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Microservices Development Cookbook
Microservices Development Cookbook

Microservices Development Cookbook: Design and build independently deployable modular services

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Microservices Development Cookbook

Edge Services

In this chapter, we will cover the following recipes:

  • Controlling access to your service with an edge proxy server
  • Extending your services with sidecars
  • Using API Gateway to route requests to services
  • Rate limiting with an edge proxy server
  • Stopping cascading failure with Hystrix
  • Using a service mesh to factor out shared concerns

Introduction

Now that you've had some experience breaking a monolith into microservices, you've seen that many of the challenges exist outside the monolith or service code bases themselves. Exposing your service to the internet, controlling routing, and building in resiliency are all concerns that can be addressed by what are commonly called edge services. These are services that exist at the edge of our architecture, generally handling requests from the public internet. Luckily, because many of these challenges are so common, open source projects exist to handle most of them for us. We'll use a lot of great open source software in this chapter.

With the recipes in this chapter, you'll learn how to use open source software to expose your services to the public internet, control routing, extend your service's functionality, and handle a number of common...

Controlling access to your service with an edge proxy server

In Chapter 1, Breaking the Monolith, we modified a monolith code base to provide easy routing to our microservices. This approach works and requires little effort, making it an ideal intermediary step. Eventually, your monolith will become a bottleneck in the development and resiliency of your architecture. As you try to scale your service and build more microservices, your monolith will need to be updated and deployed every time you make an API change to your service. Additionally, your monolith will have to handle connections to your services and is probably not well-configured to handle edge concerns such as load shedding or circuit breaking. In the Routing requests to services recipe of Chapter 1, Breaking the Monolith, we introduced the concept of edge proxies. Using an edge proxy server to expose your service...

Extending your services with sidecars

When you start developing microservices, it's common to embed a certain amount of boilerplate into each service. Logging, metrics, and configuration are all functionalities that are commonly copied from service to service, resulting in a large amount of boilerplate and copied and pasted code. As your architecture grows and you develop more services, this kind of setup becomes harder and harder to maintain. The usual result is that you end up with a bunch of different ways of doing logging, metrics, service discovery, and so on, which results in systems that are hard to debug and maintain. Changing something as simple as a metrics namespace or adding a feature to your service discovery clients can require the coordination of multiple teams and code bases. More realistically, your microservices architecture will continue to grow with inconsistent...

Using API Gateways for routing requests to services

As we've seen in other recipes, microservices should provide a specific business capability and should be designed around one or more domain concepts, surrounded by a bounded context. This approach to designing service boundaries works well to guide you toward simple, independently-scalable services that can be managed and deployed by a single team dedicated to a certain area of your application or business. 

When designing user interfaces, clients often aggregate related but distinct entities from various backend microservices. In our fictional messaging application, for instance, the screen that shows an actual message might have information from a message service, a media service, a likes service, a comments service, and so on. All of this information can be cumbersome to collect and can result in a large number...

Stopping cascading failures with Hystrix

Failures in a complex system can be hard to diagnose. Often, the symptom can appear far away from the cause. Users might start experiencing higher-than-normal error rates during login because of some downstream service that manages profile pictures or something else tangentially related to user profiles. An error in one service can often propagate needlessly to a user request and adversely impact user experience and therefore trust in your application. Additionally, a failing service can have cascading effects, turning a small system outage into a high-severity, customer-impacting incident. It's important when designing microservices to consider failure isolation and decide how you want to handle different failure scenarios.

A number of patterns can be used to improve the resiliency of distributed systems. Circuit breakers are a common...

Rate limiting

In addition to techniques such as circuit breaking, rate limiting can be an effective way to prevent cascading failures in a distributed system. Rate limiting can be effective at preventing spam, protecting against Denial of Service (DoS) attacks, and protecting parts of a system from becoming overloaded by too many simultaneous requests. Typically implemented as either a global or per-client limit, rate limiting is usually part of a proxy or load balancer. In this recipe, we'll use NGINX, a popular open source load balancer, web server, and reverse proxy.

Most rate-limiting implementations use the leaky-bucket algorithm—an algorithm that originated in computer network switches and telecommunications networks. As the name suggests, the leaky-bucket algorithm is based on the metaphor of a bucket with a small leak in it that controls a constant rate. Water...

Using service mesh for shared concerns

As web services' frameworks and standards evolve, the amount of boilerplate or shared application concerns is reduced. This is because, collectively, we figure out what parts of our applications are universal and therefore shouldn't need to be re-implemented by every programmer or team. When people first started networking computers, programmers writing network-aware applications had to worry about a lot of low-level details that are now abstracted out by the operating system's networking stack. Similarly, there are certain universal concerns that all microservices share. Frameworks such as Twitter's Finagle wrap all network calls in a circuit breaker, increasing fault tolerance and isolating failures in systems. Finagle and Spring Boot, the Java framework we've been using for most of these recipes, both support exposing...

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Key benefits

  • Get to grips with microservice architecture to build enterprise-ready applications
  • Adopt best practices to find solutions to specific problems
  • Monitor and manage your services in production

Description

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.

Who is this book for?

Microservice Development Cookbook is for developers who want to build effective and scalable microservices. Basic knowledge of microservices architecture is assumed.

What you will learn

  • Learn how to design microservice-based systems
  • Develop services that do not impact users during failures
  • Monitor your services to perform debugging and create observable systems
  • Manage the security of your services
  • Create fast and reliable deployment pipelines
  • Manage multiple environments for your services
  • Simplify the local development of microservice-based systems
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Publication date : Aug 31, 2018
Length: 260 pages
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Language : English
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Table of Contents

10 Chapters
Breaking the Monolith Chevron down icon Chevron up icon
Edge Services Chevron down icon Chevron up icon
Inter-service Communication Chevron down icon Chevron up icon
Client Patterns Chevron down icon Chevron up icon
Reliability Patterns Chevron down icon Chevron up icon
Security Chevron down icon Chevron up icon
Monitoring and Observability Chevron down icon Chevron up icon
Scaling Chevron down icon Chevron up icon
Deploying Microservices Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Mattia Gheda Nov 14, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you’ve felt the pain of maintaining a monolith but are not sure on how to get started with your move to microservices, then you should read this book.Using a practical approach, each chapter guides the reader through the steps and caveats that building an application based on microservices presents. Code samples included.
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