Cannot build Dockerfile

Stack Overflow Asked by user1765862 on December 14, 2020

Folder structure:



    WORKDIR /app 
    # copy csproj and restore as distinct layers
    COPY ./Honda.Domain/Honda.Domain.csproj ./Honda.Domain/
    COPY ./Honda.API/Honda.API.csproj Honda.API/
    RUN dotnet restore Honda.API/Honda.API.csproj
    # copy everything else and build app
    COPY . ./
    WORKDIR /app/Honda.API/
    RUN dotnet publish -c Release -o publish/
    WORKDIR /app
    COPY --from=build /app/Honda.API/publish  .
    ENV ASPNETCORE_URLS=https://+:5001;http://+:5000 
    ENTRYPOINT ["dotnet", "Honda.API.dll"]

Trying to build using command:

docker build -t honda-api:build .

Step 17/19 : COPY –from=build /app/Honda.API/publish .

invalid from flag value build: pull access denied for build,
repository does not exist or may require ‘docker login’: denied:
requested access to the resource is denied

One Answer

You are using the --from flag which is supposed to copy something from a previous stage build.

Optionally COPY accepts a flag --from=<name> that can be used to set the source location to a previous build stage (created with FROM .. AS <name>) that will be used instead of a build context sent by the user. In case a build stage with a specified name can’t be found an image with the same name is attempted to be used instead.

Read here first about multi stage builds:

If this is what you are trying to achieve you should modify your first line to be like: FROM as build

Correct answer by J-Mous on December 14, 2020

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