Best practices for containerizing .net applications

Docker containerization can benefit both modern .NET applications and legacy ASP.NET applications built on .NET Framework 4.x, with Windows containers providing support for Windows-only workloads that organizations may not yet be ready to migrate. Using Visual Studio 2022 and Docker Desktop, developers can create projects with Docker support enabled or add a Dockerfile to existing Web Forms projects to build and run applications locally. The guidance emphasizes minimizing image size and attack surface by choosing slim base images, such as Windows Server Core or Nano Server for .NET Framework, and lightweight Linux images for newer .NET versions; multistage builds should use SDK images only during compilation and runtime images in production. An example .NET 6 application reduced its image size from 208 MB to 100 MB by adopting slimmer base images. Because outdated base images, libraries, and application code can introduce vulnerabilities, regular updates and image scanning are recommended, with Snyk CLI commands used to test and continuously monitor local container images; a sample image based on .NET Core 2.2 revealed 193 vulnerabilities.

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