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dotnet-docker/README.md

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About

.NET is a general purpose development platform maintained by Microsoft and the .NET community on GitHub. It is cross-platform, supports Windows, macOS, and Linux, and can be used in device, cloud, and embedded/IoT scenarios.

.NET has several capabilities that make development productive, including automatic memory management, (runtime) generic types, reflection, asynchronous constructs, concurrency, and native interop. Millions of developers take advantage of these capabilities to efficiently build high-quality applications.

You can use C# or F# to write .NET apps.

  • C# is powerful, type-safe, and object-oriented while retaining the expressiveness and elegance of C-style languages. Anyone familiar with C and similar languages will find it straightforward to write in C#.
  • F# is a cross-platform, open-source, functional programming language for .NET. It also includes object-oriented and imperative programming.

.NET is open source (MIT and Apache 2 licenses) and was contributed to the .NET Foundation by Microsoft in 2014. It can be freely adopted by individuals and companies, including for personal, academic or commercial purposes. Multiple companies use .NET as part of apps, tools, new platforms and hosting services.

You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.

https://docs.microsoft.com/dotnet/core/

Watch discussions for Docker-related .NET announcements.

New: Ubuntu Chiseled Images

Ubuntu Chiseled .NET images are a type of "distroless" container image that contain only the minimal set of packages .NET needs, with everything else removed. These images offer dramatically smaller deployment sizes and attack surface by including only the minimal set of packages required to run .NET applications.

Please see the Ubuntu Chiseled + .NET documentation page for more info.

Usage

The .NET Docker samples show various ways to use .NET and Docker together. See Building Docker Images for .NET Applications to learn more.

Container sample: Run a simple application

You can quickly run a container with a pre-built .NET Docker image, based on the .NET console sample.

Type the following command to run a sample console application:

docker run --rm mcr.microsoft.com/dotnet/samples

Container sample: Run a web application

You can quickly run a container with a pre-built .NET Docker image, based on the ASP.NET Core sample.

Type the following command to run a sample web application:

docker run -it --rm -p 8000:8080 --name aspnetcore_sample mcr.microsoft.com/dotnet/samples:aspnetapp

After the application starts, navigate to http://localhost:8000 in your web browser. You can also view the ASP.NET Core site running in the container from another machine with a local IP address such as http://192.168.1.18:8000.

Note: ASP.NET Core apps (in official images) listen to port 8080 by default, starting with .NET 8. The -p argument in these examples maps host port 8000 to container port 8080 (host:container mapping). The container will not be accessible without this mapping. ASP.NET Core can be configured to listen on a different or additional port.

See Hosting ASP.NET Core Images with Docker over HTTPS to use HTTPS with this image.

Image Variants

.NET container images have several variants that offer different combinations of flexibility and deployment size. The Image Variants documentation contains a summary of the image variants and their use-cases.

Related Repositories

.NET:

.NET Framework:

Support

Lifecycle

Image Update Policy

  • We update supported .NET images within 12 hours of any updates to their base images (e.g. debian:bookworm-slim, windows/nanoserver:ltsc2022, etc.).
  • We re-build all .NET images as part of releasing new versions of .NET including new major/minor versions and servicing.
  • Distroless images such as Ubuntu Chiseled have no base image, and as such will only be updated with .NET releases and CVE fixes as described below.

CVE Update Policy

.NET container images are regularly monitored for the presence of CVEs. A given image will be rebuilt to pick up fixes for a CVE when:

  • We detect the image contains a CVE with a CVSS score of "Critical"
  • AND the CVE is in a package that is added in our Dockerfile layers (meaning the CVE is in a package we explicitly install or any transitive dependencies of those packages)
  • AND there is a CVE fix for the package available in the affected base image's package repository.

Please refer to the Security Policy and Container Vulnerability Workflow for more detail about what to do when a CVE is encountered in a .NET image.

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