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 App Service

As we mentioned, we already looked at the component of Azure App Service that allows you to run containers, Azure Web App for Containers. Azure App Service also allows you to run non-container-based applications as well. It is a great service for running .NET, .NET Core, Node.js, Java, Python, and PHP web-based applications. For any given legacy installation, there is typically a service facade built around it on-premises that supports things such as external access to CICS transactions, a web-based UI for interacting with Db2 or Virtual Storage Access Method (VSAM), and also applications that need to integrate with the mainframe and/or legacy estate. These types of applications are good candidates for Azure App Service. As you would guess, it is fully managed and cloud native. You do not need to worry about standing up the VM and OS. Azure handles all of that for you. You literally bring your applications and they just run. It has built-in scalability and resilience...