Book Image

Scala Microservices

By : Selvam Palanimalai, Jatin Puri
Book Image

Scala Microservices

By: Selvam Palanimalai, Jatin Puri

Overview of this book

<p>In this book we will learn what it takes to build great applications using Microservices, the pitfalls associated with such a design and the techniques to avoid them. </p><p>We learn to build highly performant applications using Play Framework. You will understand the importance of writing code that is asynchronous and nonblocking and how Play leverages this paradigm for higher throughput. The book introduces Reactive Manifesto and uses Lagom Framework to implement the suggested paradigms. Lagom teaches us to: build applications that are scalable and resilient to failures, and solves problems faced with microservices like service gateway, service discovery, communication and so on. Message Passing is used as a means to achieve resilience and CQRS with Event Sourcing helps us in modelling data for highly interactive applications. </p><p>The book also shares effective development processes for large teams by using good version control workflow, continuous integration and deployment strategies. We introduce Docker containers and Kubernetes orchestrator. Finally, we look at end to end deployment of a set of scala microservices in kubernetes with load balancing, service discovery and rolling deployments. </p><p></p>
Table of Contents (12 chapters)

Example Application in K8s

In the last two chapters, you learned the problems and possible solutions for how to write and run applications in production. Chapter 9, Development Process, focused on processes to do software engineering better, especially in microservices-based architecture. Chapter 10, Production Containers focused on container technology and on how to use it effectively for more development speed and better ratio of cost to usage of infrastructure.

In this final chapter, we will look at how to use what you learned about Kubernetes in Chapter 10, Production Containers, to containerize the Chapter 4, Dive Deeper, example, Talent search engine. The Chapter 4, Dive Deeper example had many microservices (such as auth, Stack Overflow, GitHub, web) working together to find the best developers in a queried city.

We will look at making docker images for each service, push...