achieved with the help of a circuit breaker. It is a pattern that wraps requests to external services and detects when they fail.

What are the 3 C’s of microservices?

When you are ready to start adopting a microservices architecture and the associated development and deployment best practices, you’ll want to follow the three C’s of microservices: componentize, collaborate, and connect.

Is postman API a gateway?

Our AWS API Gateway integration is available within each of your workspaces via the Postman web dashboard. This means you can sync your OpenAPI and Swagger definitions to AWS, using Postman to help design, develop, and now manage your APIs.

Is REST API a type of API?

REST, which stands for representational state transfer, is a set of guidelines for scalable, lightweight, and easy-to-use APIs. A REST API (or “RESTful” API) is an API that follows REST guidelines and is used for transferring data from a server to a requesting client.

What is difference between Eureka and Zuul?

Eureka belongs to “Open Source Service Discovery” category of the tech stack, while Zuul can be primarily classified under “Microservices Tools”. Eureka is an open source tool with 8.16K GitHub stars and 2.27K GitHub forks. Here’s a link to Eureka’s open source repository on GitHub.

Is Zuul an API gateway?

Zuul is Netflix’s Java-based API gateway.

Can 2 microservices connect to same database?

Yes, it’s possible to integrate a database for microservices. You can create a single shared database with each service accessing data using local ACID transactions.

Can a microservice have two databases?

It means that we can use different database technologies for different microservices. So one service may use an SQL database and another one a NoSQL database. That’s feature allows using the most efficient database depending on the service requirements and functionality.

What is Layer 4 load balancing?

Layer 4 load balancing, operating at the transport level, manages traffic based on network information such as application ports and protocols without visibility into the actual content of messages. This is an effective approach for simple packet-level load balancing.

What is API gateway vs load balancer?

API gateways also handle all of the interpretations and protocols that occur between various pieces of software. An API gateway, for example, connects micro-services, whereas load balancers redirect multiple instances of the same micro-service element as it scales out.

How do you handle latency in microservices?

1. Don’t do a connection setup per RPC.
2. Cache things wherever possible.
3. Write asynchronous code wherever possible.
4. Exploit eventual consistency wherever possible.
5. Route your requests sensibly.
6. Locate processing wherever will result in the best latency.
7. Use LIFO queues, they have better tail statistics than FIFO.

What are the 12 factors of microservices?

The Twelve Factors

• I. Codebase. One codebase tracked in revision control, many deploys.
• II. Dependencies. Explicitly declare and isolate dependencies.
• III. Config. Store config in the environment.
• IV. Backing services.
• V. Build, release, run.
• VI. Processes.
• VII. Port binding.
• VIII. Concurrency.

What is REST API vs HTTP API?

REST APIs support more features than HTTP APIs, while HTTP APIs are designed with minimal features so that they can be offered at a lower price. Choose REST APIs if you need features such as API keys, per-client throttling, request validation, AWS WAF integration, or private API endpoints.