CloudFormation

Deploy AWS infrastructure with native CloudFormation templates.

Template Structure

AWSTemplateFormatVersion: '2010-09-09' Description: Web application stack

Parameters: Environment: Type: String AllowedValues: [dev, staging, prod]

Resources: WebServer: Type: AWS::EC2::Instance Properties: ImageId: !Ref AMI InstanceType: t3.micro Tags: - Key: Name Value: !Sub '${Environment}-web'

Outputs: InstanceId: Value: !Ref WebServer Export: Name: !Sub '${Environment}-WebServerId'

Stack Operations

Create stack

aws cloudformation create-stack
--stack-name myapp
--template-body file://template.yaml
--parameters ParameterKey=Environment,ParameterValue=prod

Update stack

aws cloudformation update-stack
--stack-name myapp
--template-body file://template.yaml

Delete stack

aws cloudformation delete-stack --stack-name myapp

Detect drift

aws cloudformation detect-stack-drift --stack-name myapp

Intrinsic Functions

Reference

!Ref MyResource

Get attribute

!GetAtt MyResource.Arn

Substitute

!Sub 'arn:aws:s3:::${BucketName}/*'

Conditional

!If [CreateProdResources, 't3.large', 't3.micro']

Join

!Join ['-', [!Ref Environment, 'app', 'bucket']]

Best Practices

Use change sets before updates
Implement stack policies
Use nested stacks for modularity
Enable termination protection
Use cfn-lint for validation

Related Skills

terraform-aws - Alternative IaC
aws-iam - IAM resources

cloudformation

Safety Notice

Copy this and send it to your AI assistant to learn