Rafael Gomes - Docker for Developers

My first thanks go to the person who gave me the chance of being here and to be able to write this book: my mother. The famous Cigana, or Dona Arlete, a wonderful person and a role model.

I want also thank to my second mother, Dona Maria, who took so much care of me when I was a kid while Dona Arlete was taking care of her two other kids and a nephew. I feel lucky for having two moms while many dont have one.

I take this chance to thanks the person who introduced Docker to me, Robinho, also known as Robson Peixoto. In a conversation during the Lingugil meeting, in Salvador, Bahia, he told me: Study Docker! And here I am finishing a book that transformed my life. I truly thank you, Robinho!

Thanks to Lus Armando Bianchin, who started to write along with me but was not able to go on for other reasons. Im very grateful, for your constant feedback kept me going on writing this book.

Thanks to Paulo Caroli who encouraged me to write the book and introduced me to the Leanpub platform. If it wasnt for him, this book would not be here so quick.

Thanks to the amazing Emma Pinheiro, for the beautiful cover. I also want to thanks a lot the incredible people from Raul Hacker Club, who have strongly encouraged me this whole time.

Thanks for the mother of my son, Eriane Soares, who is an amazing friend of mine and have encouraged me to write the book while we were still living together!

As every open knowledge product, this book wouldnt be possible without the help of the vibrant Docker Brazil community. I will highlight the effort of some members of reading several chapters many times and dedicating their precious time and suggesting improvements:

• Gjuniioor
• Marco Antonio Martins Junior - Wrote the chapters Can I run GUI applications and Useful commands.
• Jorge Flvio Costa
• Glesio Paiva
• Bruno Emanuel Silva
• George Moura
• Felipe de Morais
• Waldemar Neto
• Igor Garcia
• Diogo Fernandes

Possibly, I have forgotten to mention some people here, but as I recover my logs I will updated it.

Introduction

This part of the book is for those who dont have any basic knowledge of Docker. In case you do, dont be shy and jump to the next part. However, even if you do know Docker, we are presenting explanations on several available resources and how they work.

Even if you are a regular Docker user, reading this part of the book at some point of your life can be important in order to know more about what happens at every executed command.

Why using Docker?

Docker has been a very commented subject lately, many articles have been written, usually talking about how to use it, auxiliary tools, integrations and the like, but many people still ask the most basic question when its about the possibility of using any new technology: Why should I use this? Or would it be: What this has to offer me that is different from what I have today?

It is natural that people still doubt the Dockers potential, some even think that its about some hype. But in this chapter we intend to show some good reasons to use Docker.

Its important to highlight that Docker is not a silver bullet it is not intended to solve all the problemas, much less being the only solution to several situations.

Here are some good reasons for using Docker:

1 Similar environments

Its worth to highlight that Docker is not a silver bullet it is not intended to solve all the problemas, much less being the only solution to several situations. Once your application is turned into a Docker imagem, it can be instantiated as a container in any environment you wish. That means you can use the application at the developers notebook as well as it would run at the production server.