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Welcome to this module of our Azure Kubernetes Service (AKS) course. In this lesson, you’ll learn how to:
  • Scaffold and run a simple ASP.NET Core Razor Pages application
  • Containerize the app using Docker Desktop
  • Optionally pull a pre-built image from Docker Hub
The Docker image you build here will be deployed to Azure in a later lesson.

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Prerequisites

Make sure you have the following installed:
PrerequisiteDescription
.NET 6 SDKDownload from Microsoft .NET
Docker DesktopInstall via Docker Desktop
Code EditorVisual Studio Code, Visual Studio, or any editor of your choice
Ensure Docker Desktop is running before you build or pull any images.

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1. Creating the ASP.NET Core Application

We’ll scaffold a basic Razor Pages app and review the IndexModel class. Create a new project and replace the contents of Pages/Index.cshtml.cs with: 
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.Extensions.Logging;

namespace KodeKloudApp.Pages
{
    public class IndexModel : PageModel
    {
        private readonly ILogger<IndexModel> _logger;

        public IndexModel(ILogger<IndexModel> logger)
        {
            _logger = logger;
        }

        public void OnGet()
        {
        }
    }
}
This minimal page model logs requests and serves the Razor Page on HTTP GET.

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2. Containerizing with Docker

At the root of your ASP.NET project, add a Dockerfile similar to: 
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY . .
RUN dotnet restore
RUN dotnet publish -c Release -o /app

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS runtime
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["dotnet", "KodeKloudApp.dll"]
Build the Docker image: 
docker build -t yourrepo/kodekloudapp:latest .
A successful build will output stages like: 
[+] Building 12.4s (5/17)
 => CACHED [build 1/7] FROM mcr.microsoft.com/dotnet/sdk:6.0 ...
 => [build 3/7] COPY . .
 => [build 4/7] RUN dotnet restore
 => [build 5/7] RUN dotnet build
 => [build 6/7] RUN dotnet publish
[base 1/2] FROM mcr.microsoft.com/dotnet/aspnet:6.0 ...
...
Dockerfile StagePurpose
buildRestores, builds, and publishes the app
runtimeHosts the compiled app
After completion, you’ll have an image tagged yourrepo/kodekloudapp:latest.

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3. Using a Pre-built Image (Optional)

If you’d rather skip local builds, pull the image directly from Docker Hub: 
docker pull yourrepo/kodekloudapp:latest
You can browse Docker Hub and search for yourrepo/kodekloudapp to verify the image and get the exact pull command.

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References

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