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)
1
Part 1: Legacy Estate Options
3
Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
6
Part 2: Architecture Options
10
Part 3: Azure Deployment and Future Considerations

Understanding Azure at a high level

To achieve a well-architected mission-critical system, the best way to think about the Azure platform is as a collection of computing, storage, and networking components that can be consumed in several different ways, such as IaaS, PaaS, and Software as a Service (SaaS). So, you can approach creating a mission-critical architecture just as you would if you were creating a highly available system on-premises, with only a few exceptions primarily related to having a public cloud versus a private cloud.

You might have heard the expression from Microsoft that Azure is the world’s computer, and in many ways, this is true since it is composed of foundational services grouped into compute, networking, and storage. So, to make a system able to support mission-critical workloads, we have to make sure we put the right components together and leverage the native services within Azure that allow this. A key point to understand is that Azure was designed...