What is Alpine Linux Docker?

Alpine is a lightweight linux distribution based on musl libc and busybox.

There is a docker image based on Alpine which is an easy way of getting started with Alpine.

How is Alpine Linux so small?

Small. Alpine Linux is built around musl libc and busybox. This makes it smaller and more resource efficient than traditional GNU/Linux distributions. A container requires no more than 8 MB and a minimal installation to disk requires around 130 MB of storage.