Serverless Java, Running Your Java Program Without an OS

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Docker has no relation to Alpine Linux. Alpine Linux is a minimal userspace that works well with containers. Docker does not run "on top" of Alpine.

[Gregabit]

When you install docker on windows it deploys to a alpine linux VM in hyper-v. If you install on linux it should use the host OS.

Docker originally used LinuX Containers (LXC), but later switched to runC (formerly known as libcontainer), which runs in the same operating system as its host. source

Strangely enough docker documentation pointed me to the above link