Docker - The framework microsoft.AspNetCore.App, version '3.1'0 was not found on build


I'm attempting to learn about docker and how to containerize a .NET core Web app. I've been following the tutorial below and have made good progress except when I actually run my project.


I built a .NET Core app in visual studio and am using .NET Core 3.1 and I (think) have verified all the correct .NET core versions are installed, but docker seems to think that nothing is there. My project builds correctly but when I attempt to run it, it barks at me that no .NET frameworks were found.

I'm new to docker and .NET core so I could definitely be missing something obvious so let me know if you have any suggestions! Thanks!

dotnet --info

.NET Core SDK (reflecting any global.json): Version: 3.1.101 Commit: b377529961 Runtime Environment: OS Name: Windows OS Version: 10.0.17763 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\3.1.101\ Host (useful for support): Version: 3.1.1 Commit: a1388f194c .NET Core SDKs installed: 3.0.102 [C:\Program Files\dotnet\sdk] 3.1.101 [C:\Program Files\dotnet\sdk] .NET Core runtimes installed: Microsoft.AspNetCore.All 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

docker pull mcr.microsoft.com/dotnet/core/runtime:3.1

3.1: Pulling from dotnet/core/runtime ee446884f7be: Already exists e60301a457d1: Already exists 9aa45ac596a4: Already exists a0172a0e2f05: Already exists 0e4e03cc72ce: Already exists d12a8fd361d3: Already exists Digest: sha256:1a314313bbfc550897fb760dc05c816f42e7f911c8bb8a4c9b5bde3cdad6ac76 Status: Downloaded newer image for mcr.microsoft.com/dotnet/core/runtime:3.1 mcr.microsoft.com/dotnet/core/runtime:3.1

docker build -t aspnetapp . Sending build context to Docker daemon 4.392MB

Step 1/10 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env ---> abe8d004f003 Step 2/10 : WORKDIR /app ---> Using cache ---> baf04998e0f5 Step 3/10 : COPY *.csproj ./ ---> Using cache ---> 57d5b8ce9b8b Step 4/10 : RUN dotnet restore ---> Using cache ---> 3a78664422c1 Step 5/10 : COPY . ./ ---> 7ad7515946be Step 6/10 : RUN dotnet publish -c Release -o out ---> Running in 7b9fd1655346 Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core Copyright (C) Microsoft Corporation. All rights reserved. Restore completed in 41.18 ms for C:\app\aspnetapp.csproj. aspnetapp -> C:\app\bin\Release\netcoreapp3.1\aspnetapp.dll aspnetapp -> C:\app\bin\Release\netcoreapp3.1\aspnetapp.Views.dll aspnetapp -> C:\app\out\ Removing intermediate container 7b9fd1655346 ---> df9351064b25 Step 7/10 : FROM mcr.microsoft.com/dotnet/core/runtime:3.1 ---> 96ec6546e277 Step 8/10 : WORKDIR /app ---> Running in 33e62d3940a5 Removing intermediate container 33e62d3940a5 ---> 0fe4ecf63895 Step 9/10 : COPY --from=build-env /app/out . ---> fe8793b4a38d Step 10/10 : ENTRYPOINT ["dotnet", "aspnetapp.dll"] ---> Running in a856a898d3f9 Removing intermediate container a856a898d3f9 ---> 4802cf9997df Successfully built 4802cf9997df Successfully tagged aspnetapp:latest


FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env WORKDIR /app # Copy csproj and restore as distinct layers COPY *.csproj ./ RUN dotnet restore # Copy everything else and build COPY . ./ RUN dotnet publish -c Release -o out # Build runtime image FROM mcr.microsoft.com/dotnet/core/runtime:3.1 WORKDIR /app COPY --from=build-env /app/out . ENTRYPOINT ["dotnet", "aspnetapp.dll"]

docker error

docker run -p 8080:80 --name myapp aspnetapp docker : It was not possible to find any compatible framework version At line:1 char:1 + docker run -p 8080:80 --name myapp aspnetapp + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (It was not poss...amework version:String) [], RemoteException + FullyQualifiedErrorId : NativeCommandError The framework 'Microsoft.AspNetCore.App', version '3.1.0' was not found. - No frameworks were found. You can resolve the problem by installing the specified framework and/or SDK. The specified framework can be found at: - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framework_version=3.1.0&arch=x64&rid=win10-x64


<Project Sdk="Microsoft.NET.Sdk.Web"> <PropertyGroup> <TargetFramework>netcoreapp3.1</TargetFramework> </PropertyGroup> </Project>

docker image -ls

REPOSITORY TAG IMAGE ID CREATED SIZE aspnetapp latest 4802cf9997df 14 minutes ago 326MB <none> <none> df9351064b25 14 minutes ago 748MB <none> <none> 05d5c7a53a75 18 minutes ago 748MB <none> <none> cfc51668b9c9 40 minutes ago 400MB <none> <none> c158d7286812 40 minutes ago 782MB <none> <none> 42135746c732 About an hour ago 400MB <none> <none> a898ac91a635 About an hour ago 748MB <none> <none> 6c73f17b1c56 2 hours ago 1.66GB <none> <none> bcdcd1874e78 2 hours ago 1.66GB myimage latest 1b4d8c7dffe4 3 hours ago 341MB mcr.microsoft.com/dotnet/core/samples aspnetapp 17070fe9e96c 8 days ago 346MB mcr.microsoft.com/dotnet/core/samples latest 425e8480ff0f 8 days ago 322MB hello-world latest 42514ac01c56 3 weeks ago 251MB mcr.microsoft.com/dotnet/core/sdk 3.1 abe8d004f003 3 weeks ago 731MB microsoft/dotnet sdk bd7379c04097 3 weeks ago 1.66GB mcr.microsoft.com/dotnet/core/aspnet 3.1 704413499629 3 weeks ago 341MB mcr.microsoft.com/dotnet/core/runtime 3.1 96ec6546e277 3 weeks ago 321MB microsoft/dotnet 2.1-aspnetcore-runtime 3c196369ffdc 3 weeks ago 395MB microsoft/dotnet aspnetcore-runtime 3c196369ffdc 3 weeks ago 395MB microsoft/dotnet 3.0-aspnetcore-runtime 04b08b1edcee 11 months ago 437MB

For ASP.NET Core you need the matching container image from mcr.microsoft.com/dotnet/core/aspnet. mcr.microsoft.com/dotnet/core/runtime doesn't have the extra ASP.NET Core pieces, it's only sufficient for .NET Core apps using the basic framework.


I solve this installing SDK for docker with PowerShell:

docker pull mcr.microsoft.com/dotnet/core/sdk:3.1

After that I change this lines of DockerFile in my project:

FROM mcr.microsoft.com/dotnet/core/aspnet:3.0-buster-slim AS base FROM mcr.microsoft.com/dotnet/core/sdk:3.0-buster AS build


FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build



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