Chapter 8: Introducing the Legacy Application

In this chapter, we will apply different modernization strategies to an existing legacy application, and use the services provided by Google Cloud to incrementally move from legacy to cloud-native.

This chapter introduces the example application we will be modernizing. We will examine the architecture of the application from an infrastructure and software perspective, and then review important parts of the implementation. This application will be used throughout the book, so it is important that we gain a firm understanding of the application. Once the application has been reviewed, Appendix B presents the modernization strategies that will be used so that we understand how and when to apply them.

In this chapter, we will cover the following:

• The infrastructure architecture
• The software architecture
• The software implementation – configuration
• The software implementation – layers
• Modernization...