Work with shared Capacity Reservations
Capacity Reservation sharing enables Capacity Reservation owners to share their reserved capacity with other Amazon accounts or within an Amazon organization. This enables you to create and manage Capacity Reservations centrally, and share the reserved capacity across multiple Amazon accounts or within your Amazon organization.
In this model, the Amazon account that owns the Capacity Reservation (owner) shares it with other Amazon accounts (consumers). Consumers can launch instances into Capacity Reservations that are shared with them in the same way that they launch instances into Capacity Reservations that they own in their own account. The Capacity Reservation owner is responsible for managing the Capacity Reservation and the instances that they launch into it. Owners cannot modify instances that consumers launch into Capacity Reservations that they have shared. Consumers are responsible for managing the instances that they launch into Capacity Reservations shared with them. Consumers cannot view or modify instances owned by other consumers or by the Capacity Reservation owner.
A Capacity Reservation owner can share a Capacity Reservation with:
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Specific Amazon accounts inside or outside of its Amazon organization
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An organizational unit inside its Amazon organization
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Its entire Amazon organization
Prerequisites for sharing Capacity Reservations
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To share a Capacity Reservation, you must own it in your Amazon account. You cannot share a Capacity Reservation that has been shared with you.
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You can only share Capacity Reservations for shared tenancy instances. You cannot share Capacity Reservations for dedicated tenancy instances.
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Capacity Reservation sharing is not available to new Amazon accounts or Amazon accounts that have a limited billing history.
To share a Capacity Reservation with your Amazon organization or an organizational unit in your Amazon organization, you must enable sharing with Amazon Organizations. For more information, see Enable Sharing with Amazon Organizations in the Amazon RAM User Guide.
Related services
Capacity Reservation sharing integrates with Amazon Resource Access Manager (Amazon RAM). Amazon RAM is a service that enables you to share your Amazon resources with any Amazon account or through Amazon Organizations. With Amazon RAM, you share resources that you own by creating a resource share. A resource share specifies the resources to share, and the consumers with whom to share them. Consumers can be individual Amazon accounts, or organizational units or an entire organization from Amazon Organizations.
For more information about Amazon RAM, see the Amazon RAM User Guide.
Share across Availability Zones
To ensure that resources are distributed across the Availability Zones for a Region, we independently
map Availability Zones to names for each account. This could lead to Availability Zone naming differences
across accounts. For example, the Availability Zone us-east-1a for your Amazon account might
not have the same location as us-east-1a for another Amazon account.
To identify the location of your Capacity Reservations relative to your accounts, you must use the
Availability Zone ID (AZ ID). The AZ ID is a unique and
consistent identifier for an Availability Zone across all Amazon accounts. For
example, use1-az1 is an AZ ID for the us-east-1 Region and
it is the same location in every Amazon account.
To view the AZ IDs for the Availability Zones in your account
Open the Amazon RAM console at https://console.amazonaws.cn/ram
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The AZ IDs for the current Region are displayed in the Your AZ ID panel on the right-hand side of the screen.
Shared Capacity Reservation permissions
Permissions for owners
Owners are responsible for managing and canceling their shared Capacity Reservations. Owners cannot modify instances running in the shared Capacity Reservation that are owned by other accounts. Owners remain responsible for managing instances that they launch into the shared Capacity Reservation.
Permissions for consumers
Consumers are responsible for managing their instances that are running the shared Capacity Reservation. Consumers cannot modify the shared Capacity Reservation in any way, and they cannot view or modify instances that are owned by other consumers or the Capacity Reservation owner.
Billing and metering
There are no additional charges for sharing Capacity Reservations.
The Capacity Reservation owner is billed for instances that they run inside the Capacity Reservation and for unused reserved capacity. Consumers are billed for the instances that they run inside the shared Capacity Reservation.
If the Capacity Reservation owner belongs to a different payer account and the Capacity Reservation is covered by a Regional Reserved Instance or a Savings Plan, the Capacity Reservation owner continues to be billed for the Regional Reserved Instance or Savings Plan. In these cases, the Capacity Reservation owner pays for the Regional Reserved Instance or Savings Plan, and consumers are billed for the instances that the run in the shared Capacity Reservation.
Instance limits
All Capacity Reservation usage counts toward the Capacity Reservation owner's On-Demand Instance limits. This includes:
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Unused reserved capacity
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Usage by instances owned by the Capacity Reservation owner
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Usage by instances owned by consumers
Instances launched into the shared capacity by consumers count towards the Capacity Reservation owner's On-Demand Instance limit. Consumers' instance limits are a sum of their own On-Demand Instance limits and the capacity available in the shared Capacity Reservations to which they have access.