Mastering Multi-Account and Multi-Region Resource Sharing

Operating in the cloud at scale often involves managing dozens or hundreds of AWS accounts and multiple geographic regions. This guide focuses on the tools and strategies used to provision and share resources efficiently across these boundaries.

Learning Objectives

By the end of this module, you will be able to:

• Configure AWS Resource Access Manager (RAM) to share specific AWS resources across accounts.
• Deploy CloudFormation StackSets to automate infrastructure provisioning across multiple regions and accounts simultaneously.
• Implement Cross-Account IAM Roles to grant secure access to resources in different accounts.
• Establish S3 Cross-Region Replication (CRR) for data redundancy and compliance.
• Identify use cases for different sharing mechanisms based on organizational requirements.

Key Terms & Glossary

• Principal: The entity (AWS account, IAM user, or role) that receives permissions to access shared resources.
• Resource Share: A container in AWS RAM that defines which resources are being shared and who the principals are.
• StackSet: A CloudFormation entity that lets you create stacks in AWS accounts across regions by using a single template.
• Stack Instance: A reference to a stack in a target account and region within a StackSet.
• Trusted Access: A setting in AWS Organizations that allows AWS services (like RAM or CloudFormation) to perform tasks on your behalf across the organization.
• Drift Detection: A feature that identifies when a stack's actual configuration differs from its template definition.

The "Big Idea"

As organizations grow, they move from a single-account