Book Image

The Definitive Guide to Modernizing Applications on Google Cloud

By : Steve (Satish) Sangapu, Dheeraj Panyam, Jason Marston
Book Image

The Definitive Guide to Modernizing Applications on Google Cloud

By: Steve (Satish) Sangapu, Dheeraj Panyam, Jason Marston

Overview of this book

Legacy applications, which comprise 75–80% of all enterprise applications, often end up being stuck in data centers. Modernizing these applications to make them cloud-native enables them to scale in a cloud environment without taking months or years to start seeing the benefits. This book will help software developers and solutions architects to modernize their applications on Google Cloud and transform them into cloud-native applications. This book helps you to build on your existing knowledge of enterprise application development and takes you on a journey through the six Rs: rehosting, replatforming, rearchitecting, repurchasing, retiring, and retaining. You'll learn how to modernize a legacy enterprise application on Google Cloud and build on existing assets and skills effectively. Taking an iterative and incremental approach to modernization, the book introduces the main services in Google Cloud in an easy-to-understand way that can be applied immediately to an application. By the end of this Google Cloud book, you'll have learned how to modernize a legacy enterprise application by exploring various interim architectures and tooling to develop a cloud-native microservices-based application.
Table of Contents (26 chapters)
1
Section 1: Cloud-Native Application Development and App Modernization in Google Cloud
5
Section 2: Selecting the Right Google Cloud Services
10
Section 3: Rehosting and Replatforming the Application
17
Section 4: Refactoring the Application on Cloud-Native/PaaS and Serverless in Google Cloud

Using managed instance groups

As we discussed earlier, a managed instance group is used to create and manage a collection of identical virtual machines, and we will be using one for availability and scalability purposes.

To create our regional managed instance group, follow these steps:

  1. From the cloud console navigation menu, select Compute Engine | Instance groups.

    Figure 10.11 – Navigation menu: Instance groups

  2. On the Instance groups page, click Create instance group.

    Figure 10.12 – Create instance group

  3. Enter the following information as shown in Figure 10.13:
    • Name: tomcat-group.
    • Location: Select Multiple zones.
    • Region: Select europe-west2.
    • Instance template: tomcat-template.
    • Minimum number of instances: 3.

Figure 10.13 – Creating an instance group

  1. At the bottom of the page, click Create.

    In a few minutes, our instance group will have been created and the instances started.

  2. Once the instance group has been created...