dotnet-runtime 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-runtime:9

Or pull it directly

docker pull ghcr.io/quenchworks/images/dotnet-runtime: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-runtime: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-runtime:9 --owner quenchworks

# 3. SPDX SBOM — the package inventory
gh attestation verify oci://ghcr.io/quenchworks/images/dotnet-runtime: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

dotnet-runtime is a runtime base you copy a published console or worker app onto, not something you build in. Here dotnet publish runs in an SDK build stage and the dotnet-runtime image is the final stage that runs it.

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# Build stage: restore and publish the worker/console app with the SDK.
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FROM ghcr.io/quenchworks/images/dotnet:9 AS build
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USER root
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WORKDIR /src
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ENV NUGET_PACKAGES=/tmp/nuget \
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    DOTNET_CLI_TELEMETRY_OPTOUT=1
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COPY ["Worker.csproj", "./"]
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RUN ["dotnet", "restore", "Worker.csproj"]
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COPY . .
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RUN ["dotnet", "publish", "Worker.csproj", "-c", "Release", "-o", "/app/publish", "--no-restore"]
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# This image is the final runtime stage: the plain .NET runtime, nonroot.
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FROM ghcr.io/quenchworks/images/dotnet-runtime:9 AS runtime
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WORKDIR /app
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COPY --from=build /app/publish ./
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USER 1001
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ENTRYPOINT ["dotnet", "Worker.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.