Smiler S.K. - Learning CoreOS
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Your one-stop guide for building, configuring, maintaining, and deploying one of the worlds fastest growing OSes
About This Book
Understand the features of CoreOS and learn to administrate and secure a CoreOS environment
Develop, test, and deploy cloud services and applications more quickly and efficiently inside lightweight containers using CoreOS
This is a complete tutorial on CoreOS, which is the preferred OS for cloud computing as it contains components that facilitate cloud management
What You Will Learn
Understand the benefits of CoreOS as a cloud orchestration platform
Learn about lightweight containers and various container frameworks such as Docker and RKT in CoreOS
Manage services and containers across cluster using Fleet and systemd
Set up a CoreOS environment using Vagrant
Create and manage CoreOS clusters
Discover the service parameters using etcd
Find out about chaining services running on the cluster using Flannel / Rudder and Weave
Create a virtual tenant network and service chaining using OVS
In Detail
CoreOS is an open source operating system developed upon the Linux kernel. The rise of CoreOS is directly related to the rise of Docker (a Linux container management system). It is a minimal operating system layer and takes a different approach to automating the deployment of containers. The major difference between CoreOS and other Linux distributions is that CoreOS was designed to deploy hundreds of servers. CoreOS immensely helps the users to create systems, which are easy to scale and manage, making life easier for all, be it developer, QA, or deployer.
This book is all about setting up, deploying, and using CoreOS to manage clusters and clouds. It will help you understand what CoreOS is and its benefits as a cloud orchestration platform. First, well show you how to set up a simple CoreOS instance with single node in the cluster and how to run a Docker container inside the CoreOS instance. Next, youll be introduced to Fleet and systemd, and will deploy and distribute Docker services across different nodes in cluster using Fleet.
Later, youll be briefed about running services in a cluster with constraints, publishing the services already running on the cluster to new services, and making your services interact with each other. We conclude by teaching you about advanced container networking. By the end of the book, you will know the salient features of CoreOS and will be able to deploy, administrate, and secure a CoreOS environment.
Style and approach
This practical guide covers the basics and advanced topics related to CoreOS and lightweight containers. The topics are covered in an easy-to-follow manner with each feature explained in detail, beginning with a brief overview and followed by an explanation of its corresponding configuration files
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Copyright 2016 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 authors, 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: March 2016
Production reference: 1160316
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78588-830-4
www.packtpub.com
Authors
Kingston Smiler. S
Shantanu Agrawal
Reviewer
Aneesh Kumar
Acquisition Editor
Divya Poojari
Content Development Editor
Shali Deeraj
Technical Editor
Mohit Hassija
Copy Editors
Dipti Mankame
Jonathan Todd
Project Coordinator
Kinjal Bari
Proofreader
Safis Editing
Indexer
Priya Sane
Graphics
Kirk D'Penha
Production Coordinator
Shantanu N. Zagade
Cover Work
Shantanu N. Zagade
Kingston Smiler. S is a seasoned professional with 12 years of experience in software development and presales, encompassing wide range of skill set, roles, and industry verticals. He has solid expertise in data communication networking and software-based switching and routing solutions, and virtualization platforms such as OpenStack, OpenDaylight controller, Docker Containers, and CoreOS. He is currently working as an advisor and technical consultant for networking companies in the development of Layer2 and Layer3 IP protocols.
He also has working experience in building IoT sensor networks with IoT OSes such as RIOT and Contiki; SoCs such as Arduino, Raspberry Pi, and Intel Galileo; and IoT protocols such as 802.14.5 (Zigbee), 6lowpan, RPL, CoAP, and MQTT. He is interested in building small-scale robots using Arduino and ROS Robotics platforms.
Active in various networking standard bodies such as IETF, IEEE, and ONF, Kingston has proposed two drafts in TRILL WG and one draft in MPLS WG of IETF. With the current surge in SDN, virtualization, and NFV, his primary focus is towards these areas. He completed a bachelor of engineering degree in computer science from Madras University.
Kingston is also the author of OpenFlow Cookbook, Packt Publishing .
First and foremost, I would like to thank the lord to give me immense confidence and energy to start and complete this book successfully. I want to thank my kids, mother, brother, sister, and all my other family members for their support and encouragement. Thanks to my coauthor Shantanu Agrawal who helped me finish the book on time. Thanks to Shali and Divya for their reviews and helping me to finish this book despite their busy schedule. Special thanks to my wife for her patience and support in bringing up this book as most part of the book was written on weekends, at night, and during vacations.
Shantanu Agrawal has over 15 years of experience in the telecom industry working in systems having high transaction rates with scalable architectures. He has extensive experience of consulting for solutions, designing, and implementing high-performing and highly available software. He has exposure to the complete life cycle of the product development and deployment challenges. During his journey, he has worked on different hardware platforms and operating systems, such as proprietary UNIX-based hardware, embedded systems with real-time operating systems, Linux, Solaris, and so on. He has experience in the core network elements and protocols used in GSM/UMTS/LTE networks. He graduated from IIT BTU and did post-graduation from BITS Pilani.
I would thank my family for allowing me to squeeze their time for this book and for being understanding. I would also want to thank my coauthor Kingston Smiler for driving this to completion and for his excellent contributions.
Aneesh Kumar is a principal engineer and Cloud evangelist at Pramati Technologies. He is a developer, hacker, and DevOps. Aneesh brings with him over 7 years of in-depth experience in designing and building complex Cloud architecture and web platforms. He's passionate about open source technologies and cloud infrastructures at scale.
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As more and more applications are moving towards the cloud with server virtualization, there is a clear necessity to deploy the user applications and services very fast and make them reliable with assured SLA by deploying the services in a right set of servers. This becomes more complex when these services are dynamic in nature, which results in making these services autoprovisioned and autoscaled over a set of nodes. The orchestration of the user application is not limited to deploy the services in the right set of server or virtual machines rather to be extended to provide network connectivity across these services to provide Infrastructure as a Service ( IaaS ). Compute, network, and storage are the three main resources to be managed by the cloud provider in order to provide (IaaS). Currently, there are various mechanisms to handle these requirements in more abstract fashion. There are multiple cloud orchestration frameworks, which can manage the compute, storage, and networking resources. OpenStack, Cloud Stack, and VMware vSphere are some of the cloud platforms that orchestrate these resource pools and provide IaaS.
The server virtualization provided by a Virtual Machine (VM) has its own overhead of running a separate instance of the operating system on every virtual machine. This brings down the number of VM instances that can be run on the server, which heavily impacts the operational expense. As Linux namespace, containers technologies, such as docker and rkt, are gaining its popularity; one more level of server virtualization can be introduced by deploying the application services inside a container rather than VM However, there is a necessity of an orchestration and clustering framework for the containers or dockers for deploying the services in the cluster, the discovery of the service and service parameters, providing network across these containers or dockers, and so on. CoreOS is developed for this purpose.
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