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

Integration – Playing Friendly in a Cloud-Native World

Let’s start by defining our view on what playing friendly in a cloud-native world means. In a cloud-native world, applications should have the following characteristics related to integration:

  • Published interfaces for other systems to connect
  • Extensible connectors to other systems
  • The ability to scale up and down as needed
  • Offer entry, standard, and premium services to meet customer needs
  • Leverage Platform as a Service (PaaS) capabilities
  • Isolation of services – limited or no cross-services dependency
  • Integration with cloud monitoring services, such as Azure Monitor

The most important features needed for integration to play friendly in a cloud-native world are the published and extensible interfaces (items one and two in the preceding list). These allow your application to integrate with other systems in a prescribed and predictable manner for both incoming and outgoing...