Preview Docker Orchestration
Docker Orchestration A concise, fast-paced guide to orchestrating and deploying scalable services with Docker Randall Smith BIRMINGHAM - MUMBAI Docker Orchestration Copyright © 2017 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, and its dealers and distributors will be held liable for any damages caused or alleged to be 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. First published: January 2017 Production reference: 1190117 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78712-212-3 www.packtpub.com Credits Author Copy Editor Randall Smith Tom Jacob Reviewer Project Coordinator Vincent De Smet Kinjal Bari Commissioning Editor Proofreader Pratik Shah Safis Editing Acquisition Editor Indexer Rahul Nair Tejal Daruwale Soni Content Development Editors Graphics Radhika Atitkar Kirk D'Penha Sanjeet Rao Technical Editor Production Coordinator Bhagyashree Rai Melwyn Dsa About the Author Randall Smith is a senior systems administrator at Adams State University. He has been administering Windows, Linux, and BSD systems since 1999. He has been active in helping other sysadmins solve problems online and off. He has presented at the Colorado Higher Ed Computing Organization and Educause conferences on topics including Linux KVM and Ceph. In his spare time, Randall streams Let's Play gaming videos at Music Free Gaming on YouTube and Twitch. I would like to thank my family for their support and understanding as I disappeared into my bedroom for hours at a time to write this book. I would like to thank Adams State University for providing servers used for testing and the opportunity to play with really cool software such as Docker. Finally, I would like to thank the reviewers and everyone at Packt who helped make this book possible. I want to give a special shout-out to all of the developers and companies who have open- sourced the tools described in this book. You all make it so much much easier for the rest of us to get the job done. Thank you all so much. About the Reviewer Vincent De Smet is a Docker Captain with experience as an IT consultant and a DevOps engineer in Vietnam and Singapore, respectively. He's also a co-organizer of the Docker Saigon and Cloud Native Singapore meetups. Vincent loves to deep dive into container internals, is an active speaker, and publishes articles to the docker-saigon.github.io blog. www.PacktPub.com For support files and downloads related to your book, please visit www.PacktPub.com. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@packtpub.com for more details. 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Table of Contents Preface 1 Chapter 1: Getting Started with Docker Orchestration 7 Installing Docker Engine 8 Installing with Docker Machine 9 Starting a host on AWS 9 Starting a host on GCE 12 Starting a host on Microsoft Azure 13 Installing on a running Linux host 15 Introducing Docker-specific distributions 16 CoreOS 16 RancherOS 18 Project Atomic / RHEL Atomic 19 Running single container applications 20 What is running? 24 Inspecting your container 25 Summary 26 Chapter 2: Building Multi-Container Applications with Docker Compose 27 Building an image with Docker Engine 28 Building from a Dockerfile 28 Tagging the image 29 Skipping the build cache 30 Running the image 30 Installing Docker Compose 31 Writing a Docker Compose file 32 Multi-container applications 34 Using environment files 35 Extending compose files 36 Controlling start order 38 Using Docker networks 40 Keeping your data safe in volumes 42 Summary 44 Chapter 3: Cluster Building Blocks – Registry, Overlay Networks, and Shared Storage 45 Creating a Docker Registry 46 Using the Docker Hub 46 Logging in 47 Working with a repository 49 Automating image builds with Docker Hub 50 Integration with Docker Cloud 52 Using the GitLab Container Registry 52 Installing GitLab on Ubuntu 52 Enabling Docker Registry on a project 54 Introducing the Docker Trusted Registry and Docker Datacenter 55 Building it yourself 55 Connecting containers with overlay networks 57 Using Docker native overlays 57 Working with DNS-SD 58 Publishing services with mesh routing mode 60 Using Weave 60 Installing Weave 61 Connecting containers to Weave 62 Using Flannel 63 Configuring etcd and Flannel 63 Starting a CoreOS cluster with Flannel 65 Connecting to Flannel 66 Using shared network storage for Docker volumes 68 Introducing Ceph 68 Using Ceph with Docker 69 Creating a Docker volume 70 Other shared storage plugins 71 Summary 71 Chapter 4: Orchestration with Docker Swarm 72 Setting up a swarm 72 Initializing a swarm 73 Managing a swarm 74 Adding a node 74 Promoting and demoting nodes 75 Changing node availability 75 Pausing a node 76 Draining a node 76 Activating a node 77 Removing nodes 77 Recovering from a disaster 78 Restarting the full cluster 79 Backup and recovery 79 [ ii ]
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