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Modernizing Legacy Applications to Microsoft Azure

Modernizing Legacy Applications to Microsoft Azure

By : Steve Read, Larry Mead
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Modernizing Legacy Applications to Microsoft Azure

Modernizing Legacy Applications to Microsoft Azure

5 (3)
By: Steve Read, Larry Mead
Buy this Book

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)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Conventions used
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Get in touch
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Share Your Thoughts
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Download a free PDF copy of this book
1
Part 1: Legacy Estate Options
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Part 1: Legacy Estate Options
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2
Chapter 1: Understanding Your Legacy Environment – the Modernization Journey
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Chapter 1: Understanding Your Legacy Environment – the Modernization Journey
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Current legacy hardware and operating system
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The current state of legacy applications
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What are the goals of moving to a hyperscale cloud such as Microsoft Azure?
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The need to choose a target architecture
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Consider your constraints
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How do you declare success for a legacy modernization to Azure?
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Summary
3
Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
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Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes
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IBM mainframes
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Unisys
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Summary
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Chapter 3: Midrange to Azure
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Chapter 3: Midrange to Azure
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What is a midrange system?
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IBM iSeries
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IBM AIX
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Summary
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Chapter 4: Modernizing Legacy UNIX Systems
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Chapter 4: Modernizing Legacy UNIX Systems
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The current UNIX landscape
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Migrating Solaris
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Migrating HP-UX
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Other UNIX variants
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Summary
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Part 2: Architecture Options
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Part 2: Architecture Options
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Chapter 5: An Overview of the Microsoft Azure Cloud Platform
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Chapter 5: An Overview of the Microsoft Azure Cloud Platform
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A brief history of Azure
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Azure Regions
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Azure Stack
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Azure compute
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Azure storage
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Azure networking
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Azure databases
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Azure security and identity
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Understanding the Azure approach to hybrid
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Deploying and maintaining systems on Azure
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Looking at cloud native, serverless computing, and microservices
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Summary
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Chapter 6: Azure Cloud Architecture Overview for Mission-Critical Workloads
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Chapter 6: Azure Cloud Architecture Overview for Mission-Critical Workloads
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What is mission-critical?
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Understanding Azure at a high level
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Understanding Azure’s approach to availability and resiliency
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Looking at Azure’s approach to IaaS
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Discussing firewalls versus network security groups
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Using Azure PaaS features
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Understanding Azure’s features for integration
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Understanding Azure features for backup and recovery
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Looking at a sample Azure deployment for a mainframe workload
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Summary
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Chapter 7: Behold the Monolith – Pros and Cons of a Monolithic Architecture
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Chapter 7: Behold the Monolith – Pros and Cons of a Monolithic Architecture
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What is a monolith?
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How did most mainframe applications become monoliths?
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Why are born-in-the-cloud applications not typically monoliths?
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What if you want to transform a monolith to cloud native?
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Summary
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Part 3: Azure Deployment and Future Considerations
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Part 3: Azure Deployment and Future Considerations
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Chapter 8: Exploring Deployment Options in Azure
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Chapter 8: Exploring Deployment Options in Azure
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What exactly do we mean by deployment options?
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Good ol’ VMs
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ASF
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Azure Functions
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Containers
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Azure App Service
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Azure Stack
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Summary
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Chapter 9: Modernization Strategies and Patterns – the Big Picture
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Chapter 9: Modernization Strategies and Patterns – the Big Picture
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Data center exit – how to get to Azure as quickly as possible
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Redesigning for Azure – completely changing the application
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Staged modernization strategy – taking a multi-step approach
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Summary
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Chapter 10: Modernizing the Monolith - Best Practices
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Chapter 10: Modernizing the Monolith - Best Practices
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Understanding how we got here – the evolution of application development
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A deeper dive into microservices
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What is the Saga pattern?
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What is the Strangler Fig pattern?
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Introducing Dapr
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Other essential microservices components
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In modernization, one size does not fit all
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Best practices for modernizing the monolith
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Summary
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Chapter 11: Integration – Playing Friendly in a Cloud-Native World
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Chapter 11: Integration – Playing Friendly in a Cloud-Native World
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Technical requirements
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The role of integration in a cloud-native world
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The different types of integration
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How integration fits into the bigger picture
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Summary
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Chapter 12: Planning for the Future – Trends to Be Aware of
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Chapter 12: Planning for the Future – Trends to Be Aware of
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Where we are today
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What to expect in the near term
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What to expect in the long term
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Areas of modernization innovation for Azure
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Where do Azure partners fit in?
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Where does Microsoft fit in?
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The advent of multicloud
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Summary
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Index
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Index
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Why subscribe?
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Other Books You May Enjoy
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Other Books You May Enjoy
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Packt is searching for authors like you
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Share Your Thoughts
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Understanding Your Legacy Environment – the Modernization Journey

Before you choose the right option to move your legacy estate to a hyperscale cloud provider such as Azure, you need to understand the current environment of your legacy estate to know the options that might exist. This chapter will focus on the areas you should consider. Also, while many of the concepts that we will discuss can be applied to other hyperscale clouds, this book will focus on Azure. So, let’s start with a list of topics that we will cover in this chapter to help you understand your current legacy estate:

  • Current legacy hardware and operating system
  • The current state of legacy applications
  • What are the goals of moving to a hyperscale cloud such as Microsoft Azure?
  • The need to choose a target architecture
  • Consider your constraints
  • How do you declare success for a legacy modernization to Azure?

Having been involved in many modernizations of legacy environments to Azure, understanding these fundamentals will both increase the likelihood of a successful modernization and provide you with an Azure estate that exceeds the capabilities of your current legacy environment.

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