NET-Microservices-Architecture-for-Containerized-NET-Applications

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• ASP.NET Web Forms. This technology is only available on .NET Framework. Currently there areno plans to bring ASP.NET Web Forms to .NET or later.• WCF services. Even when a WCF-Client library is available to consume WCF services from .NET 6,as of Jan-2021, the WCF server implementation is only available on .NET Framework.• Workflow-related services. Windows Workflow Foundation (WF), Workflow Services (WCF + WFin a single service), and WCF Data Services (formerly known as ADO.NET Data Services) are onlyavailable on .NET Framework. There are currently no plans to bring them to .NET 6.In addition to the technologies listed in the official .NET roadmap, other features might be ported tothe new unified .NET platform. You might consider participating in the discussions on GitHub so thatyour voice can be heard. And if you think something is missing, file a new issue in the dotnet/runtimeGitHub repository.Using a platform or API that doesn’t support .NET 6Some Microsoft and third-party platforms don’t support .NET 6. For example, some Azure servicesprovide an SDK that isn’t yet available for consumption on .NET 6 yet. Most Azure SDK shouldeventually be ported to .NET 6/.NET Standard, but some might not for several reasons. You can seethe available Azure SDKs in the Azure SDK Latest Releases page.In the meantime, if any platform or service in Azure still doesn’t support .NET 6 with its client API, youcan use the equivalent REST API from the Azure service or the client SDK on .NET Framework.Porting existing ASP.NET application to .NET 6.NET Core is a revolutionary step forward from .NET Framework. It offers a host of advantages over.NET Framework across the board from productivity to performance, and from cross-platform supportto developer satisfaction. If you are using .NET Framework and planning to migrate your applicationto .NET Core or .NET 5+, see Porting Existing ASP.NET Apps to .NET Core.Additional resources• .NET fundamentalshttps://docs.microsoft.com/dotnet/fundamentals• Porting Projects to .NET 5https://docs.microsoft.com/events/dotnetconf-2020/porting-projects-to-net-5• .NET on Docker Guidehttps://docs.microsoft.com/dotnet/core/docker/introductionDecision table: .NET frameworks to use for DockerThe following decision table summarizes whether to use .NET Framework or .NET 6. Remember thatfor Linux containers, you need Linux-based Docker hosts (VMs or servers) and that for WindowsContainers you need Windows Server based Docker hosts (VMs or servers).13 CHAPTER 2 | Choosing Between .NET 6 and .NET Framework for Docker Containers
ImportantYour development machines will run one Docker host, either Linux or Windows. Related microservicesthat you want to run and test together in one solution will all need to run on the same containerplatform.Architecture / App Type Linux containers Windows ContainersMicroservices on containers .NET 6 .NET 6Monolithic app .NET 6 .NET Framework.NET 6Best-in-class performance andscalabilityWindows Server legacy app(“brown-field”) migration tocontainersNew container-baseddevelopment (“green-field”).NET 6 .NET 6– .NET Framework.NET 6 .NET 6ASP.NET Core .NET 6 .NET 6 (recommended).NET FrameworkASP.NET 4 (MVC 5, Web API 2,and Web Forms)– .NET FrameworkSignalR servicesWCF, WF, and other legacyframeworks.NET Core 2.1 or higherversionWCF in .NET Core (clientlibrary only)Consumption of Azure services .NET 6(eventually most Azureservices will provide clientSDKs for .NET 6).NET Framework.NET Core 2.1 or higher version.NET FrameworkWCF in .NET 6 (client library only).NET Framework.NET 6(eventually most Azure serviceswill provide client SDKs for .NET6)What OS to target with .NET containersGiven the diversity of operating systems supported by Docker and the differences between .NETFramework and .NET 6, you should target a specific OS and specific versions depending on theframework you are using.For Windows, you can use Windows Server Core or Windows Nano Server. These Windows versionsprovide different characteristics (IIS in Windows Server Core versus a self-hosted web server likeKestrel in Nano Server) that might be needed by .NET Framework or .NET 6, respectively.For Linux, multiple distros are available and supported in official .NET Docker images (like Debian).In Figure 3-1, you can see the possible OS version depending on the .NET framework used.14 CHAPTER 2 | Choosing Between .NET 6 and .NET Framework for Docker Containers
Page 2 and 3: EDITION v6.0 - Updated to ASP.NET C
Page 4 and 5: The second part of the guide starts
Page 6 and 7: All rights reserved. No part of the
Page 8 and 9: Manage state and data in Docker app
Page 10 and 11: Simplified workflow when developing
Page 12 and 13: Design a microservice domain model
Page 14 and 15: Issues with the original HttpClient
Page 16 and 17: CHAPTER 1Introduction to Containers
Page 18 and 19: directly on macOS.) Developers who
Page 20 and 21: 2. To issue a set of letters, you p
Page 22 and 23: you can deploy the whole multi-cont
Page 24 and 25: CHAPTER 2Choosing Between .NET 6and
Page 26 and 27: can use it to develop containerized
Page 30 and 31: Figure 3-1. Operating systems to ta
Page 32 and 33: In productionWhat is important in p
Page 34 and 35: You might find a scenario where you
Page 36 and 37: Figure 4-3. Example of multiple hos
Page 38 and 39: should assume that container images
Page 40 and 41: • File storage offers shared stor
Page 42 and 43: evolve them autonomously while main
Page 44 and 45: be accessed either synchronously th
Page 46 and 47: As Figure 4-8 shows, the catalog bu
Page 48 and 49: scalability in collaborative scenar
Page 50 and 51: Challenge #4: How to design communi
Page 52 and 53: Sam Newman, a recognized promoter o
Page 54 and 55: Figure 4-11. Decomposing traditiona
Page 56 and 57: • How can client apps minimize th
Page 58 and 59: Figure 4-13. Using an API Gateway i
Page 60 and 61: For more information, see Gateway r
Page 62 and 63: using PaaS products like Azure API
Page 64 and 65: A microservices-based application i
Page 66 and 67: Figure 4-15. Anti-patterns and patt
Page 68 and 69: When a client uses request/response
Page 70 and 71: Azure Service Bus. In this scenario
Page 72 and 73: and Query Responsibility Segregatio
Page 74 and 75: Creating, evolving, and versioning
Page 76 and 77: consuming the microservices, which
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• Mauro Servienti. The secret of
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Orchestrators managing health and d
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Figure 4-23. A cluster of container
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configuration of popular open-sourc
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For more implementation information
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Additional resources• Visual Stud
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Step 1. Start coding and create you
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Figure 5-3. Enabling Docker Support
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• Build your own image. In the of
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• Line #5: Begin a new stage with
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Step 3. Create your custom Docker i
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- sqldatasqldata:image: mcr.microso
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Option A: Running a single-containe
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Additional resources• Deploy an A
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Figure 5-15. Simplified workflow wh
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CHAPTER 5Designing and DevelopingMu
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In this approach, each service (con
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Data sovereignty per microserviceIn
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Yet another drawback with this dire
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• Traditional N-Layered.• Domai
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Figure 6-5. Simple data-driven/CRUD
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Figure 6-7. Dependencies in a simpl
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Within the DbContext, you use the O
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});});// Changing default behavior
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Query string and URI versioning are
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Swashbuckle automatically generates
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Figure 6-9. Swashbuckle UI testing
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Basically, you define each of the c
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depends_on:- sqldataThis containeri
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Overriding the base docker-compose
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image: eshop/webmvc:${TAG:-latest}b
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webmvc:environment:- ASPNETCORE_ENV
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A Dockerfile like this will work. H
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environments so that you can easily
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pod}}}}return host;The following co
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You can directly run a Docker Redis
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you can research the forked eShopOn
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In Figure 6-20, you can see an abst
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Figure 6-21. RabbitMQ implementatio
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Each event type has a related chann
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}// ...In this case, since the orig
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• Publish the integration event r
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if (catalogItem == null) return Not
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The event handler needs to verify w
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Deduplicating messages when using R
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• Service tests. These tests ensu
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• Unit testing in .NET using dotn
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redis.data:ports:- "6379:6379"rabbi
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SignalR is one example of an artifa
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}finally{// Wait until the task com
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for these scenarios, like Azure Fun
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Sample microservices/containers to
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ports:- "5101:80" # Important: In a
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You install Ocelot and its dependen
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The main functionality of an Ocelot
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build:context: .dockerfile: src/Api
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Figure 6-36. Direct access to a mic
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Figure 6-39. Position of the Identi
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}}}//...Then, you also need to set
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exposes just a few services or endp
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Figure 7-1. External microservice a
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CQS is a simple concept: it is abou
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Therefore, you could use a differen
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definitions query the database and
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}}}LEFT JOIN[ordering].[orderstatus
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In the following image, you can see
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Layers in DDD microservicesMost ent
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Also, this aspect does not mean you
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The Domain Entity patternEntities r
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• Martin Fowler. The Anemic Domai
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Figure 7-9. Example of aggregates w
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Figure 7-10. Domain model structure
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Address = address;}// ...Additional
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Additionally, if there are differen
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The custom Entity base classThe fol
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Order Add(Order order);void Update(
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constructed, you must provide the r
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It could be argued that value objec
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}modelBuilder.ApplyConfiguration(ne
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• No inheritance-mapping support
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You can use this class as a type in
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for entity validation in EF Core (n
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because if you have a client applic
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Domain events versus integration ev
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As shown in Figure 7-15, starting f
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However, when the domain events cla
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Vaughn Vernon says the following in
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In code, you first need to register
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The reference app uses MediatR to p
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Figure 7-17. The relationship betwe
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object (as in EF when using the DbC
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Infrastructure in Entity Framework
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}get{}return _context;public BuyerR
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In short, custom repositories allow
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Fluent API and the OnModelCreating
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EF Core supports HiLo with the UseH
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}// return the result of the query
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worldwide, single-digit millisecond
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The ideal and more straightforward
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However, if you are planning to use
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[BsonId][BsonRepresentation(BsonTyp
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#Other environment variables for ad
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• Inversion of Control Containers
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foreach (var item in message.OrderI
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In the example code, the abstractio
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You send a command to a single rece
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data, and no behavior. The command
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IIdentityService identityService,IL
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Figure 7-25. Using the Mediator pat
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Additionally, async commands are on
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var requestCreateOrder = new Identi
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command);CommandHandler// Send the
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}}// Other types registration//...T
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RuleFor(command => command.City).No
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CHAPTER 7Implement resilientapplica
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Figure 8-2. The impact of having an
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certain failure scenarios faster th
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// Save product's data and publish
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available under heavy loads. That i
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In the above image, a ClientService
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A Typed Client is effectively a tra
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Add a jitter strategy to the retry
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In the code example above, the circ
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on. (Business message due to Circui
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In the previous code, the services.
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Figure 8-7. Custom Health Checks im
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Fortunately, AspNetCore.Diagnostics
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You can use simple custom applicati
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Directory or a dedicated authentica
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Authenticate with external provider
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To enable token authentication, ASP
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}services.AddSingleton<IClientStore
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About authorization in .NET microse
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The second AddPolicy call demonstra
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<PropertyGroup><UserSecretsId>Uniqu
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CHAPTER 9.NET MicroservicesArchitec
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NET-Microservices-Architecture-for-Containerized-NET-Applications

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