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What Are Containers and Why Should I Use Them?

This first chapter will introduce you to the world of containers and their orchestration. This book starts from the very beginning, in that it assumes that you have no prior knowledge of containers, and will give you a very practical introduction to the topic.

In this chapter, we will focus on the software supply chain and the friction within it. Then, we'll present containers, which are used to reduce this friction and add enterprise-grade security on top of it. We'll also look into how containers and the ecosystem around them are assembled. We'll specifically point out the distinction between the upstream Open Source Software (OSS) components, united under the code name Moby, that form the building blocks of the downstream products of Docker and other vendors.

The chapter covers the following topics...

Key benefits

Grasp basic to advanced Docker concepts with this comprehensive guide

Get acquainted with Docker containers, Docker images, orchestrators, cloud integration, and networking

Learn to simplify dependencies and deploy and test containers in production

Description

Containers enable you to package an application with all the components it needs, such as libraries and other dependencies, and ship it as one package. Docker containers have revolutionized the software supply chain in both small and large enterprises. Starting with an introduction to Docker fundamentals and setting up an environment to work with it, you’ll delve into concepts such as Docker containers, Docker images, and Docker Compose. As you progress, the book will help you explore deployment, orchestration, networking, and security. Finally, you’ll get to grips with Docker functionalities on public clouds such as Amazon Web Services (AWS), Azure, and Google Cloud Platform (GCP), and learn about Docker Enterprise Edition features. Additionally, you’ll also discover the benefits of increased security with the use of containers. By the end of this Docker book, you’ll be able to build, ship, and run a containerized, highly distributed application on Docker Swarm or Kubernetes, running on-premises or in the cloud.

Who is this book for?

This book is for Linux professionals, system administrators, operations engineers, DevOps engineers, and developers or stakeholders who are interested in getting started with Docker from scratch. No prior experience with Docker containers is required. Users with a Linux system would be able to take full advantage of this book.

What you will learn

Containerize your traditional or microservice-based applications

Develop, modify, debug, and test an application running inside a container

Share or ship your application as an immutable container image

Build a Docker Swarm and a Kubernetes cluster in the cloud

Run a highly distributed application using Docker Swarm or Kubernetes

Update or rollback a distributed application with zero downtime

Secure your applications with encapsulation, networks, and secrets

Troubleshoot a containerized, highly distributed application in the cloud

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

AI Assistant (beta) to help accelerate your learning

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livernyc Jan 01, 2021

I really enjoyed this book. It takes a liner path through docker and best practices to orchestrators. The book lets you follow along with examples. I only have a solid Microsoft background and intermediate Linux skills and I was able to follow along pretty much. This is a great book to help you wrap your mind around Docker containers and orchestrators. I'm no expert with these technologies but I definitely recommend this book if you have limited exposure to containers and docker and how they tie into orchestrators.

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Matthew Emerick Jul 14, 2020

About This BookThis book gives the reader a complete view of Docker, why you should use it, how to use it, and how to use it well. It gives the reader best practices from the beginning, no matter if they are using Windows, Linux, or a Mac. It starts from explaining what containers are, how to set them up, and then goes into tremendous detail on how to use them to the best advantage.Please keep in mind that this book was primarily written with Linux in mind, not Windows. There can be issues if working through this book using Windows. While you can work out how to make it work on your own, it can be very frustrating and ruin your enjoyment of the book. Packt offers a more Windows oriented book on Docker that may be a better match for you. This issue is mentioned on page 34, though would probably have been better placed in the preface to warn the reader before purchase.Who is This For?The author is taking a broad approach by making this for anyone who has no knowledge of Docker but needs to work with the technology. It is a straight forward reference and tutorial that intends to be suited for any beginner or intermediate Docker user.Why Was This Written?Technology is moving at a very fast pace and will continue to for years to come. Containerization is a fairly new, but extremely powerful, technique that is very popular and almost a necessity when entering the workforce as a software developer or architect. This book has every typically use case of Docker covered from installation to automation, making it easier to use than the official documentation.OrganizationThe book is organized into four sections. The first, and shortest, discusses why containers exist, why you should use them, and how to set up your system to use them. Then the book moves on to creating and using individual containers from the initial setup to automating them. Next, the book looks at how containers can work together. Finally, the author details how to use Kubernetes and the cloud with Docker to round out your understanding.Most chapters have a similar structure. They begin with the technical requirements to work through that chapter before moving on to the learning. The chapter finishes with a summary what was discussed, questions to help with your recall of the information, and links to other resources that will let you dig deeper into the chapter's topic.Did This Book Succeed?This book can easily take the place of the official documentation. Looking through the book, I went from having no knowledge of Docker to being competent. After building up some experience with my own projects, I will feel confident enough to work with it professionally.Rating and Final ThoughtsThis is an excellent book for anyone who needs to learn and use Docker. It definitely hits what it's aiming for, with only a few minor issues. I give it a 4.7 out of 5. If you need to learn Docker, this is probably the book for you.

A R Jul 01, 2021

I have struggled with understanding Docker and containerization for a couple years. Mainly due to not using them all the time.Invested time into tutorials and videos, but that did not really cement anything for me.However, reading this book cover to cover and coming back to try some of the practical examples has really worked for me.Well written, gradually building up to slightly more complex scenarios.Technical books have always been a struggle to read through completely for me, yet this book for some reason kept me engaged.Well worth it, examples cover some Python, NodeJS, Java and C#.

treesa Jun 18, 2020

Unable to get the exercises to work on my windows machine. So much research to stitch together workarounds. Stopped at ch06.Resumed to absorb the conceptual knowledge and the chapters are networking and orchestration are quite good.

Just Some Guy Nov 29, 2021

Here's the TL;DR: This book is good, but it's not great. The tutorials are very good, but you should read other Docker books first to learn the fundamentals, then others again later for reference and depth.The Good:The books is at its best during the numerous step-by-step tutorials, which include ample code and screenshots for reference. The author starts with basic examples, and progresses to increasingly complex topics throughout the book. He does assume a fairly strong foundation in Linux/bash and networking (fair warning), but nothing too extreme for a search engine to answer if pressed.The Bad:This book is in no way a comprehensive education in Docker or Kubernetes. Beyond the specific tasks that the tutorials walk the reader through it does a poor job of explaining (in any real depth) the inner working of Docker/Kubernetes, and/or the wide range of APIs, commands, parameters, configurations, use cases, etc. that each support.No book can cover everything, of course - but I'm really glad I read a few other books on both topics before reading this, as I generally knew all the fundamentals going in (this book then helped me to gain some more hand-on experience, and taught me some great Docker dev techniques and tricks). I'd recommend anyone who wants to *really* learn these technologies start elsewhere first. This book just doesn't go deep outside of the narrow tactical goals which comprise the tutorial content.I should also note that while there are several chapters focused on Kubernetes, it is such a massive topic that this book only offers a very shallow introduction. It's not bad, but again you should start elsewhere to learn the tech, then read this for some nice intro k8s tutorials.The Ugly:This is probably just a personal peeve, but I just can't stand Schenker's writing style. He's just ... not very a very good writer. He writes at a high-school level in both vocabulary and style (the numerous run-on sentences in particular got on my nerves). Furthermore, the 'voice' he uses is far too casual and familiar for my taste (we're not pals talking tech over lunch - I'm paying you to teach me something of value. Act like it, please.). Like, if you have a point to make, don't ask a rhetorical question pretending to be your reader - this isn't a casual conversation. Write like an adult, make your case, and make your point. Thanks.If he matched the loose and sloppy writing with serious depth and value, I'd let it slide - but outside of the tutorials (which _are_ numerous, extensive, and (again) very good), his writing has too much fluff and personality, for too little value (i.e. poor signal/noise ratio).Final word - Read a few other books first, then read this for the Docker tutorials and a decent introduction to Kubernetes.

Learn Docker - Fundamentals of Docker 19.x: Build, test, ship, and run containers with Docker and Kubernetes , Second Edition

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Learn Docker - Fundamentals of Docker 19.x

What Are Containers and Why Should I Use Them?

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Why are containers important?

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