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 networking

The Azure platform implements what is known as software-defined networking for the majority of the Azure fleet. This differs from Azure dedicated, where your workloads can actually be running on non-virtualized hardware. For the rest of this section, we will not address non-virtual implementations since you are probably already familiar with them.

An entire book could be devoted to Azure networking, but for the purposes of this book, we will focus on the key aspects that you need to be aware of on your modernization journey. They can broadly be thought of in two categories, as follows:

  • Services that run in Azure
  • Services that connect Azure to your on-premises data center

Let’s start with those that are within Azure first.

Understanding internal Azure networking services

Let us take a look at Azure’s internal networking services:

  • Azure Virtual Network: An Azure Virtual Network is the most fundamental component of your...