cloudformation

# AWS CloudFormation AWS CloudFormation provisions and manages AWS resources using templates. Define infrastructure as code, version control it, and deploy consistently across environments. ## Table of Contents - [Core Concepts](#core-concepts) - [Common Patterns](#common-patterns) - [CLI Reference](#cli-reference) - [Best Practices](#best-practices) - [Troubleshooting](#troubleshooting) - [References](#references) ## Core Concepts ### Templates JSON or YAML files defining AWS resources. Key sections: - **Parameters**: Input values - **Mappings**: Static lookup tables - **Conditions**: Conditional resource creation - **Resources**: AWS resources (required) - **Outputs**: Return values ### Stacks Collection of resources managed as a single unit. Created from templates. ### Change Sets Preview changes before executing updates. ### Stack Sets Deploy stacks across multiple accounts and regions. ## Common Patterns ### Basic Template Structure ```yaml AWSTemplateFormatVersion: '2010-09-09' Description: My infrastructure template Parameters: Environment: Type: String AllowedValues: [dev, staging, prod] Default: dev Mappings: EnvironmentConfig: dev: InstanceType: t3.micro prod: InstanceType: t3.large Conditions: IsProd: !Equals [!Ref Environment, prod] Resources: MyBucket: Type: AWS::S3::Bucket Properties: BucketName: !Sub 'my-app-${Environment}-${AWS::AccountId}' VersioningConfiguration: Status: !...