Microservices: Flexible Software Architecture

432 Pages·2016·16.33 MB·English

by  Eberhard Wolff

ptg18144917
Microservices
ptg18144917
This page intentionally left blank
ptg18144917
Microservices
Flexible Software Architecture
ptg18144917
Eberhard Wolff
Boston • Columbus • Indianapolis • New York • San Francisco
Amsterdam • Cape Town • Dubai • London • Madrid • Milan
Munich • Paris • Montreal • Toronto • Delhi • Mexico City
São Paulo • Sydney • Hong Kong • Seoul • Singapore • Taipei • Tokyo
Many of the designations used by manufacturers and sellers to distinguish their Editor-in-Chief
products are claimed as trademarks. Where those designations appear in this book, Mark Taub
and the publisher was aware of a trademark claim, the designations have been printed
with initial capital letters or in all capitals. Acquisitions Editor
Chris Guzikowski
The author and publisher have taken care in the preparation of this book, but make
no expressed or implied warranty of any kind and assume no responsibility for errors
Development Editor
or omissions. No liability is assumed for incidental or consequential damages in
Chris Zahn
connection with or arising out of the use of the information or programs contained
herein.
Managing Editor
For information about buying this title in bulk quantities, or for special sales Sandra Schroeder
opportunities (which may include electronic versions; custom cover designs; and
content particular to your business, training goals, marketing focus, or branding Project Editor
interests), please contact our corporate sales department at corpsales@pearsoned. Lori Lyons
com or [phone].
Production Manager
For government sales inquiries, please contact [email protected].  Dhayanidhi
For questions about sales outside the United States, please contact [email protected].
Copy Editor
Visit us on the Web: informit.com/aw Warren Hapke
Library of Congress Control Number: 2016952028
Indexer
Copyright © 2017 Pearson Education, Inc. Erika Millen
ptg18144917
All rights reserved. Printed in the United States of America. This publication is Proofreader
protected by copyright, and permission must be obtained from the publisher prior Sudhakaran
to any prohibited reproduction, storage in a retrieval system, or transmission in any
form or by any means, electronic, mechanical, photocopying, recording, or likewise. Editorial Assistant
For information regarding permissions, request forms and the appropriate contacts Olivia Basegio
within the Pearson Education Global Rights & Permissions Department, please visit
www.pearsoned.com/permissions/. Cover Designer
Chuti Prasertsith
ISBN-13: 978-0-134-60241-7
ISBN-10: 0-134-60241-2 Compositor
codeMantra
Text printed in the United States on recycled paper at RR Donnelley in Crawfordsville,
Indiana.
First printing: October 2016
To my family and friends for their support.
And to the computing community for all the fun it
has provided to me.
ptg18144917
This page intentionally left blank
ptg18144917
Contents at a Glance
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxv
Part I: Motivation and Basics . . . . . . . . . . . . . . . . . . . . . . . . . 1
Chapter 1: Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 2: Microservice Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Part II: Microservices: What, Why, and Why Not? . . . . . . . . 25
Chapter 3: What Are Microservices? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Chapter 4: Reasons for Using Microservices . . . . . . . . . . . . . . . . . . . . . . . 55
Chapter 5: Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
ptg18144917
Chapter 6: Microservices and SOA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Part III: Implementing Microservices . . . . . . . . . . . . . . . . . . 95
Chapter 7: Architecture of Microservice-Based Systems . . . . . . . . . . . . . . . 99
Chapter 8: Integration and Communication . . . . . . . . . . . . . . . . . . . . . . 163
Chapter 9: Architecture of Individual Microservices . . . . . . . . . . . . . . . . 193
Chapter 10: Testing Microservices and Microservice-Based Systems . . . . 213
Chapter 11: Operations and Continuous Delivery of Microservices . . . . . 237
Chapter 12: Organizational Effects of a Microservices-Based
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Part IV: Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Chapter 13: Example of a Microservices-Based Architecture . . . . . . . . . . 303
Chapter 14: Technologies for Nanoservices . . . . . . . . . . . . . . . . . . . . . . . 343
Chapter 15: Getting Started with Microservices . . . . . . . . . . . . . . . . . . . . 369
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
vii
This page intentionally left blank
ptg18144917
Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxv
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxi
About the Author . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxiii
Part I: Motivation and Basics . . . . . . . . . . . . . . . . . . . . . . . . . 1
Chapter 1: Preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Overview of Microservice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Microservice: Preliminary Definition . . . . . . . . . . . . . . . . . . . . . 3
Deployment Monoliths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Why Microservices? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Strong Modularization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ptg18144917
Easy Replaceability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sustainable Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Further Development of Legacy Applications . . . . . . . . . . . . . . 6
Time-to-Market . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Independent Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Free Choice of Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Continuous Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 2: Microservice Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Modernizing an E-Commerce Legacy Application . . . . . . . . . . . . 11
Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reasons to Use Microservices . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Slow Continuous Delivery Pipeline . . . . . . . . . . . . . . . . . . . . . . 12
Parallel Work Is Complicated . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Bottleneck During Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ix