Book Image

Mastering Spring Cloud

By : Piotr Mińkowski
Book Image

Mastering Spring Cloud

By: Piotr Mińkowski

Overview of this book

Developing, deploying, and operating cloud applications should be as easy as local applications. This should be the governing principle behind any cloud platform, library, or tool. Spring Cloud–an open-source library–makes it easy to develop JVM applications for the cloud. In this book, you will be introduced to Spring Cloud and will master its features from the application developer's point of view. This book begins by introducing you to microservices for Spring and the available feature set in Spring Cloud. You will learn to configure the Spring Cloud server and run the Eureka server to enable service registration and discovery. Then you will learn about techniques related to load balancing and circuit breaking and utilize all features of the Feign client. The book now delves into advanced topics where you will learn to implement distributed tracing solutions for Spring Cloud and build message-driven microservice architectures. Before running an application on Docker container s, you will master testing and securing techniques with Spring Cloud.
Table of Contents (22 chapters)
Title Page
Copyright and Credits
Packt Upsell

Spring Cloud Sleuth

Spring Cloud Sleuth is a rather small, simple project, which nevertheless provides some useful features for logging and tracing. If you refer to the example discussed in theUsing LogstashTCPAppender section, you can easily see that there is no possibility to filter all the logs related to single request. In a microservices-based environment, it is also very important to correlate messages exchanged by the applications when handling requests that are coming into the system. This is the main motivation in creating the Spring Cloud Sleuth project.

If Spring Cloud Sleuth is enabled for the application, it adds some HTTP headers to the requests, which allows you to link requests with the responses and the messages exchanged by independent applications, for example, through RESTful API. It defines two basic units of work—span and trace. Each of these is identified by a unique 64 bit ID. The value of the trace ID is equal to the initial value of the span ID. Span refers to a...