Change your Dockerfile to support Windows authentication

The following snippet demonstrates how to configure your IIS application running inside a container to use a gMSA. The following Dockerfile instructions install and configure Windows authentication inside the container, and on IIS.

# Install Windows Auth in IIS Feature
RUN Install-WindowsFeature -Name Web-Windows-Auth –IncludeAllSubFeature

# Configure the IIS Application Pool account to use Network Service account. 
That enables it to leverage gMSA.
RUN Import-Module WebAdministration; Set-ItemProperty IIS:\AppPools\SiteName 
-name processModel.identityType -value 2

# Disable Anonymous authentication on IIS
RUN Import-Module WebAdministration; Set-WebConfigurationProperty 
-Filter '/system.webServer/security/authentication/anonymousAuthentication' 
-Name Enabled -Value False -PSPath 'IIS:\' -Location 'SiteName'

# Enable Windows Authentication
RUN Import-Module WebAdministration; Set-WebConfigurationProperty 
-Filter '/system.webServer/security/authentication/windowsAuthentication' 
-Name Enabled -Value True -PSPath 'IIS:\' -Location 'SiteName'