Bootstrapping Microservices with Docker, Kubernetes, and Terraform: A project-based guide

440 Pages·2021·14.26 MB·english

by  Ashley Davis

A project-based guide
Ashley Davis
M A N N I N G
Developing and testing
multiple microservices
under Docker Compose
Development workstation
Docker Compose Developing and testing
individual microservices
directly under Node.js
Web Creating infrastructure and
browser Creating infrastructure and microservices automatically
microservices directly from through a continuous
Node.js your dev workstation with delivery (CD) pipeline with
Terraform Terraform
FlixTube Kubernetes
developer
Terraform
Continous delivery
Git Code Code Terraform
repo repo
Essential microservice skills
Developers write and test code on Less frequently, changes are merged
their development workstations. to the test environment.
Development Developers frequently Even less frequently, when the test
workstation merge their changes environment is deemed stable,
Microservices to the dev environment. functional, and well tested, it is
Developer application merged to production.
Development Test Production
environment environment environment
Microservices Microservices Microservices
application application application Customer
Development
workstation
Microservices
Developer application
Prior to moving changes to Code is now live in
Changes are integrated and production, these are tested the customer-facing
tested in the dev environment. in the test environment. production environment.
Developers must work together Code is updated less frequently
to fix problems that are found so there is more time for testing.
in dev after integration.
Typical workflow progression
Bootstrapping Microservices
with Docker, Kubernetes, and Terraform

Bootstrapping Microservices
with Docker, Kubernetes,
and Terraform
A -
PROJECT BASED GUIDE
ASHLEY DAVIS
MANNING
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ISBN 9781617297212
Printed in the United States of America
brief contents
1 ■ Why microservices? 1
2 ■ Creating your first microservice 20
3 ■ Publishing your first microservice 51
4 ■ Data management for microservices 82
5 ■ Communication between microservices 121
6 ■ Creating your production environment 162
7 ■ Getting to continuous delivery 202
8 ■ Automated testing for microservices 233
9 ■ Exploring FlixTube 278
10 ■ Healthy microservices 322
11 ■ Pathways to scalability 358

v

contents
preface xv
acknowledgments xvii
about this book xviii
about the author xxii
about the cover illustration xxiii
1 Why microservices? 1
1.1 This book is practical 2
1.2 What will I learn? 4
1.3 What do I need to know? 5
1.4 Managing complexity 6
1.5 What is a microservice? 6
1.6 What is a microservices application? 7
1.7 What’s wrong with the monolith? 9
1.8 Why are microservices popular now? 11
1.9 Benefits of microservices 12
1.10 Drawbacks of microservices 14
1.11 Modern tooling for microservices 15
1.12 Designing a microservices application 16
1.13 An example application 18
vii
viii CONTENTS
2 Creating your first microservice 20
2.1 New tools 21
2.2 Getting the code 22
2.3 Why Node.js? 22
2.4 Our philosophy of development 24
2.5 Establishing our single-service development environment 27
Installing Git 28 ■ Cloning the code repo 29 ■ Getting Visual
Studio (VS) Code 30 ■ Installing Node.js 30
2.6 Building an HTTP server for video streaming 31
Creating a Node.js project 32 ■ Installing Express 34
Creating the Express boilerplate 37 ■ Running our simple web
server 38 ■ Adding streaming video 39 ■ Configuring our
microservice 41 ■ Setting up for production 44 ■ Live
reloading for fast iteration 45 ■ Running the finished code
from this chapter 48
2.7 Node.js review 49
2.8 Continue your learning 50
3 Publishing your first microservice 51
3.1 New tools 52
3.2 Getting the code 52
3.3 What is a container? 53
3.4 What is an image? 54
3.5 Why Docker? 55
3.6 What are we doing with Docker? 55
3.7 Extending our development environment with Docker 56
Installing Docker 57 ■ Checking your Docker installation 57
3.8 Packaging our microservice 58
Creating a Dockerfile 58 ■ Packaging and checking our Docker
image 60 ■ Booting our microservice in a container 63
3.9 Publishing our microservice 66
Creating a private container registry 67 ■ Pushing our microservice
to the registry 72 ■ Booting our microservice from the registry 76
3.10 Docker review 78
3.11 Continue your learning 80