Dotnet Dockerfile

What it does

This skill generates optimized, multi-stage Dockerfiles for .NET applications. It determines the appropriate .NET version (8, 9, or 10) and project type (ASP.NET Core web app, API, worker service, or console app), then creates a Dockerfile tailored to your application's needs. You can choose between standard, "chiseled" (smaller image size), or Native AOT (smallest/fastest startup) optimization options for deployment. Note that .NET 10 uses Ubuntu as the default Linux distribution.

When to use it

• Creating Docker images for ASP.NET Core web applications, APIs, worker services, and console apps.
• Generating production-ready Dockerfiles with a smaller footprint using "chiseled" or Native AOT optimizations.
• Ensuring consistent environments across development, testing, and production deployments.
• Deploying .NET applications to containerized environments like Azure.

Key capabilities

• Automatically determines the .NET version (8, 9, or 10).
• Supports ASP.NET Core web apps, APIs, worker services, and console app project types.
• Generates multi-stage Dockerfiles for optimized image size and performance.
• Offers optimization choices: standard, chiseled, and Native AOT.
• Handles multi-project solutions by copying multiple .csproj files during the restore phase.
• Supports self-contained deployments which bundle the .NET runtime with the application.

Example prompts

• "Generate a Dockerfile for my ASP.NET Core web app project located at src/MyApp/MyApp.csproj."
• "Create a chiseled Dockerfile for my API project, using .NET 9."
• "Generate a self-contained Dockerfile for my console application."

Tips & gotchas

• The skill requires the location of your project file (e.g., src/MyApp/MyApp.csproj).
• .NET 10 uses Ubuntu as the default Linux distribution, replacing previous Debian images.
• "Chiseled" images are recommended for production environments due to their smaller size and security benefits (no shell or package manager, non-root user).