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

Azure compute

When we talk about Azure compute, we need to look at and consider the various forms and offerings in which Azure makes compute available. At its most basic level, compute refers to the CPU capacity available for running your applications. It starts to get interesting when we find that we need to leverage cloud features such as the ability to scale on demand. Or, do we want to move away from standard VMs and more toward Docker containers, offered in Azure Kubernetes Service (AKS) or Azure Container Instances (ACI)?

These are all extremely important questions that you will need to consider when you are planning your migration.

The best way to do this is to provide a quick rundown on the types of compute offerings that are available in Azure, but before we do that, let’s talk about the types of compute CPUs available. It would be easy to get into the weeds on this topic, so I will keep it brief. Essentially, Azure runs many different forms of x86 vCPUs. When...