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Build Your Own PaaS with Docker by Oskar Hane

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Chapter 2. Exploring Docker

After reading this chapter, you will find yourself more comfortable talking about and using Docker. The following topics will be covered here:

  • The Docker image
  • The Docker container
  • The Docker command-line interface
  • The Docker Registry Hub

You will find these topics important when building your PaaS, and you will use and interact with all of them throughout this book.

The Docker image

In the beginning, it can be hard to understand the difference between a Docker image and a Docker (or Linux) container.

Imagine that our Linux kernel is layer zero. Whenever we run a Docker image, a layer is put on top of our kernel layer. This image, layer one, is a read-only image and cannot be changed or cannot hold a state.

A Docker image can ...

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