Beginning DevOps with Docker

Automate the deployment of your environment with the power of the Docker toolchain

Joseph Muli

• Publisher: Packt Publishing
• Year: 2018
• eBook ISBN: 9781789539578
• Edition: 1
• Topic: Computer Science
• Subtopic: Cloud Computing
• Index: Computer Science

It can be tough to roll out a pre-configured environment if you don't know what you're doing. We'll show you how to streamline your service options with Docker, so that you can scale in an agile, responsive manner. About This Book• Learn how to structure your own Docker containers• Create and manage multiple configuration images• Understand how to scale and deploy bespoke environmentsWho This Book Is ForThis book is ideal for developers, system architects and site reliability engineers (SREs) who wish to adopt a Docker-based workflow for consistency, speed and isolation of system resources within their applications. You'll need to be comfortable working with the command line.What You Will Learn• Learn to design and build containers for different kinds of applications• Create a testing environment to identify issues that may cause production deployments to fail• Discover how you can correctly structure and manage a multi-tier environment• Run, debug, and experiment with example applications in Docker containersIn DetailMaking sure that your application runs across different systems as intended is quickly becoming a standard development requirement. With Docker, you can ensure that what you build will behave the way you expect it to, regardless of where it's deployed. By guiding you through Docker from start to finish (from installation, to the Docker Registry, all the way through to working with Docker Swarms), we'll equip you with the skills you need to migrate your workflow to Docker with complete confidence.Style and approachThis is a fast-paced, practical hands-on book aimed at experienced developers and system architects. As you progress you'll find helpful tips and tricks, as well as useful self-assessment material, exercises and activities to help benchmark your progress and reinforce what you've learned. The activities are devised to simulate the real-world conditions in order to equip you with the necessary skills to accelerate software deployment while still retaining security, portability and saving on costs.

Beginning DevOps with Docker

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Table of Contents

Beginning DevOps with Docker

Why subscribe?

PacktPub.com

Contributors

About the author

About the reviewer

Packt is searching for authors like you

Preface

Hardware

Software

Who This Book is for

Conventions

Reader Feedback

Customer Support

Downloading the Example Code

Installation

Errata

Piracy

Questions

1. Images and Containers

Lesson Objectives

Virtualization versus Containerization

How Docker Improves a DevOps Workflow

Recap of the Docker Environment

Basic Docker Terminal Commands

Activity 1 — Utilizing the docker pull Command

Activity 2 — Analyzing the Docker CLI

Dockerfile Syntax

Writing Dockerfiles for Python and JavaScript examples

Python

JavaScript

Activity 3 — Building the Dockerfile

Building Images

docker build

Removing Docker Images

Activity 4 — Utilizing the Docker Image

Running Containers From Images

Python

Versioning Images and Docker Hub

Deploying a Docker Image to Docker Hub

Summary

2. Application Container Management

Lesson Objectives

The docker-compose Tool

Installing docker-compose

Overview of a Multi-Container Application Setup

The Frontend

The Backend

The Database

Using docker-compose

docker-compose first run

Activity 1 — Running WordPress Using docker-compose

The docker-compose file: docker-compose.yml

The docker-compose CLI

Activity 2 — Analyzing the docker- compose CLI

Managing Multiple Containers and Distributed Application Bundles

Improve a Docker Workflow

The Django Compose File Broken Down

Endure Data Using Volumes

Ports

Activity 3 — Running the docker-compose File

Networking with docker-compose

Run the WordPress Containers

Summary

3. Orchestration and Delivery

Lesson Objectives

Orchestration

An Overview of Docker Swarm

Using Docker Engine to Create a Swarm

Creating Docker Machines

Listing Created Machines

Worker Machine Creation

Initializing our Swarm

Connecting to a Machine

Initializing Swarm Mode

Adding Workers to our Swarm

Viewing a Cluster's Status

Activity 1 — Adding Nodes to a Cluster

Managing Services and Applications in a Swarm

Creating a Service

Listing Services

Service Status

How Do We Know Our Site is Running?

Activity 2 — Running Services on a Swarm

Scaling Services Up and Down

Scaling Our Database Service

How Does Swarm Know Where to Schedule a Service?

How Does Swarm Load Balance Requests between Replicas?

Activity 3 — Scaling Services on a Swarm

Summary

Index

Beginning DevOps with Docker

Copyright © 2018 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing or its dealers and distributors, will be held liable for any damages caused or alleged to have been caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

Acquisition Editor: Koushik Sen

Content Development Editor: Darren Patel

Production Coordinators: Vishal Pawar, Samita Warang

First published: May 2018

Production reference: 1310518

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78953-240-1

www.packtpub.com

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• Beginning DevOps with Docker