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ASP.NET Core Runtime (Preview)

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dotnet/nightly/aspnet

By Microsoft

•Updated over 2 years ago

Preview images for the ASP.NET Core runtime

0

microsoft/dotnet-nightly-aspnet repository overview

Important: The images from the dotnet/nightly repositories include last-known-good (LKG) builds for the next release of .NET⁠.

See dotnet⁠ for images with official releases of .NET⁠.

⁠Featured Tags

  • 11.0 (Release Candidate)
    • docker pull mcr.microsoft.com/dotnet/nightly/aspnet:11.0
  • 10.0 (Long-Term Support)
    • docker pull mcr.microsoft.com/dotnet/nightly/aspnet:10.0
  • 9.0 (Standard Support)
    • docker pull mcr.microsoft.com/dotnet/nightly/aspnet:9.0
  • 8.0 (Long-Term Support)
    • docker pull mcr.microsoft.com/dotnet/nightly/aspnet:8.0

⁠About

This image contains the ASP.NET Core and .NET runtimes and libraries and is optimized for running ASP.NET Core apps in production.

Watch discussions⁠ for Docker-related .NET announcements.

⁠Usage

The .NET Docker samples⁠ show various ways to use .NET and Docker together. See Introduction to .NET and Docker⁠ and Host ASP.NET Core in Docker containers⁠ to learn more.

⁠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.

⁠Distroless images

.NET distroless container images⁠ contain only the minimal set of packages .NET needs, with everything else removed. Due to their limited set of packages, distroless containers have a minimized security attack surface, smaller deployment sizes, and faster start-up time compared to their non-distroless counterparts. They contain the following features:

  • Minimal set of packages required for .NET applications
  • Non-root user by default
  • No package manager
  • No shell

.NET offers distroless images for Azure Linux⁠ and Ubuntu (Chiseled)⁠.

⁠ASP.NET Core Composite Images

Starting from .NET 8, ASP.NET Core Composite images are optimized for performance using ReadyToRun (R2R) compilation⁠. For more information, see the composite images section in the Image Variants documentation⁠.

⁠Related Repositories

.NET:

.NET Framework:

⁠Full Tag Listing

View the current tags at the Microsoft Artifact Registry portal⁠ or on GitHub⁠.

⁠Support

⁠Lifecycle

⁠Image Update Policy

  • Base Image Updates: Images are re-built within 12 hours of any updates to their base images (e.g. debian:bookworm-slim, windows/nanoserver:ltsc2022, etc.).
  • .NET Releases: Images are re-built as part of releasing new .NET versions. This includes new major versions, minor versions, and servicing releases.
  • Critical CVEs: Images are re-built to pick up critical CVE fixes as described by the CVE Update Policy below.
  • Monthly Re-builds: Images are re-built monthly, typically on the second Tuesday of the month, in order to pick up lower-severity CVE fixes.
  • Out-Of-Band Updates: Images can sometimes be re-built when out-of-band updates are necessary to address critical issues. If this happens, new fixed version tags will be updated according to the Fixed version tags documentation⁠.
⁠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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⁠License

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