Develop Reference

Error in dotnet restore in executing a docker build in project .net 6 use layers

I'm trying executing a "docker build" in my application .Net 6.0, but I receive an error in Dotnet restore in Dockerfile.
The application executing normally local, not any error.
Docker command:
docker build -t aspnetcore-docker-image .
Error in terminal:
=> ERROR [build 7/9] RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj 0.2s
------
> [build 7/9] RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj:
#11 0.185 Could not execute because the application was not found or a compatible .NET SDK is not installed.
#11 0.185 Possible reasons for this include:
#11 0.185 * You intended to execute a .NET program:
#11 0.185 The application 'restore' does not exist.
#11 0.185 * You intended to execute a .NET SDK command:
#11 0.185 It was not possible to find any installed .NET SDKs.
#11 0.185 Install a .NET SDK from:
#11 0.185 https://aka.ms/dotnet-download
------
executor failed running [/bin/sh -c dotnet restore ./DevFreela.API/DevFreela.API.csproj]: exit code: 145
My Dockerfile
# .NET Core SDK
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS build
# Sets the working directory
WORKDIR /app
# Copy Projects
#COPY *.sln .
COPY Src/DevFreela.API/DevFreela.API.csproj ./DevFreela.API/
COPY Src/DevFreela.Application/DevFreela.Application.csproj ./DevFreela.Application/
COPY Src/DevFreela.Core/DevFreela.Core.csproj ./DevFreela.Core/
COPY Src/DevFreela.Infrastructure/DevFreela.Infrastructure.csproj ./DevFreela.Infrastructure/
# .NET Core Restore
RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj
# Copy All Files
COPY Src ./
# .NET Core Build and Publish
RUN dotnet publish ./DevFreela.Api/DevFreela.Api.csproj -c Release -o /publish
# ASP.NET Core Runtime
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS runtime
WORKDIR /app
COPY --from=build /publish ./
EXPOSE 80 5195 7066
ENV ASPNETCORE_URLS=http://+:5195;https://+:7066
ENTRYPOINT ["dotnet", "DevFreela.API.dll"]
Project structure:
Complete terminal log:
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 938B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 35B 0.0s
=> [internal] load metadata for mcr.microsoft.com/dotnet/aspnet:6.0 0.6s
=> [internal] load build context 0.0s
=> => transferring context: 13.14kB 0.0s
=> [runtime 1/3] FROM mcr.microsoft.com/dotnet/aspnet:6.0#sha256:26ef9dc4aa354cc4aa4ae533c97f92d0d72c5e848f6968660be51d9 0.0s
=> CACHED [runtime 2/3] WORKDIR /app 0.0s
=> CACHED [build 3/9] COPY Src/DevFreela.API/DevFreela.API.csproj ./DevFreela.API/ 0.0s
=> CACHED [build 4/9] COPY Src/DevFreela.Application/DevFreela.Application.csproj ./DevFreela.Application/ 0.0s
=> CACHED [build 5/9] COPY Src/DevFreela.Core/DevFreela.Core.csproj ./DevFreela.Core/ 0.0s
=> CACHED [build 6/9] COPY Src/DevFreela.Infrastructure/DevFreela.Infrastructure.csproj ./DevFreela.Infrastructure/ 0.0s
=> ERROR [build 7/9] RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj 0.2s
------
> [build 7/9] RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj:
#11 0.185 Could not execute because the application was not found or a compatible .NET SDK is not installed.
#11 0.185 Possible reasons for this include:
#11 0.185 * You intended to execute a .NET program:
#11 0.185 The application 'restore' does not exist.
#11 0.185 * You intended to execute a .NET SDK command:
#11 0.185 It was not possible to find any installed .NET SDKs.
#11 0.185 Install a .NET SDK from:
#11 0.185 https://aka.ms/dotnet-download
------
executor failed running [/bin/sh -c dotnet restore ./DevFreela.API/DevFreela.API.csproj]: exit code: 145

You're using the aspnet image which doesn't contain the SDK, so you can't build using that. You need the sdk image for the first part of your Dockerfile like this
# .NET Core SDK
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
# Sets the working directory
WORKDIR /app
# Copy Projects
#COPY *.sln .
COPY Src/DevFreela.API/DevFreela.API.csproj ./DevFreela.API/
COPY Src/DevFreela.Application/DevFreela.Application.csproj ./DevFreela.Application/
COPY Src/DevFreela.Core/DevFreela.Core.csproj ./DevFreela.Core/
COPY Src/DevFreela.Infrastructure/DevFreela.Infrastructure.csproj ./DevFreela.Infrastructure/
# .NET Core Restore
RUN dotnet restore ./DevFreela.API/DevFreela.API.csproj
# Copy All Files
COPY Src ./
# .NET Core Build and Publish
RUN dotnet publish ./DevFreela.Api/DevFreela.Api.csproj -c Release -o /publish
# ASP.NET Core Runtime
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS runtime
WORKDIR /app
COPY --from=build /publish ./
EXPOSE 80 5195 7066
ENV ASPNETCORE_URLS=http://+:5195;https://+:7066
ENTRYPOINT ["dotnet", "DevFreela.API.dll"]

Buiding a Docker image with a external project reference (outside solution)

I'm having trouble building a Docker Image of my project. In my project I have a project reference from an application, which is not in the same solution as my project. When I try to build my Docker image I get the following errors/warnings:
PS C:\Trunk\Tools\Dashboard> docker build -f Server/Dockerfile --force-rm -t dashboardserver .
[+] Building 228.2s (15/17)
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 579B 0.1s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 35B 0.0s
=> [internal] load metadata for mcr.microsoft.com/dotnet/sdk:6.0 0.9s
=> [internal] load metadata for mcr.microsoft.com/dotnet/aspnet:6.0 0.0s
=> [base 1/2] FROM mcr.microsoft.com/dotnet/aspnet:6.0 0.0s
=> [build 1/7] FROM mcr.microsoft.com/dotnet/sdk:6.0#sha256:a2a8f968b043349b8faa0625c5405ac33da70b3274ff9e17109430f16aa9a3ee 0.0s
=> [internal] load build context 2.2s
=> => transferring context: 1.32MB 2.2s
=> CACHED [base 2/2] WORKDIR /app 0.0s
=> CACHED [final 1/2] WORKDIR /app 0.0s
=> CACHED [build 2/7] WORKDIR /src 0.0s
=> CACHED [build 3/7] COPY [Server/Server.csproj, Server/] 0.0s
=> [build 4/7] RUN dotnet restore "Server/Server.csproj" 94.6s
=> [build 5/7] COPY . . 0.2s
=> [build 6/7] WORKDIR /src/Server 0.2s
=> ERROR [build 7/7] RUN dotnet build "Server.csproj" -c Release -o /app/build 102.3s
------
> [build 7/7] RUN dotnet build "Server.csproj" -c Release -o /app/build:
#15 3.459 Microsoft (R) Build Engine version 17.1.0+ae57d105c for .NET
#15 3.459 Copyright (C) Microsoft Corporation. All rights reserved.
#15 3.459
#15 4.336 Determining projects to restore...
#15 4.341 Skipping project "/SomeApp/Api/SomeApp.Api.csproj" because it was not found.
#15 4.343 Skipping project "/SomeApp/Api/SomeApp.Api.csproj" because it was not found.
#15 4.729 All projects are up-to-date for restore.
#15 5.139 /usr/share/dotnet/sdk/6.0.201/Microsoft.Common.CurrentVersion.targets(2065,5): warning : The referenced project '../../../SomeApp/Api/SomeApp.Api.csproj' does not exist. [/src/Server/Server.csproj]
#15 97.00 /src/Server/Program.cs(9,7): error CS0246: The type or namespace name 'SomeApp' could not be found (are you missing a using directive or an assembly reference?) [/src/Server/Server.csproj]
#15 98.57
#15 98.57 Build FAILED.
#15 98.57
#15 98.57 /usr/share/dotnet/sdk/6.0.201/Microsoft.Common.CurrentVersion.targets(2065,5): warning : The referenced project '../../../SomeApp/Api/SomeApp.Api.csproj' does not exist. [/src/Server/Server.csproj]
#15 98.57 /src/Server/Program.cs(9,7): error CS0246: The type or namespace name 'SomeApp' could not be found (are you missing a using directive or an assembly reference?) [/src/Server/Server.csproj]
#15 98.57 1 Warning(s)
#15 98.57 1 Error(s)
#15 98.57
#15 98.57 Time Elapsed 00:01:35.02
------
executor failed running [/bin/sh -c dotnet build "Server.csproj" -c Release -o /app/build]: exit code: 1
The Dockerfile which is used:
FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["Server/Server.csproj", "Server/"]
RUN dotnet restore "Server/Server.csproj"
COPY . .
WORKDIR "/src/Server"
RUN dotnet build "Server.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "Server.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Server.dll"]
EXPOSE 5004
The directory looks as follows:
\Trunk\Tools\Dashboard (my application with its own solution)
\Trunk\SomeApp (other application with its own solution)
+- SomeApp.sln
+- Api ("project" folder)
+- SomeApp.Api.csproj
Project reference in dashboard.sln:
<ItemGroup>
<ProjectReference Include="..\..\..\SomeApp\Api\SomeApp.Api.csproj" />
</ItemGroup>
I tried to build a Docker image of my application, and I expected to get a Docker image, so I could build a Docker container. I totally get that it can't find the 'SomeApp' application, because I'm not pushing it to the Docker image. But how could I solve this problem?
(Edit: removed unreadable JPG and added cmd lines. Also added Dockerfile, which is used at the moment. For the minimal reproducible example there are two project solutions needed, with the same file structure as shown above. )

Builiding Dockerfile succeed on Mac M1, fails on Windows 10 WSL 2

containerizing an app that I did in the past, I started working on my Mac M1 and created the following Dockerfile (as you'll see, very very simple one):
FROM mcr.microsoft.com/dotnet/sdk:6.0
COPY *.csproj ./
RUN dotnet restore
COPY ../*.cs ./
COPY ../Properties ./
RUN dotnet publish -c Release
FROM mcr.microsoft.com/dotnet/runtime:6.0
COPY ./bin/Release/net6.0/publish app/
WORKDIR /app
ENTRYPOINT ["dotnet", "app.dll"]
Launching the simplest
docker build -t counter-image -f Dockerfile .
It works perfectly in MacM1, fails in Windows 10.
When I run docker build -t counter-image -f Dockerfile .
#1 [internal] load build definition from Dockerfile
#1 sha256:a5c8a0c34c743f255ebdc15d65bfbbe5094a37db3462015427300b5d8afdb80e
#1 transferring dockerfile: 403B done
#1 DONE 0.1s
#2 [internal] load .dockerignore
#2 sha256:dc1169a26a22674179859bc7bb3820723365424bb8804c7917733b3b74ec5d65
#2 transferring context: 2B done
#2 DONE 0.1s
#3 [internal] load metadata for mcr.microsoft.com/dotnet/runtime:6.0
#3 sha256:0128d5218b10a50bf55970db7c113f09503205e2b2ada4931bb5d0c6628fdd2a
#3 DONE 1.2s
#5 [internal] load build context
#5 sha256:0f49ce22f840bcf956513309e49cda3c26b83cb92b6e3f539b463beb14fb36e7
#5 DONE 0.0s
#4 [stage-1 1/3] FROM mcr.microsoft.com/dotnet/runtime:6.0#sha256:dbf2ee47aeb7cc078d1351ef961913296d9044db8928b3d1cbb88d7d3e87cccb
#4 sha256:2aacc73d23873adb384695e176a97f35524a7a10087c170e336161af3a1b4ce3
#4 resolve mcr.microsoft.com/dotnet/runtime:6.0#sha256:dbf2ee47aeb7cc078d1351ef961913296d9044db8928b3d1cbb88d7d3e87cccb
0.1s done
#4 sha256:dbf2ee47aeb7cc078d1351ef961913296d9044db8928b3d1cbb88d7d3e87cccb
2.17kB / 2.17kB done
#4 sha256:b534d6bba13c1654a13497dfcb04ad0b398772b5d1da0e5bec5e0a3e38e15ccb
1.16kB / 1.16kB done
#4 sha256:8b872fde0fc7d2e58dd4f04ad53f21d27043640978dd7730add604f9b58ed207
2.80kB / 2.80kB done
#4 CANCELED
#5 [internal] load build context
#5 sha256:0f49ce22f840bcf956513309e49cda3c26b83cb92b6e3f539b463beb14fb36e7
#5 transferring context: 25B done
#5 DONE 0.1s
#6 [stage-1 2/3] COPY ./bin/Release/net6.0/publish MindsphereConfigurationMover/
#6 sha256:434ed7ed1150d04fac20d05feeb2d63aa5bdcf9cf63821709aa8091d48422119
#6 ERROR: "/bin/Release/net6.0/publish" not found: not found
[stage-1 2/3] COPY ./bin/Release/net6.0/publish MindsphereConfigurationMover/:
------ failed to compute cache key: "/bin/Release/net6.0/publish" not found: not found
It looks like it cannot get the sdk/runtime so the following publish fails, but it makes little sense to me.
Any suggestion?

I'm guessing that you're expecting the COPY ./bin/Release/net6.0/publish app/ line to copy the published app from the project that was built earlier on in the Dockerfile. But that's not what it's actually doing. It's attempting to copy from the bin/Release/net6.0/publish of your local file system (your build context location), outside of the container. So, likely, this directory exists on your M1 Mac but not your Windows machine.
The reason it's attempting to copy from the local file system is because you've not indicated in the COPY instruction that it should copy from a Dockerfile stage. This can be done with the following syntax: COPY --from=<stage-name> <source-path> <destination-path>. In order to reference a stage name, you need to declare the stage name as well which also hasn't been done in this Dockerfile. The stage you would want to reference is that the one using the sdk image.
Here's the suggested Dockerfile to use:
FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
COPY *.csproj ./
RUN dotnet restore
COPY ../*.cs ./
COPY ../Properties ./
RUN dotnet publish -c Release -o /app
FROM mcr.microsoft.com/dotnet/runtime:6.0
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["dotnet", "app.dll"]
You can see .NET Dockerfiles that demonstrate this pattern at https://github.com/dotnet/dotnet-docker/tree/main/samples.

Why does my dotnet restore step fail in my dockerfile?

I've generated a basic Kubernetes Web Application in Visual Studio 2019, v16.11.1, which allowed me to automatically generate a Dockerfile and start debugging. However, upon switching to a Release configuration, the build fails when the internal dotnet restore command executes. Apparently upon trying to pull Nuget packages from a feed, the dotnet restore rejects the SSL certificate provided by the Nuget feed server.
My question is, what am I doing wrong? I started with literally the default web application program generated by Visual Studio, and it automatically fails when I try to build a Release config. See here for more detail:
The Issue
The following Dockerfile can be built in a debug configuration, but not in a Release configuration.
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY ["KubernetesWebApp/KubernetesWebApp.csproj", "KubernetesWebApp/"]
RUN dotnet restore "KubernetesWebApp/KubernetesWebApp.csproj"
COPY . .
WORKDIR "/src/KubernetesWebApp"
RUN dotnet build "KubernetesWebApp.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "KubernetesWebApp.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "KubernetesWebApp.dll"]
Clicking "Debug" to start a debug session executes the following build, and I can debug the application:
docker build -f ".\KubernetesWebApp\Dockerfile" --force-rm -t kuberneteswebapp:dev --target base --label "com.microsoft.created-by=visual-studio" --label "com.microsoft.visual-studio.project-name=KubernetesWebApp" .
However, upon attempting the following build command, the dotnet restore command fails due to a remote SSL certificate check failure:
docker build -t kuberneteswebapp:latest -f KubernetesWebApp/Dockerfile .
This elicits the following error:
[+] Building 7.7s (12/17)
=> [internal] load build definition from Dockerfile 0.4s
=> => transferring dockerfile: 32B 0.2s
=> [internal] load .dockerignore 0.3s
=> => transferring context: 35B 0.0s
=> [internal] load metadata for mcr.microsoft.com/dotnet/core/aspnet:3.1 0.8s
=> [internal] load metadata for mcr.microsoft.com/dotnet/core/sdk:3.1 0.8s
=> [internal] load build context 0.3s
=> => transferring context: 644B 0.1s
=> [build 1/7] FROM mcr.microsoft.com/dotnet/core/sdk:3.1#sha256:aa984bf37de864afe9f34bc80e42412dd95702b94731a481821eeae364df77ae 0.2s
=> => resolve mcr.microsoft.com/dotnet/core/sdk:3.1#sha256:aa984bf37de864afe9f34bc80e42412dd95702b94731a481821eeae364df77ae 0.2s
=> [base 1/2] FROM mcr.microsoft.com/dotnet/core/aspnet:3.1#sha256:9280563285e34929fdae56b8759d8050169b3ce125a5dced64945b3b51e79918 0.3s
=> => resolve mcr.microsoft.com/dotnet/core/aspnet:3.1#sha256:9280563285e34929fdae56b8759d8050169b3ce125a5dced64945b3b51e79918 0.3s
=> CACHED [base 2/2] WORKDIR /app 0.0s
=> CACHED [final 1/2] WORKDIR /app 0.0s
=> CACHED [build 2/7] WORKDIR /src 0.0s
=> CACHED [build 3/7] COPY [KubernetesWebApp/KubernetesWebApp.csproj, KubernetesWebApp/] 0.0s
=> ERROR [build 4/7] RUN dotnet restore "KubernetesWebApp/KubernetesWebApp.csproj" 5.5s
------
> [build 4/7] RUN dotnet restore "KubernetesWebApp/KubernetesWebApp.csproj":
#12 3.363 Determining projects to restore...
#12 5.397 /usr/share/dotnet/sdk/3.1.412/NuGet.targets(128,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json. [/src/KubernetesWebApp/KubernetesWebApp.csproj]
#12 5.397 /usr/share/dotnet/sdk/3.1.412/NuGet.targets(128,5): error : The SSL connection could not be established, see inner exception. [/src/KubernetesWebApp/KubernetesWebApp.csproj]
#12 5.397 /usr/share/dotnet/sdk/3.1.412/NuGet.targets(128,5): error : The remote certificate is invalid according to the validation procedure. [/src/KubernetesWebApp/KubernetesWebApp.csproj]
------
executor failed running [/bin/sh -c dotnet restore "KubernetesWebApp/KubernetesWebApp.csproj"]: exit code: 1
What I Think the Problem Is
I think the issue arises when :
The docker container attempts to pull Nuget packages from a nuget feed,
During identity verification it checks the provided server certificate
Due to some specified validation procedure, the server certificate fails verification.
What I've Tried to Fix It
I've tried the following commands to force the application to download new base container images, but to no avail:
Attempt 1:
docker build --no-cache --pull -t kuberneteswebapp:latest -f KubernetesWebApp/Dockerfile .
Result: Same error as before
Attempt 2:
docker system prune
docker image prune -a
docker build --no-cache --pull -t kuberneteswebapp:latest -f KubernetesWebApp/Dockerfile .
result: Same error as before
Neither of these efforts have succeeded. Can anyone help me? I'm at a loss here.

The issue fixed itself. I just reattempted both my test and actual projects and it works now. This could have been a software update or a computer restart. But everything works now.

If you are using Windows containers, I recommend switching to a Linux container and trying it out again. (You can do so by right clicking the Docker desktop icon in the system tray bar).
I came across the following issue on GitHub: https://github.com/docker/for-win/issues/2760#issuecomment-430889666 I was unable to reproduce your issue with a fresh ASP .NET Web API

Develop IoT Edge modules for Windows devices Tutorial Build Error

I have followed all the steps in the tutorial Tutorial: Develop IoT Edge modules for Windows devices
I have signed into docker desktop.
However when I try and build and publish I get the following error in the output window
> DOCKER_HOST:
DOCKER_TLS_VERIFY:
DOCKER_CERT_PATH:
Additional Env Variables:
------ Build and Push IoT Edge Modules started: Platform: Windows Amd64, Configuration: Release ------
The deployment manifest is generated at C:\Users\bar\source\repos\AzureIotEdgeApp3\config\deployment.windows-amd64.json
docker build --rm -f "C:\Users\bar\source\repos\IotEdgeModule3\Dockerfile.windows-amd64" -t FOO.azurecr.io/iotedgemodule3:0.0.1-windows-amd64 "C:\Users\bar\source\repos\IotEdgeModule3"
#2 (internal) load .dockerignore
#2 transferring context: 2B done
#2 DONE 0.1s
#1 (internal) load build definition from Dockerfile.windows-amd64
#1 transferring dockerfile: 46B 0.0s done
#1 DONE 0.1s
#3 (internal) load metadata for mcr.microsoft.com/dotnet/core/runtime:3.1-n...
#3 DONE 0.0s
#4 (internal) load metadata for mcr.microsoft.com/dotnet/core/sdk:3.1-nanos...
#4 DONE 0.0s
#5 (stage-1 1/3) FROM mcr.microsoft.com/dotnet/core/runtime:3.1-nanoserver-...
#5 CACHED
#9 (internal) load build context
#9 transferring context: 1.20kB 0.0s done
#9 DONE 0.2s
#6 (stage-1 2/3) WORKDIR /app
#6 ERROR: open /var/lib/docker/overlay2/78d2cb8633edf0eef3af53faff16f4b1570ca332555085bcadcb185c037611dd/merged/etc/passwd: no such file or directory
#7 (build-env 1/6) FROM mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-18...
#7 resolve mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-1809#sha256:aeab6d06ece872b88e59c4da0a98aa64e637aa979a161923658c5f7ef74b9699 done
#7 sha256:918abb37d3f2ac5ee5f9ad3d2017bebcdc353838e7097f5be7fda8c7df590489 4.36kB / 4.36kB done
#7 sha256:aeab6d06ece872b88e59c4da0a98aa64e637aa979a161923658c5f7ef74b9699 3.43kB / 3.43kB done
#7 CANCELED
> (stage-1 2/3) WORKDIR /app:
failed to solve with frontend dockerfile.v0: failed to build LLB: open /var/lib/docker/overlay2/78d2cb8633edf0eef3af53faff16f4b1570ca332555085bcadcb185c037611dd/merged/etc/passwd: no such file or directory
(ERROR): Build docker image failed: #2 (internal) load .dockerignore
#2 transferring context: 2B done
#2 DONE 0.1s
#1 (internal) load build definition from Dockerfile.windows-amd64
#1 transferring dockerfile: 46B 0.0s done
#1 DONE 0.1s
#3 (internal) load metadata for mcr.microsoft.com/dotnet/core/runtime:3.1-n...
#3 DONE 0.0s
#4 (internal) load metadata for mcr.microsoft.com/dotnet/core/sdk:3.1-nanos...
#4 DONE 0.0s
#5 (stage-1 1/3) FROM mcr.microsoft.com/dotnet/core/runtime:3.1-nanoserver-...
#5 CACHED
#9 (internal) load build context
#9 transferring context: 1.20kB 0.0s done
#9 DONE 0.2s
#6 (stage-1 2/3) WORKDIR /app
#6 ERROR: open /var/lib/docker/overlay2/78d2cb8633edf0eef3af53faff16f4b1570ca332555085bcadcb185c037611dd/merged/etc/passwd: no such file or directory
#7 (build-env 1/6) FROM mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-18...
#7 resolve mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-1809#sha256:aeab6d06ece872b88e59c4da0a98aa64e637aa979a161923658c5f7ef74b9699 done
#7 sha256:918abb37d3f2ac5ee5f9ad3d2017bebcdc353838e7097f5be7fda8c7df590489 4.36kB / 4.36kB done
#7 sha256:aeab6d06ece872b88e59c4da0a98aa64e637aa979a161923658c5f7ef74b9699 3.43kB / 3.43kB done
#7 CANCELED
> (stage-1 2/3) WORKDIR /app:
failed to solve with frontend dockerfile.v0: failed to build LLB: open /var/lib/docker/overlay2/78d2cb8633edf0eef3af53faff16f4b1570ca332555085bcadcb185c037611dd/merged/etc/passwd: no such file or directory
I am trying this on a Windows 10 Pro, x64 computer with latest version of Visual studio Version 16.8.0 and Docker Windows Desktop (stable) installed yesterday.
I have tried reinstalling docker and creating the visual studio projects, however I still get the same error.
this is docker file Dockerfile.windows-amd64:
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-nanoserver-1809 AS build-env
WORKDIR /app
COPY *.csproj ./
RUN dotnet restore
COPY . ./
RUN dotnet publish -c Release -o out
FROM mcr.microsoft.com/dotnet/core/runtime:3.1-nanoserver-1809
WORKDIR /app
COPY --from=build-env /app/out ./
ENTRYPOINT ["dotnet", "IotEdgeModule3.dll"]

Kgalic is correct, I Docker was running using Linux by Default. I switched to Windows by using the context menu on the docker icon in the system try.