DigitalOcean App Platform | ASP.NET CORE MVC APP | ERROR: Build Error: Non-Zero Exit

Posted on October 17, 2020

Here my Dockerfile:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /source

COPY mytestapp-Production-MVC.sln .
COPY mytestapp-Production-MVC/mytestapp-Production-MVC.csproj ./mytestapp-Production-MVC
COPY mytestapp-Production-MVC/ ./

# copy everything else and build app
# COPY mytestapp-Production-MVC/. ./source/mytestapp-Production-MVC
WORKDIR /source/mytestapp-Production-MVC
RUN dotnet restore
RUN dotnet publish -c release -o /app --no-restore

# final stage/image
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1
WORKDIR /app
COPY --from=build /app ./
EXPOSE 80
ENTRYPOINT ["dotnet", "mytestapp-Production-MVC.dll"]

I get the following ERROR:

mytestapp-production-mvc-live | 16:44:03 INFO[0032] Running: [/bin/sh -c dotnet restore]  
mytestapp-production-mvc-live | 16:44:46 error building image: error building stage: failed to execute command: starting command: fork/exec /bin/sh: not a directory
auerdev-production-mvc-live | 16:44:46 exit status 1

I hope someone can help.

Greetings, Sven

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Steven Normore

October 17, 2020

Accepted Answer

@smauer 👋

This is indeed a strange issue, especially since your Dockerfile looks very similar to our aspdotnet-sample, which is working as expected when I create an app from it.

It’s possible that there is a container layer caching issue happening for your app specifically. If you recreate your app, do you see the same error during build?