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AWS Multi-Account IaC Sandwich: Terragrunt, Terraform, CloudFormation
- The article discusses creating a secure AWS multi-account management approach using Terraform, Terragrunt, and AWS CloudFormation StackSets.
- It highlights the need for central IAM role provisioning across AWS accounts for infrastructure automation with strict security controls.
- The solution involves CloudFormation StackSets for pre-provisioning IAM roles before using Terraform/Terragrunt for infrastructure deployment.
- The article emphasizes a GitOps folder-based approach for environment structuring and role assumption using a layered strategy.
- Key aspects include the structured IaC setup with organization-level management, environment-specific infrastructure, and shared variables.
- The Terragrunt pathing pattern follows a structured model for environment-specific modules.
- IAM roles are provisioned using CloudFormation StackSets, ensuring secure role assumption across different AWS Organizational Units.
- Environment-specific configurations are managed in infrastructure-live, dynamically mapping account settings for seamless role assumption.
- Terragrunt's DRY approach allows dynamic mapping of environments and automatic IAM role assumption based on folder structures.
- Executing Terraform/Terragrunt involves assuming the correct IAM role for infrastructure provisioning and following best practices for security.
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