Book Image

Microservices Development Cookbook

By : Paul Osman
Book Image

Microservices Development Cookbook

By: Paul Osman

Overview of this book

Microservices have become a popular choice for building distributed systems that power modern web and mobile apps. They enable you to deploy apps as a suite of independently deployable, modular, and scalable services. With over 70 practical, self-contained tutorials, the book examines common pain points during development and best practices for creating distributed microservices. Each recipe addresses a specific problem and offers a proven, best-practice solution with insights into how it works, so you can copy the code and configuration files and modify them for your own needs. You’ll start by understanding microservice architecture. Next, you'll learn to transition from a traditional monolithic app to a suite of small services that interact to ensure your client apps are running seamlessly. The book will then guide you through the patterns you can use to organize services, so you can optimize request handling and processing. In addition this, you’ll understand how to handle service-to-service interactions. As you progress, you’ll get up to speed with securing microservices and adding monitoring to debug problems. Finally, you’ll cover fault-tolerance and reliability patterns that help you use microservices to isolate failures in your apps. By the end of this book, you’ll have the skills you need to work with a team to break a large, monolithic codebase into independently deployable and scalable microservices.
Table of Contents (16 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Server-side load balancing


When thinking about distributing load across a cluster of servers running instances of an application, it's interesting to consider a brief (and incomplete) history of web application architectures. Some of the earliest web applications were static HTML pages hosted by a web server, such as Apache or similar web server daemon software. Gradually, applications became more dynamic, using technologies such as server-side scripts executed through CGI. Even dynamic applications were still files hosted and served directly by a web server daemon. This simple architecture worked for a long time. Eventually, however, as the amount of traffic an application received grew, a way to distribute load among identical stateless instances of an application was needed.

There are a number of techniques for load balancing, including round-robin DNS or DNS geolocation. The simplest and most common form of load balancing for microservices is to use a software program that forwards requests...