cloudformation

1# AWS CloudFormation
2 
3AWS CloudFormation provisions and manages AWS resources using templates. Define infrastructure as code, version control it, and deploy consistently across environments.
4 
5## Table of Contents
6 
7- [Core Concepts](#core-concepts)
8- [Common Patterns](#common-patterns)
9- [CLI Reference](#cli-reference)
10- [Best Practices](#best-practices)
11- [Troubleshooting](#troubleshooting)
12- [References](#references)
13 
14## Core Concepts
15 
16### Templates
17 
18JSON or YAML files defining AWS resources. Key sections:
19- **Parameters**: Input values
20- **Mappings**: Static lookup tables
21- **Conditions**: Conditional resource creation
22- **Resources**: AWS resources (required)
23- **Outputs**: Return values
24 
25### Stacks
26 
27Collection of resources managed as a single unit. Created from templates.
28 
29### Change Sets
30 
31Preview changes before executing updates.
32 
33### Stack Sets
34 
35Deploy stacks across multiple accounts and regions.
36 
37## Common Patterns
38 
39### Basic Template Structure
40 
41```yaml
42AWSTemplateFormatVersion: '2010-09-09'
43Description: My infrastructure template
44 
45Parameters:
46  Environment:
47    Type: String
48    AllowedValues: [dev, staging, prod]
49    Default: dev
50 
51Mappings:
52  EnvironmentConfig:
53    dev:
54      InstanceType: t3.micro
55    prod:
56      InstanceType: t3.large
57 
58Conditions:
59  IsProd: !Equals [!Ref Environment, prod]
60 
61Resources:
62  MyBucket:
63    Type: AWS::S3::Bucket
64    Properties:
65      BucketName: !Sub 'my-app-${Environment}-${AWS::AccountId}'
66      VersioningConfiguration:
67…