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Mastering AWS CloudFormation

Mastering AWS CloudFormation

By : Karen Tovmasyan
4.2 (5)
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Mastering AWS CloudFormation

Mastering AWS CloudFormation

4.2 (5)
By: Karen Tovmasyan

Overview of this book

DevOps and the cloud revolution have forced software engineers and operations teams to rethink how to manage infrastructures. With this AWS book, you'll understand how you can use Infrastructure as Code (IaC) to simplify IT operations and manage the modern cloud infrastructure effectively with AWS CloudFormation. This comprehensive guide will help you explore AWS CloudFormation from template structures through to developing complex and reusable infrastructure stacks. You'll then delve into validating templates, deploying stacks, and handling deployment failures. The book will also show you how to leverage AWS CodeBuild and CodePipeline to automate resource delivery and apply continuous integration and continuous delivery (CI/CD) practices to the stack. As you advance, you'll learn how to generate templates on the fly using macros and create resources outside AWS with custom resources. Finally, you'll improve the way you manage the modern cloud in AWS by extending CloudFormation using AWS serverless application model (SAM) and AWS cloud development kit (CDK). By the end of this book, you'll have mastered all the major AWS CloudFormation concepts and be able to simplify infrastructure management.
Table of Contents (17 chapters)
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1
Section 1: CloudFormation Internals
4
Section 2: Provisioning and Deployment at Scale
9
Section 3: Extending CloudFormation

Understanding the internals of AWS CloudFormation

AWS services consist of three parts:

  • API
  • Backend
  • Storage

We interact with AWS by making calls to its API services. If we want to create an EC2 instance, then we need to perform a call, ec2:RunInstances.

When we develop our template and create a stack, we invoke the cloudformation:CreateStack API method. AWS CloudFormation will receive the command along with the template, validate it, and start creating resources, making API calls to various AWS services, depending on what we have declared for it.

If the creation of any resource fails, then CloudFormation will roll back the changes and delete the resources that were created before the failure. But if there are no mistakes during the creation process, we will see our resources provisioned across the account.

If we want to make changes to our stack, then all we need to do is update the template file and invoke the cloudformation:UpdateStack API method. CloudFormation will then update only those resources that have been changed. If the update process fails, then CloudFormation will roll the changes back and return the stack to the previous, healthy, state.

Now that we have this covered, let's start creating our stack.

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