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

Behold the Monolith – Pros and Cons of a Monolithic Architecture

We will look at monolithic systems in this chapter since most mainframe applications were developed for this type of environment. Currently, there are trends to move away from monolithic architecture in the cloud. However, the monolith approach served a purpose. We will look at whether a monolithic system should be redesigned for the cloud or whether you should host the monolith in Azure, which is also an option.

This chapter covers the following topics:

  • What is a monolith?
  • How did most mainframe applications become monoliths?
  • Why are born-in-the-cloud applications not typically monoliths?
  • What if you want to transform a monolith to cloud native?