You're reading from Mastering AWS CloudFormation Plan, develop, and deploy your cloud infrastructure effectively using AWS CloudFormation

Product type Paperback

Published in May 2020

Publisher Packt

ISBN-13 9781789130935

Length 300 pages

Edition 1st Edition

Tools

AWS

Concepts

Infrastructure Management

Author (1):

Karen Tovmasyan

View More author details

Table of Contents (17) Chapters

Preface

1. Section 1: CloudFormation Internals

2. CloudFormation Refresher FREE CHAPTER

3. Advanced Template Development

4. Section 2: Provisioning and Deployment at Scale

5. Validation, Linting, and Deployment of the Stack

6. Continuous Integration and Deployment

7. Deploying to Multiple Regions and Accounts Using StackSets

8. Configuration Management of the EC2 Instances Using cfn-init

9. Section 3: Extending CloudFormation

10. Creating Resources outside AWS Using Custom Resources

11. Dynamically Rendering the Template Using Template Macros

12. Generating CloudFormation Templates Using AWS CDK

13. Deploying Serverless Applications Using AWS SAM

14. What's Next?

15. Assessments

16. Other Books You May Enjoy

Leave a review - let other readers know what you think

Understanding custom resources

When we declare a resource in a CloudFormation template, we provide a Type attribute. This attribute declares a service and a resource that is going to be created—this means that CloudFormation understands where to go, what to do, and which API calls to make. The AWS is a main namespace (for example, provider), and what comes after AWS is another namespace, declaring the service. If it's EC2, then CloudFormation will send calls to EC2's API. If it's RDS, then it sends calls to RDS's API. The last block is the actual resource we want to create.

Custom resources (CRs) are the resources that don't fall under the official support of CloudFormation. These can be external providers, internal or self-hosted systems, or even services that don't support CloudFormation yet. The creation of CRs is usually a contract with three counteragents—the template developer, CR provider, and CloudFormation. While the template...