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

The current UNIX landscape

The UNIX system was originally developed by Bell Labs over 40 years ago as the first Open Systems operating system. The intent of Bell Labs was to have an underlying operating system kernel and shell that was not tied to specific hardware. To accomplish this, Bell Labs created underlying operating system capabilities and provided hooks to allow specific vendors to adapt UNIX to their hardware. This resulted in similar, but not identical, variants of UNIX offered by the various vendors. This means there is no binary compatibility for applications written on different variants. However, users should be able to recompile applications for a specific variant without a lot of changes. In reality, this is sometimes the case, but not always.

The result is several variants of UNIX that have similar, but not identical, paths to modernize to Azure. The primary variants of UNIX this book will discuss are as follows:

  • AIX: Covered in Chapter 3
  • Solaris: Covered...