dotnet 9

Use it as a base image

Reference it in the FROM line of your Dockerfile. Nonroot, read-only root filesystem, built for amd64 and arm64.

FROM ghcr.io/quenchworks/images/dotnet:9

Or pull it directly

docker pull ghcr.io/quenchworks/images/dotnet:9

Version line

9

Latest line

8, 9, 10

Architectures

amd64, arm64

Runs as

nonroot (uid 1001)

Root filesystem

read-only

License

MIT

Verify the supply chain

This image is cosign-signed and carries an SPDX SBOM and a SLSA build-provenance attestation on the same digest. Check all three before you build on it:

# 1. signature — built and signed by QuenchWorks CI
cosign verify ghcr.io/quenchworks/images/dotnet:9 \
  --certificate-identity-regexp 'https://github.com/quenchworks/.+' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com

# 2. SLSA build provenance — which workflow built it, from what
gh attestation verify oci://ghcr.io/quenchworks/images/dotnet:9 --owner quenchworks

# 3. SPDX SBOM — the package inventory
gh attestation verify oci://ghcr.io/quenchworks/images/dotnet:9 --owner quenchworks \
  --predicate-type https://spdx.dev/Document

See the SBOM & provenance guide for reading the SBOM and using these checks in CI.

Best-practice Dockerfile for 9

Restore and dotnet publish in Release with the full SDK, then run the published output on the aspnet base for web apps. The SDK and the NuGet cache stay in the build stage.

1
# Build stage: restore, then publish the app.
2
FROM ghcr.io/quenchworks/images/dotnet:9 AS build
3
USER root
4
WORKDIR /src
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ENV NUGET_PACKAGES=/tmp/nuget \
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    DOTNET_CLI_TELEMETRY_OPTOUT=1
7

8
COPY ["App.csproj", "./"]
9
RUN ["dotnet", "restore", "App.csproj"]
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COPY . .
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RUN ["dotnet", "publish", "App.csproj", "-c", "Release", "-o", "/app/publish", "--no-restore"]
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# Runtime stage: ASP.NET Core runtime, nonroot.
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FROM ghcr.io/quenchworks/images/aspnet:9 AS runtime
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WORKDIR /app
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ENV ASPNETCORE_URLS=http://+:8080 \
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    DOTNET_CLI_TELEMETRY_OPTOUT=1
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COPY --from=build /app/publish ./
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USER 1001
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EXPOSE 8080
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ENTRYPOINT ["dotnet", "App.dll"]

This Dockerfile is pinned to the 9 line. For the line-by-line walkthrough and ecosystem variants (npm/Yarn, pip/uv/Poetry, Maven/Gradle), see the Build a .NET app guide.