Start Debugging

Tag: containers

6 posts

2026-09-12 dotnet-11 containers sdk

.NET 11 RC 1 Makes dotnet publish Container Images Reproducible

The .NET 11 RC 1 SDK honors SOURCE_DATE_EPOCH when publishing container images, strips the process id from layer tar headers, and skips blob uploads when the registry already has the manifest. Same commit in, same digest out.

2026-09-01 comparison dotnet dotnet-11

Framework-dependent vs self-contained vs Native AOT for a .NET 11 container image

Framework-dependent on a chiseled aspnet image is the right default for an ASP.NET Core service on .NET 11, because the runtime layer is shared across services and a runtime CVE is fixed by a base image bump. Self-contained trimmed and Native AOT buy a 2x to 5x smaller image and a much faster cold start, and cost you that. Real published sizes, the layer-sharing math, and the .NET 11 base image inference bug that breaks the AOT path.

2026-08-29 errors dotnet docker

Fix: failed to resolve source metadata for mcr.microsoft.com/dotnet/aspnet

BuildKit cannot read the manifest for your base image. Check the tag exists, repair the Docker credential helper, open both MCR endpoints, then pre-pull for offline builds.

2026-07-29 errors dotnet docker

Fix: Couldn't find a valid ICU package installed on the system in a .NET container

Your base image has no ICU. Either install icu-libs and icu-data-full, switch to an -extra image variant, or set InvariantGlobalization=true and accept ordinal-only string behavior.

2026-07-27 dotnet dotnet-11 csharp

How to publish a .NET 11 app as a container image with dotnet publish /t:PublishContainer

A complete guide to building container images from a .NET 11 app with no Dockerfile: the PublishContainer target, ContainerRepository and ContainerImageTags, base image selection through ContainerBaseImage and ContainerFamily, pushing to a registry and how authentication resolves, multi-arch OCI image indexes, the non-root default user, entrypoint control, tarball output for scanners, and the cases where you still need a Dockerfile.

2026-04-24 dotnet dotnet-10 ubuntu

.NET 10 on Ubuntu 26.04: resolute Container Tags and Native AOT in the Archive

Ubuntu 26.04 Resolute Raccoon ships with .NET 10 in the archive, introduces -resolute container tags to replace -noble, and packages Native AOT tooling via dotnet-sdk-aot-10.0.