Over the years, numerous technologies, best practices, and architectures have sprung up in the software development industry. Microservices is the architectural trend in the software development circles these days, which is being adopted by top organizations like Amazon, Netflix, Uber, eBay, and more in their products. The most important fact is that DevOps works very well with Microservices.
But what is Microservice? Why should you consider moving to a Microservice architecture?
This blog will clear all your doubts about getting started with Microservices.
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To get a clear idea about Microservices, first, you need to understand the concept of Monolithic Architecture. In a Monolithic Architecture, all processes are coupled together and run as a single service. If any process of the application encounters difficulties, then you must scale the entire architecture. Adding or improving features of the monolithic application gets more complicated as code grows. The risk of failure is high in monolithic architecture as all processes are dependent and tightly coupled.
Microservices overcome the challenges that prevailed in Monolithic architecture. So, what a Microservice is?
Microservices (or Microservices architecture) is an architectural approach that structures an application as a collection of services that are highly maintainable and testable, independently deployable, loosely coupled, and organized around business capabilities. Small, self-contained teams own these services. In simple words, it's a method of development where an extensive application is divided into short modular services assisting a specific business goal.
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What sets Microservices architecture apart from traditional, monolithic architectures is all processes are distributed and loosely coupled, so one team's changes won't break an entire app. It means individual services can function effectively without impacting others. In recent years, the trend for Microservices has seen an upsurge, as the enterprises are looking to become more agile and move towards continuous testing and DevOps.
Next in this What is Microservices blog, let’s understand how many types of Microservices are available.
There are two types of Microservices:
As the name suggests, stateless services do not maintain a session state between requests. For suppose, if any of the service instances gets removed, it won't affect the overall performance logic for the service. Distributed systems mostly prefer stateless Microservices.
Stateful Microservices maintain session information in the code. When more than two Microservices interact with each other, they keep a service request state. In real world, stateless Microservices are the best choice compared to stateful services.
Now, let's understand more about Microservices architecture.
The microservice architecture comprises a collection of small, autonomous services, where each service is self-contained and should implement a single business capability. If the application is complex, Microservices architecture lets you break it into component functionalities and create each of them into independent and self-contained services.
Each service is a separate codebase and communicates with each other through Application Programming Interfaces (APIs). There are some more components in the architecture, like management/orchestration and API gateway.
Management/orchestration - This component is responsible for identifying failures, placing services on nodes, and much more.
API gateway - It is an entry point for clients' gateway.
Now that you understand what a microservice architecture is. Next, let’s learn more about its characteristics.
|Also, Check Out Microservices Architecture Tutorial|
There is no particular way to get started with Microservices architecture. However, there are some common approaches which many companies have adopted Microservices architecture and found success. Let's discuss them.
First, define the services corresponding to the business capabilities. Next, assign each service to a different team who are experts for those particular services. It often leads to stable API boundaries.
After service boundaries are decided for those small services, they are developed by the teams using the technologies which are best suited for a particular purpose. After developing, through available CI servers (Jenkins, Go, etc.) CI/CD pipelines built to run automated test cases and to deploy services independently to different environments (QA, integration, Staging, etc.)
Design the independent services carefully about what to be exposed to, what protocols are used to interact with the service, etc.
Organizations found success with Microservices followed a model where the teams building services take responsibility for everything related to that service. There are no separate maintenance teams. They are the ones who develop, deploy and maintain it.
There are some more architectural patterns that help in decentralizing things.
There are two standard models used to deploy independent Microservices. They are multiple Microservices per operating system and one microservice per operating system.
Creating the best standards and best practices while running the different services independently through multiple teams is always helpful in the long run.
Services in Microservices architecture are distributed by nature; monitoring and logging of individual services can become a challenge. It's hard to go through and compare logs of each service instance and find out individual errors. Log aggregation and stats aggregation are used to solve such challenges.
|Related Blog: Microservices vs SOA|
The benefits of Microservices seem strong enough to have convinced some top companies such as Netflix, eBay, and Amazon to adopt the methodology:
|Frequently Asked Microservices Interview Questions & Answers|
Despite the benefits of Microservices, it’s not always the best choice for every organization. The significant challenges faced with Microservices architecture are listed below:
Customers in a variety of verticals have a keen interest in the advantages of applications designed with the Microservices architecture are:
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Enterprise adoption of Microservices is continuing to rise. Developers implementing Microservices as their default application architecture is expected to increase even more in the coming years.
Here are some of the predictions about Microservices for the coming years:
Microservices architecture is quickly becoming the preferred choice of building applications throughout industries. The benefits of Microservices are clearly worth it for growing numbers of modern software organizations.
With this, we've come to the end of this "What is Microservices" article. Hope the information shared was relevant for you. If you find this article helpful, please feel free to share it on other channels.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .