Dockerfile to build IIS + nanoserver + ASP.NET core

Dockerfile

# escape=`

# Image with NET CORE installation to extract executables for final image
FROM microsoft/aspnetcore:2.0.0-nanoserver As CoreBuild

# Middleware image used to extract ASP.NET core module
From microsoft/iis as WindowsBuild
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'Continue'; $verbosePreference='Continue';"]
# Installing NET CORE webhosting in middleware image so latest module and configuration schema is extracted for final image
ADD https://download.microsoft.com/download/B/1/D/B1D7D5BF-3920-47AA-94BD-7A6E48822F18/DotNetCore.2.0.0-WindowsHosting.exe ".\hosting.exe"
RUN start-process -Filepath .\hosting.exe -ArgumentList @('/install', '/quiet', '/norestart') -Wait 


FROM microsoft/iis:nanoserver
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'Continue'; $verbosePreference='Continue';"]
RUN start-process -Filepath dism.exe -ArgumentList  @('/online', '/enable-feature:IIS-WindowsAuthentication', '/ALL') -Wait  
# Adding NET CORE EXE to Path environment variable
RUN setx /M PATH $($Env:PATH + ';' + $Env:ProgramFiles + '\dotnet')
#Copy dotnet core installation from middleware image
COPY --from=CoreBuild ["c:\\Program Files\\dotnet", "c:\\program files\\dotnet"]
#Copy dotnet core module from middleware image
COPY --from=WindowsBuild ["c:\\Windows\\System32\\inetsrv\\aspnetcore.dll", "c:\\Windows\\System32\\inetsrv\\"]
COPY --from=WindowsBuild ["c:\\Windows\\System32\\inetsrv\\config\\schema\\aspnetcore_schema.xml",  "c:\\Windows\\System32\\inetsrv\\config\\schema\\"]
# Configure IIS to use ASPNET core module
RUN Import-Module IISAdministration; `
    Start-IISCommitDelay; `
    (Get-IISServerManager).GetApplicationHostConfiguration().RootSectionGroup.Sections.Add('appSettings') ; `
    (Get-IISServerManager).GetApplicationHostConfiguration().GetSection('system.webServer/handlers').Overridemode = 'Allow' ; `
    (Get-IISServerManager).GetApplicationHostConfiguration().RootSectionGroup.SectionGroups['system.webServer'].Sections.Add('aspNetCore'); `
    (Get-IISServerManager).GetApplicationHostConfiguration().RootSectionGroup.SectionGroups['system.webServer'].Sections['aspNetCore'].OverrideModeDefault = 'Allow'; `
    New-IISConfigCollectionElement (Get-IISConfigSection 'system.webServer/globalModules' | Get-IISConfigCollection) -ConfigAttribute @{'name'='AspNetCoreModule';'image'='C:\windows\system32\inetsrv\aspnetcore.dll'}; `
    New-IISConfigCollectionElement (Get-IISConfigSection 'system.webServer/modules' | Get-IISConfigCollection) -ConfigAttribute @{'name'='AspNetCoreModule'}; `
    Stop-IISCommitDelay
EXPOSE 80

Why doesn't Microsoft provide an image with Asp.Net Core on IIS?

Updated it for Windows Server 1803 and Asp.Net Core 2.1.1

# escape=`
FROM microsoft/dotnet:2.1.1-aspnetcore-runtime-nanoserver-1803 as CoreBuild

FROM microsoft/iis as WindowsBuild
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'Continue'; $verbosePreference='Continue';"]
ADD https://download.microsoft.com/download/9/3/E/93ED35C8-57B9-4D50-AE32-0330111B38E8/dotnet-hosting-2.1.1-win.exe ".\dotnet-hosting.exe"
RUN start-process -Filepath .\dotnet-hosting.exe -ArgumentList @('/install', '/quiet', '/norestart') -Wait 

FROM microsoft/iis:windowsservercore-1803
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'Continue'; $verbosePreference='Continue';"]
RUN setx /M PATH $($Env:PATH + ';' + $Env:ProgramFiles + '\dotnet')
COPY --from=CoreBuild ["c:\\Program Files\\dotnet", "c:\\program files\\dotnet"]

#Copy dotnet core module from middleware image

COPY --from=WindowsBuild ["c:\\Windows\\System32\\inetsrv\\aspnetcore.dll", "c:\\Windows\\System32\\inetsrv\\"]
COPY --from=WindowsBuild ["c:\\Windows\\System32\\inetsrv\\config\\schema\\aspnetcore_schema.xml",  "c:\\Windows\\System32\\inetsrv\\config\\schema\\"]

COPY ./RegisterAspNetCoreHostIISModule.ps1 ./RegisterAspNetCoreHostIISModule.ps1

RegisterAspNetCoreHostIISModule.ps1:

Import-Module IISAdministration;
Start-IISCommitDelay;
(Get-IISServerManager).GetApplicationHostConfiguration().GetSection('system.webServer/handlers').Overridemode = 'Allow' ;
(Get-IISServerManager).GetApplicationHostConfiguration().RootSectionGroup.SectionGroups['system.webServer'].Sections.Add('aspNetCore');
(Get-IISServerManager).GetApplicationHostConfiguration().RootSectionGroup.SectionGroups['system.webServer'].Sections['aspNetCore'].OverrideModeDefault = 'Allow';
New-IISConfigCollectionElement (Get-IISConfigSection 'system.webServer/globalModules' | Get-IISConfigCollection) -ConfigAttribute @{'name'='AspNetCoreModule';'image'='C:\windows\system32\inetsrv\aspnetcore.dll'};
New-IISConfigCollectionElement (Get-IISConfigSection 'system.webServer/modules' | Get-IISConfigCollection) -ConfigAttribute @{'name'='AspNetCoreModule'};
Stop-IISCommitDelay

Having an issue with the last section where it updates the application config. Docker throws "APPCMD failed with error code 183 Failed to update IIS configuration" on start up. Ideally, the Powershell needs to check if the "appSettings" config section already exists before adding it. So for now, I put the script in a separate file which can be called at-will.