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

Structured JSON logging


Outputting useful logs is a key part of building an observable service. What constitutes a useful log is subjective, but a good set of guidelines is that logs should contain timestamped information about key events in a system. A good logging system supports the notion of configurable log levels, so the amount of information sent to logs can be dialed up or down for a specific amount of time depending on the needs of engineers working with the system. For example, when testing a service against failure scenarios in production, it may be useful to turn up the log level and get more detail about events in the system.

 

The two most popular logging libraries for Java applications are Log4j (https://logging.apache.org/log4j/2.x/) and Logback (https://logback.qos.ch/). By default, both of these libraries will emit log entries in an unstructured format, usually space-separated fields including information such as a timestamp, log level, and message. This is useful, but especially...