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

Modernization Strategies and Patterns – the Big Picture

The strategy, or strategies, available for you to modernize a legacy system to Azure will largely depend on your goals for running the system you wish to migrate. We will discuss in detail the following four migration goals, and what strategies might work best for each type of goal:

  • Exiting the existing data center as quickly as possible
  • Taking a multi-step (staged) approach
  • Modernizing to a cloud-native infrastructure
  • Redesigning the system for Azure

Each category will likely have more than one modernization strategy available. It’s up to you to pick the best approach for your situation.

This chapter will cover the following topics:

  • Data center exit – how to get to Azure as quickly as possible
  • Redesigning for Azure – completely changing the application
  • Staged modernization strategy – taking a multi-step approach

Let’s start with the...