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This guide is an introduction to developing microservices-based applications and managing them using containers. It discusses architectural design and implementation approaches using .NET Core and Docker containers.

To make it easier to get started, the guide focuses on a reference containerized and microservice-based application that you can explore.

Introduction

Enterprises are increasingly realizing cost savings, solving deployment problems, and improving DevOps and production operations by using containers. Microsoft has been releasing container innovations for Windows and Linux by creating products like Azure Kubernetes Service and Azure Service Fabric, and by partnering with industry leaders like Docker, Mesosphere, and Kubernetes. These products deliver container solutions that help companies build and deploy applications at cloud speed and scale, whatever their choice of platform or tools.
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Docker is becoming the de facto standard in the container industry, supported by the most significant vendors in the Windows and Linux ecosystems. (Microsoft is one of the main cloud vendors supporting Docker.) In the future, Docker will probably be ubiquitous in any datacenter in the cloud or on-premises.

In addition, the microservices architecture is emerging as an important approach for distributed mission-critical applications. In a microservice-based architecture, the application is built on a collection of services that can be developed, tested, deployed, and versioned independently.
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About this guide**

This guide is an introduction to developing microservices-based applications and managing them using containers. It discusses architectural design and implementation approaches using .NET Core and Docker containers. To make it easier to get started with containers and microservices, the guide focuses on a reference containerized and microservice-based application that you can explore. The sample application is available at the eShopOnContainers GitHub repo.

This guide provides foundational development and architectural guidance primarily at a development environment level with a focus on two technologies: Docker and .NET Core. Our intention is that you read this guide when thinking about your application design without focusing on the infrastructure (cloud or on-premises) of your production environment. You will make decisions about your infrastructure later, when you create your production-ready applications. Therefore, this guide is intended to be infrastructure agnostic and more development-environment-centric.

After you have studied this guide, your next step would be to learn about production-ready microservices on Microsoft Azure.
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Version**
This guide has been revised to cover .NET Core 3.1 version along with many additional updates related to the same “wave” of technologies (that is, Azure and additional third-party technologies) coinciding in time with the .NET Core 3.1 release. That’s why the book version has also been updated to version 3.1

Related microservice and container-based reference application: eShopOnContainers
The eShopOnContainers application is an open-source reference app for .NET Core and microservices that is designed to be deployed using Docker containers. The application consists of multiple subsystems, including several e-store UI front ends (a Web MVC app, a Web SPA, and a native mobile app). It also includes the back-end microservices and containers for all required server-side operations.

The purpose of the application is to showcase architectural patterns. IT IS NOT A PRODUCTION-READY TEMPLATE to start real-world applications. In fact, the application is in a permanent beta state, as it’s also used to test new potentially interesting technologies as they show up.
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