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

Deletion policies

When we create our stack, we need to make sure that mission-critical resources are protected from accidental deletion.

In some cases, this is enabled by EnableTerminationProtection for services such as EC2 and RDS. S3 buckets, when filled with objects, will fail to delete because they have to be emptied first.

Deletion policies allow you to mitigate this risk within CloudFormation. In addition, deletion policies give you a few more features in addition to basic termination protection.

For example, say that you have created a testing stack that you don’t need once the testing phase is finished, but you need the dump of the database (which is actually a snapshot of the RDS instance). Sometimes, you don’t want to recreate the same data structure, or the database already has important data that you want to move to the production environment.

Let’s see whether deletion policies can help us:

Resources:  VeryImportantDb:
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