.NET Framework Docker images support for Windows Server, version 20H2

[mthalman]

.NET Framework Docker images support for Windows Server, version 20H2

With the release of Windows Server, version 20H2on October 20, 2020, .NET Framework Docker images have been published for Server Core, version 20H2.

Details

• dotnet-framework-docker#655

.NET Framework tags containing the substring windowsservercore-20H2 are now available. You can find the full set of tags on Docker Hub.

.NET Framework multi-arch tags, such as 4.8, have been updated to use windowsservercore-20H2 images if your host is Windows Server, version 20H2 or higher.

Breaking Change: Default Shell

With this release, a change to the default shell was made compared to previous Windows versions. In previous versions, PowerShell was used as the default shell for the aspnet, sdk, and wcf images. In the 20H2 release and subsequent releases going forward, cmd will be used as the default shell. This change does not impact runtime images since they have always been set to use cmd as the shell.

This does not impact how a container is run. Rather, it impacts what shell is used to execute commands within a Dockerfile that is based on a 20H2 image. If the commands that you run in your Dockerfile expect the shell to be set to PowerShell and are impacted by this change, it is recommended that you add the following instruction to your Dockerfile before running such commands:

SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]

See #646 for more details on this change.

Impacted Repos

• dotnet/framework/aspnet: ASP.NET Runtime
• dotnet/framework/runtime: .NET Framework Runtime
• dotnet/framework/sdk: .NET Framework SDK
• dotnet/framework/wcf: Windows Communication Foundation
• dotnet/framework/samples: .NET Framework Samples