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Building

Microservices

DESIGNING FINE-GRAINED SYSTEMS

Sam Newman

Building Microservices

Distributed systems have become more fine-grained in the past 10 years,

shifting from code-heavy monolithic applications to smaller, self-contained

microservices. But developing these systems brings its own set of headaches.

With lots of examples and practical advice, this book takes a holistic view of the

topics that system architects and administrators must consider when building,

managing, and evolving microservice architectures.

Microservice technologies are moving quickly. Author Sam Newman provides

you with a firm grounding in the concepts while diving into current solutions

for modeling, integrating, testing, deploying, and monitoring your own

autonomous services. You’ll follow a fictional company throughout the book

to learn how building a microservice architecture affects a single domain.

■

The Microservices

“

architecture has many

appealing qualities, but

the road towards it has

painful traps for the

unwary. This book will

help you figure out if this

path is for you, and how

to avoid those traps on

your journey.

Discover how microservices allow you to align your system

design with your organization’s goals

Learn options for integrating a service with the rest of your

system

Take an incremental approach when splitting monolithic

codebases

Deploy individual microservices through continuous

integration

Examine the complexities of testing and monitoring distributed

services

Manage security with user-to-service and service-to-service

models

Understand the challenges of scaling microservice

architectures

”

Chief Scientist, ThoughtWorks

—Martin Fowler

■

Sam Newman

is a technologist at ThoughtWorks, where he splits his time

between helping clients globally and working as an architect for ThoughtWorks’

internal systems. He has worked with a variety of companies around the world on

both development and IT operations.

PROGR AMMING

Twitter: @oreillymedia

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CAN $57.99

US $49.99

ISBN: 978-1-491-95035-7

Building Microservices

Sam Newman

Building Microservices

by Sam Newman

Printed in the United States of America.

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

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Editors:

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February 2015:

First Edition

Indexer:

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Revision History for the First Edition

2014-01-30:

First Release

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for release details.

The O’Reilly logo is a registered trademark of O’Reilly Media, Inc.

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of honey bees, and related trade dress are trademarks of O’Reilly Media, Inc.

While the publisher and the author have used good faith efforts to ensure that the information and

instructions contained in this work are accurate, the publisher and the author disclaim all responsibility

for errors or omissions, including without limitation responsibility for damages resulting from the use of

or reliance on this work. Use of the information and instructions contained in this work is at your own

risk. If any code samples or other technology this work contains or describes is subject to open source

licenses or the intellectual property rights of others, it is your responsibility to ensure that your use

thereof complies with such licenses and/or rights.

978-1-491-95035-7

[LSI]

Table of Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

1. Microservices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

What Are Microservices?

Small, and Focused on Doing One Thing Well

Autonomous

Key Benefits

Technology Heterogeneity

Resilience

Scaling

Ease of Deployment

Organizational Alignment

Composability

Optimizing for Replaceability

What About Service-Oriented Architecture?

Other Decompositional Techniques

Shared Libraries

Modules

No Silver Bullet

Summary

Inaccurate Comparisons

An Evolutionary Vision for the Architect

Zoning

A Principled Approach

Strategic Goals

Principles

iii

2. The Evolutionary Architect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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