Book Image

Mastering AWS CloudFormation - Second Edition

By : Karen Tovmasyan
Book Image

Mastering AWS CloudFormation - Second Edition

By: Karen Tovmasyan

Overview of this book

The advent of DevOps and the cloud revolution has compelled software engineers and operations teams to rethink how to manage complex infrastructures and build resilient solutions. With this AWS book, you’ll find out how you can use Infrastructure as Code (IaC) to simplify infrastructure operations and manage the modern cloud with AWS CloudFormation. This guide covers AWS CloudFormation comprehensively, from template structures to developing complex and reusable infrastructure stacks. It takes you through template validation, stack deployment, and handling deployment failures. It also demonstrates the use of AWS CodeBuild and CodePipeline for automating resource delivery and implementing continuous integration and continuous delivery (CI/CD) practices. As you advance, you’ll learn how to modularize and unify your template on the fly using macros or by fixating the version using modules. You’ll create resources outside of AWS with custom resources and catalog them with the CloudFormation registry. Finally, you’ll improve the way you manage the modern cloud environment on AWS by extending CloudFormation through the AWS serverless application model (SAM) and the AWS cloud development kit (CDK). By the end of this book, you’ll have mastered key AWS CloudFormation concepts and will be able to extend its capabilities for developing and deploying your own infrastructure.
Table of Contents (19 chapters)
Free Chapter
1
Part 1: CloudFormation Internals
4
Part 2: Provisioning and Deployment at Scale
9
Part 3: Extending CloudFormation

Preventing failures of multiple StackSet deployments using TAGs

When we want to deploy StackSets where stack instances in one StackSet depend on the stack instances in another, then we need to make sure that these deployments do not fail.

Although there is a failure-tolerance option in implementing StackSet operations, we need to catch and handle all possible exceptions before the actual operation.

StackSets have an optional feature called a TAG. A TAG is a Lambda function that is executed on a target account before a StackSet operation and checks whether a target account is ready to perform this operation—for example, if the required resources exist or if there is no other ongoing StackSet operation.

TAGs must be developed by us, but their outcome is quite simple: if all checks pass, then it should return SUCCESS, or FAIL if one or more checks do not pass.

For this chapter, we will develop a TAG function that will check the following:

  • Whether a core stack...