Book Image

Mastering Docker

By : Scott Gallagher
Book Image

Mastering Docker

By: Scott Gallagher

Overview of this book

<p><span id="description" class="sugar_field">Docker has been a game-changer when it comes to virtualization – it has now grown to become a key driver of innovation beyond system administration, having an impact on the world of web development and more. But how can you make sure you’re keeping up with the innovations that it’s driving? How can you be sure you’re using it to its full potential? Mastering Docker shows you how – it not only demonstrates how to use Docker more effectively, it also helps you rethink and reimagine what’s possible with Docker.</span></p> <p><span class="sugar_field"><span id="description" class="sugar_field"> Covering best practices to make sure you’re confident with and the basics, such as building, managing and storing containers, before diving deeper into Docker security, you’ll find everything you need to help you extend and integrate Docker in new and innovative ways. You’ll learn how to take greater control over your containers using some of Docker’s most sophisticated and useful tools, such as Docker compose and Docker swarm, before bringing together everything you already know and have learned to put your containers into production and monitor them for safety and performance.</span></span></p> <p><span class="sugar_field"><span class="sugar_field"><span id="description" class="sugar_field"> Beyond this, you’ll also explore even more advanced strategies, as you learn how to extend and integrate Docker with cloud platforms such as Heroku and OpenStack, and how tools such as Kubernetes can improve the way you manage large-scale container orchestration. With further guidance on how you can use configuration management tools such as Puppet, Chef and PowerShell, by the end of the book you’ll have a broad and detailed sense of exactly what’s possible with Docker – and how seamlessly it fits with a range of other platforms and tools.</span></span></span></p>
Table of Contents (20 chapters)
Mastering Docker
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Dockerfile


In this section, we will cover the Dockerfile from a more in-depth perspective than the previous chapter along with the best practices to use. By the end of the section, you will be structuring your Dockerfile in the most practical and efficient method. You will also be able to read and troubleshoot both yours and others' Dockerfile.

A short review of Dockerfile

In the previous chapter, we did a review of the Dockerfile and its content. We looked at something like this:

FROM ubuntu:latest
MAINTAINER Scott P. Gallagher <[email protected]>

RUN apt-get update && apt-get install -y apache2

ADD 000-default.conf /etc/apache2/sites-available/
RUN chown root:root /etc/apache2/sites-available/000-default.conf

EXPOSE 80
CMD ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]

We saw earlier and in this example as well the basic items that are inside a Dockerfile. The FROM and MAINTAINER fields have information on what image is to be used and who is the maintainer of that image. The...