Book Image

Cloud Foundry for Developers

By : Rahul Kumar Jain, Rick Farmer, David Wu
Book Image

Cloud Foundry for Developers

By: Rahul Kumar Jain, Rick Farmer, David Wu

Overview of this book

Cloud Foundry is the open source platform to deploy, run, and scale applications. Cloud Foundry is growing rapidly and a leading product that provides PaaS (Platform as a Service) capabilities to enterprise, government, and organizations around the globe. Giants like Dell Technologies, GE, IBM, HP and the US government are using Cloud Foundry innovate faster in a rapidly changing world. Cloud Foundry is a developer’s dream. Enabling them to create modern applications that can leverage the latest thinking, techniques and capabilities of the cloud, including: ? DevOps ? Application Virtualization ? Infrastructure agnosticism ? Orchestrated containers ? Automation ? Zero downtime upgrades ? A/B deployment ? Quickly scaling applications out or in This book takes readers on a journey where they will first learn the Cloud Foundry basics, including how to deploy and scale a simple application in seconds. Readers will build their knowledge of how to create highly scalable and resilient cloud-native applications and microservices running on Cloud Foundry. Readers will learn how to integrate their application with services provided by Cloud Foundry and with those external to Cloud Foundry. Readers will learn how to structure their Cloud Foundry environment with orgs and spaces. After that, we’ll discuss aspects of continuous integration/continuous delivery (CI/CD), monitoring and logging. Readers will also learn how to enable health checks, troubleshoot and debug applications. By the end of this book, readers will have hands-on experience in performing various deployment and scaling tasks. Additionally, they will have an understanding of what it takes to migrate and develop applications for Cloud Foundry.
Table of Contents (20 chapters)
Title Page
Credits
About the Authors
Acknowledgements
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Deep-dive into buildpacks


By now, you may be wondering how buildpacks actually work and how to create/customize your own buildpacks. In order to create/customize buildpacks, we must first understand how they work with Cloud Foundry in the background.

How buildpacks actually work with Cloud Foundry

When a cf push is performed, all application files are uploaded to a blobstore; subsequently, a staging task is created. This staging task is essentially a new container with the application files. The following buildpack process begins by running a series of scripts located in a bin directory containing a number of script files, labeled as detect, compile, and release. These are called, in this order, during the staging process to retrieve the necessary dependencies, build artifacts, and/or configure the application:

Figure 5: The buildpack process

As shown in Figure 5, once application files are uploaded, the process goes on to check whether a buildpack was specified with cf push. If not, the process...