Outdated Dockerfile

[EmilCataranciuc]

Type of issue

Other (describe below)

Description

As per the latest official documentation for the following Dockerfile command:
# Build and publish a release
RUN dotnet publish -c Release -o out

.NET 7.0.200 SDK and later
If you specify the --output option when running this command on a solution, the CLI will emit a warning (an error in 7.0.200) due to the unclear semantics of the output path. The --output option is disallowed because all outputs of all built projects would be copied into the specified directory, which isn't compatible with multi-targeted projects, as well as projects that have different versions of direct and transitive dependencies. For more information, see Solution-level --output option no longer valid for build-related commands.

According to the relevant linked article the "Recommended action" is to remove the -o (--output) option and replace
COPY --from=build-env /App/out .

with

COPY --from=build-env /App/bin/[configuration]/[framework]/[runtime]/publish/ .

Page URL

https://learn.microsoft.com/en-us/dotnet/core/docker/build-container?tabs=linux&pivots=dotnet-8-0

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/docker/build-container.md

Document Version Independent Id

58d57b81-4ca6-6536-8788-f212402b41a7

Article author

@IEvangelist

Metadata

• ID: 4c7470d2-9a57-7654-e13a-4f912898f7aa
• Service: dotnet-fundamentals
• Sub-service: dotnet-docker

Related Issues

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Associated WorkItem - 360317