Each Rackspace account can house one or more AWS accounts. By default, you can create up to five new AWS accounts via the Fanatical Support for AWS Control Panel. If you need more than five accounts, please open a ticket to request a limit increase. In addition to creating new AWS accounts, you may also transfer existing AWS accounts to Rackspace for management.
Each AWS account provides a top-level administrative control boundary for the resources that are a part of it. While it is possible to leverage Amazon's Identity and Access Management (IAM) platform to isolate certain resource access, we typically recommend provisioning an AWS account per application deployment phase (e.g. development, staging, and production), thereby allowing you to assign different users in your organization access to one or more of the accounts without complex IAM policies. In this example, developers could be granted access to provision EC2 instances, RDS databases, etc. in your development and staging accounts, but be restricted to read access of the resources in your production account.
In addition to being a strong permission boundary, AWS accounts also provide a convenient construct for tracking expenses, since by default, both AWS and Rackspace charges are grouped by AWS account. For example, if 4 separate AWS accounts are used called app1-dev, app1-prod, app2-dev, app2-prod, it is very easy to see how much is being spent on each application environment. We highly encourage the use of tagging for more fine grained tracking of expenses within accounts, but tagging is more complicated, certain resources may be missing tags resulting in unallocated cost, and not all AWS resource types support tagging. AWS accounts provide a great default cost allocation construct.
Lastly, using separate AWS accounts per environment gives you the flexibility to select different Rackspace service levels for each environment, since Rackspace service levels are applied at the AWS account level. For example, you may opt for the Navigator service level on your development account while using the Aviator service level for your production environment.
As is described later in this document, several Fanatical Support for AWS features (such as Rackspace Logbook) are available in both cross-account and account-specific views, enabling unified visibility across multiple AWS accounts.