Book Image

Modernizing Legacy Applications to Microsoft Azure

By : Steve Read, Larry Mead
Book Image

Modernizing Legacy Applications to Microsoft Azure

By: Steve Read, Larry Mead

Overview of this book

Organizations have varying circumstances, objectives, and prerequisites when contemplating a hyper-scale cloud solution transformation to a platform such as Azure. Modernizing Legacy Applications to Microsoft Azure uncovers potential scenarios and provides choices, methodologies, techniques, and prospective possibilities for transitioning from legacy applications to the Microsoft Azure environment. You’ll start by understanding the legacy systems and the main concerns regarding migration. Then, you’ll investigate why distributed architectures are compelling and the various components of the Azure platform needed during migration. After that, you’ll explore the approaches to modernizing legacy applications and the Rs of modernizing (i.e., rehost, refactor, rearchitect, and retire). You’ll also learn about integration approaches and potential pitfalls. By the end of this book, you’ll be well equipped to modernize your legacy workloads while being aware of pitfalls and best practices.
Table of Contents (18 chapters)
Part 1: Legacy Estate Options
Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
Part 2: Architecture Options
Part 3: Azure Deployment and Future Considerations

Other essential microservices components

We cannot have a chapter on modernizing a monolith without a deeper dive into three substantial topics that you will need to consider in your journey. Let’s look at them.

Azure API Management gateways

An API gateway is an essential part of a design that uses microservices. It is the entry point that lies between clients (such as web browsers and mobile applications) and the microservices that come together to form an application. It is the role of the API gateway to take in requests from users and then forward those requests to the relevant microservices. In essence, it abstracts the applications from the application users. Requests that come in are received by an API gateway, and then that gateway determines which microservice is best suited to handle them depending on the URI or path of the request.

The following is a list of the primary functions of an API gateway:

  • Load balancing: Load balancing is the process by which...