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

Docker Compose – examples


In this section, we will take a look at some examples and break them to understand what we can do within the docker-compose.yml file. Remember, earlier we discussed that in the YAML file, there needs to be either an image section or a build section. Let's take a look at an example using each. Then, we will look at an example using as many of the options available for the Docker Compose YAML file as possible.

Here is a breakdown of an example docker-compose.yml file. We will break the contents into sections to help you understand each entry.

image

The image section tells Docker Compose that you are going to define the configuration of your containers and what settings each will have:

haproxy:#container name
  image: tutum/haproxy #image to use from the Docker Hub
  ports: #defining our port setup
    - "80:80" #port to map from Docker Host: to container
  links: #what containers to link to/with
    - varnish1
    - varnish2
varnish1:
  image: jacksoncage/varnish
  ports...