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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

Validating the template

Whenever we execute aws cloudformation create-stack (or update-stack), CloudFormation will first validate the template, checking whether it is a valid JSON or YAML file (a syntax check) and whether there are any critical issues, such as circular dependencies.

Although template validation is a necessary step before stack deployment, there are many things that will break stack deployment even if validation succeeds:

  • Missing required resource properties
  • Syntax errors and typos in resource property names
  • Non-existent resource property values

We could continue with this list, but let's move from theory to practice.

The command that runs template validation is straightforward:

$ aws cloudformation validate-template --template-body file://path_to_your_template

For example, if we want to validate our core template, we need to run the following command:

$ aws cloudformation validate-template --template-body file://core.yaml...

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