These are the different ways to share S3 buckets across accounts:
- You can create a cross-account IAM role, which allows another AWS account to assume that role and gain access to the S3 bucket. This approach works well when you need to offer precise control over access, like read-only permissions or access to a specific folder within the S3 bucket.
- You can create a bucket policy that allows another AWS account to access your S3 bucket. This approach is beneficial when you want to provide wide access to the S3 bucket, such as the ability to read and write all objects within it.
- By using S3 Access Points, you can create access points and shareable S3 buckets. Access points enable you to set precise permissions and network controls for shared access. This approach is useful when you want to share specific portions of the S3 bucket with other accounts.
- If you have multiple AWS accounts organized under AWS organizations, you can utilize the AWS Resource Access Manager (RAM) service to share S3 bucket across those accounts. This approach permits you to share resources between accounts without creating IAM roles or bucket policies.
