An audit of container images against the .NET supported OS matrix found several stale or EOL OS versions with Dockerfiles that should be cleaned up, and an upcoming Fedora release that should be provisioned.

See OS onboarding guide for context. Part of .NET OS Support Tracking. Related runtime tracking issue: dotnet/runtime#125690.

Tracking

EOL — remove

• Debian 11 — EOL June 2024

Approaching EOL — plan removal

• openSUSE Leap 15.6 (EOL 2026-04-30)
• Alpine 3.21, 3.22 — consolidate to just 3.23 + edge

New — provision ahead of need

• Fedora 44 — add images ahead of Fedora 43 EOL (2026-11)

Details

Debian 11 (EOL)

https://github.com/dotnet/dotnet-buildtools-prereqs-docker/blob/f8480467d18eec67b5bad9f6a26c859ac7755b1d/src/debian/11/helix/Dockerfile

openSUSE Leap 15.6 (EOL 2026-04-30)

https://github.com/dotnet/dotnet-buildtools-prereqs-docker/blob/f8480467d18eec67b5bad9f6a26c859ac7755b1d/src/opensuse/15.6/helix/Dockerfile

Alpine 3.21, 3.22 — stale

Runtime main only references Alpine 3.23 + edge. Older images can be removed.

https://github.com/dotnet/dotnet-buildtools-prereqs-docker/blob/f8480467d18eec67b5bad9f6a26c859ac7755b1d/src/alpine/3.21/helix/Dockerfile

https://github.com/dotnet/dotnet-buildtools-prereqs-docker/blob/f8480467d18eec67b5bad9f6a26c859ac7755b1d/src/alpine/3.22/helix/Dockerfile

Fedora 44 — new

Fedora 43 images exist (use as template for 44). Fedora 44 should be provisioned proactively so images are ready before Fedora 43 reaches EOL.

https://github.com/dotnet/dotnet-buildtools-prereqs-docker/blob/f8480467d18eec67b5bad9f6a26c859ac7755b1d/src/fedora/43/helix/Dockerfile

This issue was generated by GitHub Copilot CLI v1.0.7 via the update-supported-os skill.