Error while running the ASP.NET Core WebApp on Docker in Windows 7 (Debugging)

Question

I am trying to run the asp.net core app on docker in windows 7. I have Visual Studio 2015 Enterprise (Update 3) and Visual Studio Tools for Docker installed. Also, I am able to run the application in Release configuration.

I have not done any changes to the Dockerfile and compose files, those are default which are created when I created the project and added the Docker Support.

When I am running the application with Debug configuration, I am getting the below error and it is not running any docker containers to run and debug the application:

Error   MSB4018 The "PrepareForLaunch" task failed unexpectedly.
System.InvalidOperationException: Unable to validate volume mapping. For troubleshooting, follow instructions from http://aka.ms/DockerToolsTroubleshooting
   at Microsoft.DotNet.Docker.BuildTasks.PrepareForLaunch.<ExecuteAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.DotNet.Docker.BuildTasks.DockerBaseTask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() SampleCoreApp   C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DotNet\Microsoft.DotNet.Publishing\ImportAfter\Microsoft.DotNet.Docker.targets  70  

Any help or lead solving this issue will be helpful.

Answer 1

This issue is because of some problem with drive mapping here. So, I have removed one of the drive mapping (- .:/app) and also changed the source argument (obj/Docker/empty to .) in the docker-compose.dev.debug.yml file and it worked for me.

Previous file (docker-compose.dev.debug.yml):

version: '2'

services:
samplecoreapp:
    build:
    args:
        source: obj/Docker/empty
    labels:
    - "com.microsoft.visualstudio.targetoperatingsystem=linux"
    environment:
    - ASPNETCORE_ENVIRONMENT=Development
    - DOTNET_USE_POLLING_FILE_WATCHER=1
    volumes:
    - .:/app
    - ~/.nuget/packages:/root/.nuget/packages:ro
    - ~/clrdbg:/clrdbg:ro
    entrypoint: tail -f /dev/null

After modification:

version: '2'

services:
samplecoreapp:
    build:
    args:
        source: .
    labels:
    - "com.microsoft.visualstudio.targetoperatingsystem=linux"
    environment:
    - ASPNETCORE_ENVIRONMENT=Development
    - DOTNET_USE_POLLING_FILE_WATCHER=1
    volumes:
    - ~/.nuget/packages:/root/.nuget/packages:ro
    - ~/clrdbg:/clrdbg:ro
    entrypoint: tail -f /dev/null

Hope this will be helpful for those who are facing this issue.