.NET 7 and Microservices Overview
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Questions and Answers

What is the primary focus of this guide?

  • Development environment and architectural guidance (correct)
  • Infrastructure design for cloud environments
  • Application lifecycle management
  • CI/CD pipelines and team collaboration

Which technology does this guide specifically focus on in conjunction with .NET?

  • Kubernetes
  • Docker (correct)
  • OpenShift
  • Jenkins

Who is the intended audience for this guide?

  • Network security administrators
  • Project managers and stakeholder representatives
  • New developers and solution architects (correct)
  • Software testers and quality assurance managers

Which version of .NET does this guide cover?

<p>.NET 7 (C)</p> Signup and view all the answers

What aspect of application development does this guide specifically avoid covering?

<p>Implementation details on Azure infrastructure (A)</p> Signup and view all the answers

What is the next recommended step after studying this guide?

<p>Learn about production-ready microservices on Microsoft Azure (A)</p> Signup and view all the answers

What does the guide primarily provide for.NET developers?

<p>Proof-of-concept application implementation skills (A)</p> Signup and view all the answers

Which complementary guide focuses on lifecycle management of containerized applications?

<p>Containerized Docker Application Lifecycle with Microsoft Platform and Tools (C)</p> Signup and view all the answers

What is a primary advantage of using .NET 7 in a microservices-oriented system?

<p>.NET 7 is lightweight and has small container images. (A)</p> Signup and view all the answers

Which feature of ASP.NET Core enhances its performance compared to traditional .NET Framework?

<p>It is up to 10 times faster than the traditional .NET Framework. (D)</p> Signup and view all the answers

What design principle does a microservice architecture advocate for?

<p>Small, focused services that have a limited scope. (C)</p> Signup and view all the answers

When is .NET Framework considered a suitable choice?

<p>For existing applications that need to remain on Windows Server containers. (C)</p> Signup and view all the answers

What is one of the benefits of using Docker containers in application deployment?

<p>They simplify deployments by providing isolation and resolving dependency issues. (C)</p> Signup and view all the answers

What allows a microservices architecture to effectively mix technologies across service boundaries?

<p>The ability to gradually migrate services to .NET 7 while using various other technologies. (B)</p> Signup and view all the answers

What is a benefit of using ASP.NET Core images for microservices on Linux or Windows Nano?

<p>They allow for running many microservices with fewer resources. (C)</p> Signup and view all the answers

Why is it important for microservices to have a small Bounded Context?

<p>To ensure they can operate independently with minimal interdependencies. (D)</p> Signup and view all the answers

What is a key advantage of using Windows Nano Server for .NET 7 applications?

<p>It is cloud optimized, smaller, and starts faster. (B)</p> Signup and view all the answers

Which of the following Linux distributions is NOT mentioned as supported for .NET 7 applications?

<p>CentOS (A)</p> Signup and view all the answers

What is the purpose of adding an image name to a Dockerfile?

<p>To select the operating system and version for the Docker image. (B)</p> Signup and view all the answers

Which repository contains .NET SDK images and other .NET versions?

<p>Microsoft Artifact Registry (D)</p> Signup and view all the answers

What optimization focus was adopted by Microsoft for Docker images used in development?

<p>Facilitating the development and building of .NET applications. (C)</p> Signup and view all the answers

When using the image mcr.microsoft.com/dotnet/aspnet:7.0-, what does the suffix '-slim' indicate?

<p>It is a lightweight version of the image designed for efficiency. (D)</p> Signup and view all the answers

Which of the following describes the image repository structure for .NET versions?

<p>Repositories can contain multiple images based on .NET versions and OS. (A)</p> Signup and view all the answers

Which image supports ASP.NET Core 7.0 multi-architecture?

<p>mcr.microsoft.com/dotnet/aspnet:7.0 (A)</p> Signup and view all the answers

What does the ENTRYPOINT definition in a Dockerfile specify?

<p>The command that runs when the container starts (C)</p> Signup and view all the answers

What happens when a long-running process within a container fails?

<p>The orchestrator creates another container instance (C)</p> Signup and view all the answers

How can multiple processes be run within a single container?

<p>By using a Supervisor or similar tool (C)</p> Signup and view all the answers

What is the primary reason for containerizing a monolithic application?

<p>To manage a single deployment with simplicity (D)</p> Signup and view all the answers

In a batch job scenario, when is the work considered complete?

<p>When the process completes execution (C)</p> Signup and view all the answers

What is a potential downside of running multiple processes in a single container?

<p>Increased complexity in process management (A)</p> Signup and view all the answers

What does the term 'scale out' refer to in containerization?

<p>Adding more copies of containers for load distribution (C)</p> Signup and view all the answers

Which of the following is commonly NOT used when designing containers?

<p>Including multiple processes within a single container (C)</p> Signup and view all the answers

What can you do if a platform does not support .NET 7?

<p>File a new feature request in the related GitHub repository. (A), Use the equivalent REST API or the client SDK on .NET Framework. (B)</p> Signup and view all the answers

What is a major advantage of .NET Core over .NET Framework?

<p>Enhanced cross-platform support. (A)</p> Signup and view all the answers

Which scenario requires Linux-based Docker hosts?

<p>Using .NET 7 applications in Docker containers. (A)</p> Signup and view all the answers

What is the recommended approach when extending an existing application that uses the traditional .NET Framework?

<p>Use .NET 7 to write a new service, while keeping the existing application intact. (B)</p> Signup and view all the answers

Which .NET Standard version allows for the most significant API surface compatibility across different frameworks?

<p>.NET Standard 2.0 (D)</p> Signup and view all the answers

Why might some Azure services not support .NET 7 yet?

<p>Current SDK developments are still ongoing. (B)</p> Signup and view all the answers

What must be considered if certain NuGet packages are critical for an application but require Windows to run?

<p>Use .NET Framework within Windows Containers. (A)</p> Signup and view all the answers

What must be considered when deciding on a Docker host for development machines?

<p>All related microservices must run on the same container platform. (A)</p> Signup and view all the answers

Which of the following technologies is NOT available in .NET 7?

<p>ASP.NET Web Forms (A)</p> Signup and view all the answers

Which of the following resources is NOT listed for further reading about .NET?

<p>ASP.NET Design Patterns (D)</p> Signup and view all the answers

How does the Windows Compatibility Pack assist .NET developers?

<p>It allows recompiling existing code to .NET Standard 2.x with minimal modifications. (B)</p> Signup and view all the answers

When converting an existing ASP.NET application to .NET 7, what should be referred to?

<p>The Porting Existing ASP.NET Apps to .NET Core resource. (D)</p> Signup and view all the answers

Which statement accurately describes third-party .NET libraries in relation to .NET Standard?

<p>They are moving towards .NET Standard for better code sharing. (C)</p> Signup and view all the answers

What is true about the available Azure SDKs for .NET 7?

<p>Some may never be ported to .NET 7 for various reasons. (A)</p> Signup and view all the answers

Why might certain .NET Framework technologies never be available in .NET 7?

<p>They don't conform to modern programming paradigms. (D)</p> Signup and view all the answers

What is a major limitation when migrating to .NET Core versions from the traditional .NET Framework?

<p>Certain NuGet packages may not support .NET Core. (D)</p> Signup and view all the answers

Flashcards

Docker

A software packaging and execution environment that allows applications to run in isolated containers, making them portable and self-contained.

Microservices

A free and open-source framework for building, deploying, and running distributed applications.

NET 7

A cross-platform, open-source, and modular framework for building applications.

Development Environment Centric

Focusing on application design without considering the specific infrastructure (cloud or on-premises) in which it will run.

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Containerized Docker Application Lifecycle with Ms Platforms and Tools

A guide that focuses on the application lifecycle, including DevOps, CI/CD pipelines, and team collaboration.

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Production-Ready Applications

The process of creating production-ready applications, ensuring they meet the requirements for stability, performance, and security.

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Infrastructure Agnostic

The ability to run applications on any type of infrastructure without the need for specific configurations.

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Proof-Of-Concept

A proof-of-concept application is a working prototype that demonstrates the feasibility of an idea, but may not be fully functional or production-ready.

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Bounded Context

When designing microservices, a Bounded Context represents a distinct area of knowledge with well-defined boundaries, ensuring that each service has a clear and specific purpose.

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Technology Mix

The ability to combine different technologies within a microservice-based architecture. This allows developers to use the best tools for each specific service.

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Gradual Migration

Leveraging microservices allows for gradual migration to new technologies. New services can use the latest versions of the framework, while older services can continue to use the previous version.

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Scalability

The ability of a system to handle a large volume of requests and scale effectively under demand.

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High Density

The ability to run a high number of instances of a microservice within a limited resource space.

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Docker Containers

The ability to run applications in isolated containers, simplifying deployment and reducing dependency issues.

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Windows Nano Server

A type of container image specifically tailored for Windows Server, known for its lightweight and fast startup capabilities.

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Docker and Windows Containers with .NET Framework

When your existing .NET Framework applications are deployed as monoliths, using Docker and Windows Containers can enhance portability and self-containment.

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Using .NET Framework in Docker Containers

For modernizing existing applications without a full migration to .NET 7, using Docker containers with the traditional .NET Framework is a viable approach.

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Extending Applications with .NET 7

When expanding functionality in legacy applications, consider adding new services written in .NET 7 using ASP.NET Core. This allows for gradual modernization.

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Third-party Libraries and .NET Standard

Third-party .NET libraries are increasingly adopting .NET Standard, enabling cross-platform compatibility, including .NET 7.

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API Surface Compatibility with .NET Standard

Starting with .NET Standard 2.0, the API surface area has expanded, allowing more compatibility across different .NET frameworks.

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Direct Reference to .NET Framework Libraries

Applications built on .NET Core 2.x and newer versions can directly reference existing .NET Framework libraries, leveraging previous code investments.

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Windows Compatibility Pack

The Windows Compatibility Pack extends the API surface for .NET Standard 2.0 on Windows, facilitating the use of .NET Framework libraries in .NET Standard projects.

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Windows-Specific NuGet Packages

While .NET Standard 2.0 and .NET Core brought significant compatibility gains, certain .NET Framework packages might need Windows and remain incompatible with .NET Core or later versions.

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Decision Table

A decision table helps you choose between different technologies based on specific criteria. It outlines the recommended technology for various scenarios.

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Container Platform

A container platform is an environment where containers run – in this case, either a Linux-based or Windows Server-based Docker host.

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Consistent Container Platform

Using the same container platform (Linux or Windows) across your development and production environments ensures consistent performance and behavior.

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Choosing .NET Implementation

Choosing the right .NET implementation (Framework or .NET 7) depends on your specific requirements, such as the OS, container type, and desired features.

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Proof-of-Concept (POC)

A Proof-of-Concept (POC) is a quick and simple implementation designed to demonstrate the feasibility of an idea without fully building a production-ready application.

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Official .NET Docker Images

Publicly available Docker images that are officially created and optimized by Microsoft, providing a wide selection of .NET framework versions and operating system options.

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ASP.NET Core

A flexible and open-source framework used for building web applications, providing a wide range of libraries and tools for developing modern web services.

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Kestrel

A lightweight and high-performance web server that's commonly used for deploying ASP.NET Core applications.

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Development-Focused Images

Focusing on building Docker images tailored for developers, facilitating quick iteration and efficient development workflows.

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Production-Ready Images

Docker images specifically configured for production environments, prioritizing performance, stability, and security.

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Alpine Linux

A lightweight and minimal Linux distribution known for its small size and fast startup, often used for building container images.

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ENTRYPOINT

The process that defines the container's lifecycle, running until it completes and ending the container.

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Multiple Processes in a Container

The process of running multiple programs within a single container, often handled by tools like Supervisor.

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Containerized Monolithic Application

A monolithic application deployed as a single container, with multiple internal components, libraries, or layers. Scaled by adding more of the same container.

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Scaling Monolithic Containers

Deploying a single container to represent a monolith application, allowing scaling out by adding more copies with a load balancer.

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Container Lifecycle

A container lifecycle is controlled by the process defined in the ENTRYPOINT. When the process completes, the container ends.

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Orchestrator's role in Failed Containers

The orchestrator, like Kubernetes, monitors container health. If a container fails, it creates a new one to replace the failed process.

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Batch Jobs in Containers

Batch jobs within containers can be initiated with parameters and complete their work when their process ends.

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Supervisor for Multiple Processes

Using tools like Supervisor to run multiple programs within a single container, overcoming the limitation of one ENTRYPOINT.

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Study Notes

Foundational Development and Architectural Guidance

  • This guide focuses on development environment level guidance for Docker and .NET, omitting infrastructure specifics (cloud/on-premises).
  • Decisions about infrastructure are for later in the production application creation stage.
  • The guide is infrastructure-agnostic but development-centric. The next step is learning about production-ready microservices on Microsoft Azure.
  • Updated to cover .NET 7 and aligning with Azure and relevant third-party technologies.

.NET 7 and Microservices

  • .NET 7 is ideal for microservices-based containerized systems due to its lightweight nature and lean container images.
  • Microservices should be small, light, and fast-initiating to have a small footprint, small Bounded Context, representation of small areas of concern, quick start/stop capability.
  • Use .NET 7 for new microservices that can co-exist with other services built with different technologies (Node.js, Python, Java, GoLang).
  • Deploying high density requires .NET and ASP.NET Core for optimum speed and performance (10x faster than ASP.NET).

.NET Framework Considerations

  • .NET Framework remains suitable for existing applications, especially during migration.
  • Migrating existing applications need not be to .NET. 7, where Docker containers with .NET Framework can be used.
  • Extending existing applications can use .NET 7 for new services in ASP.NET Core format.
  • Most third-party libraries are compatible with .NET Standard, enabling code sharing across .NET versions.

Technologies Not in .NET 7

  • ASP.NET Web Forms
  • Workflow-related services (Windows Workflow Foundation, Workflow Services, WCF Data Services).
  • Other features may follow in future .NET releases.

Supporting Platforms and APIs

  • Some Microsoft and third-party platforms might not fully support.NET 7 yet.
  • Migrate to .NET via steps outlined in appropriate resources.

Docker Images and Implementations

  • Development and Production Docker Images: Microsoft optimizes images for development contexts.
  • For development, container images act as process boundary units, scaled and batched for ease of process management.
  • Dockerfiles implement ENTRYPOINT (single process per container, which ends container lifecycle)
  • A script or tool like Supervisor may be used for launching multiple programs within a container if required.

Monolithic Application Containerization

  • Monolithic applications can be containerized for simpler deployment, isolated testing, and dependence mitigation.
  • One container per monolithic application is managed, scaled as needed (e.g., load balancers for multiple instances).

Official .NET Docker Images

  • Microsoft creates and optimizes official .NET Docker images.
  • Search across the Microsoft Artifact Registry for .NET image repositories based on framework versions and the OS (Linux, Windows).

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Related Documents

NET Microservices Architecture for Containerized .NET Applications PDF v7.0

Description

Explore the foundational development guidance for building microservices with .NET 7. This guide emphasizes a development-centric approach while remaining infrastructure-agnostic, preparing you for production-ready applications on Microsoft Azure. Dive into the advantages of using .NET 7 for lightweight, efficient microservices.

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