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

Writing and managing your own CRs

Let’s start with a simple task. Let’s say that we have a shared RDS instance and we need to create databases in it. Since CloudFormation doesn’t support that out of the box, we will have to develop our CR.

Creating databases in RDS using CRs

We are going to create a CR that will connect to the RDS instance and perform SQL operations on it to create a database, user, password, and necessary privileges in the following steps:

  1. Let’s define our CR, like so:
    // customdb.yamlCustomDb:  Type: Custom::DB  Properties:    ServiceToken: # ARN of Lambda-backed CR    DBName:       # the name of our DB    DBUser:       # the username for our DB    DBPassword:   # the password for our DB's user    RDSEndpoint: ...