Modernizing legacy applications to Microsoft Azure : plan and execute your modernization journey seamlessly / Steve Read, Larry Mead, and Bob Ellsworth.

Format:

Book

Author/Creator:

Read, Steve, author.

Mead, Larry, author.

Ellsworth, Bob, author.

Language:

English

Subjects (All):

Microsoft Azure (Computing platform).

Cloud computing.

Physical Description:

1 online resource (200 pages)

Edition:

1st ed.

Place of Publication:

Birmingham, England : Packt Publishing, [2023]

Biography/History:

Read Steve: Steve has over 36 years experience in the Information Technology industry. He started out in 1986 as a developer in the Banking software industry for IBM Mainframe and Midrange systems. In the 1990's he moved on the AIX and Legacy UNIX systems in the Healthcare and Government industries. After a few years as a freelance trainer and consultant, he joined Microsoft as a Developer Evangelist when Microsoft. NET was launched. He has been in various roles within Microsoft for 23 years. In his current role, he works with Microsoft customers to help them on their Legacy Modernization Journey. Mead Larry: Larry has over 44 years experience in Information Technology that covers legacy platforms such as IBM and Unisys Mainframes, Midrange systems such as IBM iSeries and VMS, and UNIX systems such as AIX, Solaris and HP-UX, Larry has spent the last 27 years working for Microsoft with Microsoft Consulting Services, Corporate Technical Sales, field sales as a Data and Cloud Specialist and in Azure Engineering. At Microsoft, Larry has worked on mission critical projects that require high availability, high resiliency and high volume throughput across multiple industries. Currently, Larry is a thought leader in how to modernize mission critical legacy workloads to Azure.

Summary:

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.

Contents:

Cover

Title Page

Copyright and Credits

Dedications

Foreword

Contributors

Table of Contents

Part 1: Legacy Estate Options

Chapter 1: Understanding Your Legacy Environment - the Modernization Journey

Current legacy hardware and operating system

IBM and Unisys mainframes

IBM Midrange

Enterprise Unix

Other legacy estates

The current state of legacy applications

Scope of the legacy application estate

Languages used in the current estate

Third-party (COTS) applications

Utilities (tools) used by applications

Operating system services

Application-specific SLAs

What are the goals of moving to a hyperscale cloud such as Microsoft Azure?

Cost-related

Application development-related

Hardware-related

The need to choose a target architecture

Azure Landing Zones

Consider your constraints

Time constraints

Resource constraints

Funding constraints

How do you declare success for a legacy modernization to Azure?

Identify the first workload to modernize to Azure

Determine if modernization can be a multi-step process

Establish hybrid and integration requirements

Establish repeatable processes

Summary

Chapter 2: Strategies for Modernizing IBM and Unisys Mainframes

IBM mainframes

z/OS - The most common IBM mainframe operating system

z/VSE - Similar to z/OS, but usually for smaller workloads

z/VM - Z-series virtualization

z/TPF - For high-volume transaction workloads

z/Linux - Linux that can run under z/VM

Specialty engines - IFL and zIIP

Unisys

Libra - From the Burroughs MCP line

Dorado - From the Sperry OS/2200 operating system

Chapter 3: Midrange to Azure

What is a midrange system?

POWER systems

IBM iSeries

OS/400 overview

Applications

Data

Control Language

ISV versus homegrown solutions.

Administration

IBM AIX

AIX overview

AIX versus Linux - what's the difference?

Azure Spring Cloud

COTS applications

Administration

Chapter 4: Modernizing Legacy UNIX Systems

The current UNIX landscape

BSD System 4.3 versus System V

Old UNIX versus modern UNIX

UNIX scripts

Migrating Solaris

SPARC versus x86

Emulation options

Converting to Linux

Converting to PaaS services

Hosting in Azure

Migrating HP-UX

PA-RISC versus Itanium

Converting to Azure PaaS

Other UNIX variants

Part 2: Architecture Options

Chapter 5: An Overview of the Microsoft Azure Cloud Platform

A brief history of Azure

Azure Regions

Azure Stack

Azure compute

Azure storage

Azure networking

Understanding internal Azure networking services

Looking at Azure networking services for connection to on-premises data centers

Azure databases

Azure security and identity

Understanding the Azure approach to hybrid

Deploying and maintaining systems on Azure

Looking at cloud native, serverless computing, and microservices

Chapter 6: Azure Cloud Architecture Overview for Mission-Critical Workloads

What is mission-critical?

Understanding Azure at a high level

Understanding Azure's approach to availability and resiliency

Looking at redundancy in Azure

Looking briefly at Azure SLAs and the nines of availability

Looking at redundancy within a region

Looking at redundancy across regions

Looking at Azure's approach to IaaS

Looking at IaaS for data

Looking at IaaS for applications

Discussing firewalls versus network security groups

Using Azure PaaS features

Looking at database PaaS

Looking at PaaS for applications.

Understanding Azure's features for integration

Understanding Azure features for backup and recovery

Looking at a sample Azure deployment for a mainframe workload

Chapter 7: Behold the Monolith - Pros and Cons of a Monolithic Architecture

What is a monolith?

How did most mainframe applications become monoliths?

What about iSeries and Enterprise UNIX?

What are the monolith's advantages?

What are the monolith's disadvantages?

Why are born-in-the-cloud applications not typically monoliths?

Can you migrate a monolith to Azure?

What if you want to transform a monolith to cloud native?

The tyranny of locality

The database-centric nature of a monolith

The paradigm shift

What makes an application cloud native?

How do microservices fit into the picture?

Decomposition patterns

Part 3: Azure Deployment and Future Considerations

Chapter 8: Exploring Deployment Options in Azure

What exactly do we mean by deployment options?

Good ol' VMs

Benefits

Things to consider

ASF

Azure Functions

Containers

Azure App Service

Chapter 9: Modernization Strategies and Patterns - the Big Picture

Data center exit - how to get to Azure as quickly as possible

Moving to emulators on VMs

Deploying the VMs that use ISV tools

Deploying to containers and PaaS

Redesigning for Azure - completely changing the application

Staged modernization strategy - taking a multi-step approach

Creating a modernization factory approach

Chapter 10: Modernizing the Monolith - Best Practices

Understanding how we got here - the evolution of application development

A deeper dive into microservices

What is the Saga pattern?.

What is the Strangler Fig pattern?

Introducing Dapr

Other essential microservices components

Azure API Management gateways

Event-driven architecture versus traditional batch processing

The rise of Apache Kafka

In modernization, one size does not fit all

Best practices for modernizing the monolith

Chapter 11: Integration - Playing Friendly in a Cloud-Native World

Technical requirements

The role of integration in a cloud-native world

Data integration

Application integration

Monitoring and management integration

Application operations integration

The different types of integration

Integration with the existing legacy estate

Integration with other Azure-based systems

Integration with other clouds

Integration with third-party systems

How integration fits into the bigger picture

Strategies for playing friendly

How to avoid not playing friendly

Chapter 12: Planning for the Future - Trends to Be Aware of

Where we are today

What to expect in the near term

What to expect in the long term

Areas of modernization innovation for Azure

OpenAI and ChatGPT

Azure Arc

Azure Migrate

Azure Data Factory

Azure Logic Apps and Azure Power Apps

Microsoft Fabric

Where do Azure partners fit in?

Where does Microsoft fit in?

The advent of multicloud

Index

Other Books You May Enjoy.

Notes:

Includes index.

Description based on print version record.

ISBN:

9781803238463

1803238461

OCLC:

1396063809