Building Docker Images from a Container

“This article was excerpted from the book Docker in Action

It is easy to get started building images if you are already familiar with using containers. A union file system (UFS) mount provides a container’s file system so any changes that you make to the file system inside a container will be written as new layers that are owned by the container that created them.

Before you work with real software, this article will detail the typical workflow using a Hello World example…”

http://www.developer.com/db/building-docker-images-from-a-container2.html

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