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

Distributed tracing with Sleuth

Another one of Spring Cloud's essential functionalities is distributed tracing. It is implemented in the Spring Cloud Sleuth library. Its primary purpose is to associate subsequent requests dispatched between different microservices under processing single input request. As in most cases, these are HTTP requests that implement tracing mechanisms based on HTTP headers. The implementation is built over Slf4j and MDC. Slf4j provides facade and abstraction for specific logging frameworks such as logback, log4j, or java.util.logging. MDC or mapped diagnostic context in full, is a solution for distinguishing log output from different sources and enriching them with additional information that could be not available in the actual scope.

Spring Cloud Sleuth adds trace and span IDs to the Slf4J MDC, so that we are able to extract all of the logs with a given trace or span. It also adds some other entries such as application name or exportable flag. It integrates with...