Container OS image

Container OS images or base images are the very first layer that makes up every container; these images are provided by Microsoft. Two of the images available today are windowsservercore and nanoserver.

OS image provides the OS libraries for the container. Developers can create Windows Server Containers by downloading the base image and adding more layers as per the application needs. OS images are nothing but .wim files that get downloaded from OneGet, a PowerShell package manager for Windows. OneGet is included in Windows 10 and Windows Server 2016 versions. Base OS images are sometimes huge, but Microsoft allows us to download the file once and save it offline for reusing without Internet connection or within an enterprise network.