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 Stack

One of the most consistent issues that you will need to consider when you are modernizing your legacy workloads is network latency. The latency between the on-premises data center and the Azure Region can sometimes be unacceptable even when using a technology such as ExpressRoute, which we looked at earlier in the book in Chapter 6. When you encounter this issue, you will need to look at Azure Stack. Azure Stack contains many of the essential Azure resources (especially IaaS) that you will need in an on-premises deployable instance. It is offered by hardware vendors and provides many of the benefits of Azure, but not all of them. You will need to see which services you intend to use to make sure that Azure Stack is the solution you need. As of the writing of this book, it comes in three flavors. Let’s take a look at them:

  • Azure Stack HCI: Azure Stack HCI is a hyper-converged infrastructure (HCI) for running Platform as a Service (PaaS)- and IaaS-based workloads...