Book Image

Mastering AWS CloudFormation

By : Karen Tovmasyan
Book Image

Mastering AWS CloudFormation

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)
1
Section 1: CloudFormation Internals
4
Section 2: Provisioning and Deployment at Scale
9
Section 3: Extending CloudFormation

Chapter 3: Validation, Linting, and Deployment of the Stack

  1. From 9,000 and above.
  2. Linting is the process of evaluating the template against linter rules and is performed by cfn-lint. Validation is performed by CloudFormation and checks whether the template is valid and can be processed by CloudFormation.
  3. There are several steps:

    (a) CloudFormation will check whether the stack exists or not.

    (b) CloudFormation will create a ChangeSet for a new or existing stack.

    (c) CloudFormation will execute the ChangeSet and listen to the stack events.

    (d) If there is a failure, CloudFormation rolls back the changes and informs the user about the issue.

  4. No, ChangeSets must have unique names, otherwise you will get a 400 AlreadyExists error.
  5. The name of the rule file and the rule class must be the same.
  6. Just add the necessary change to the template or parameters and run the stack update.