Elastic Compute Service:Use a private pool to create ECS instances

Use the ECS console

This section describes only the private pool-related parameters involved in the procedure for creating ECS instances. For information about other parameters involved in the procedure for creating ECS instances, see Create an instance on the Custom Launch tab.

1. Before you can use a private pool to create ECS instances in the ECS console, use one of the following methods to go to the ECS instance buy page:

   • On the Instance page, click Create Instance.

     

   • On the Resource Reservations page, find a resource reservation that is in the Active state and click Purchase Instance in the Actions column.

     

2. Configure the basic settings.

   The following table describes the parameters related to the basic settings.

   Parameter	Description
   Billing Method	To use the private pool that is associated with an elasticity assurance, an immediate capacity reservation, or a capacity reservation with Savings Plan, set this parameter to Pay-as-you-go. To use the private pool that is associated with a capacity reservation for subscription resources, set this parameter to Subscription.
   Region	Select the same region as the resource reservation.
   Network and Zone	Select the same network and zone as the resource reservation.
   Instance	Select the same instance type as the resource reservation.
   Image	To use the private pool that is associated with an immediate capacity reservation, select an image that uses the Linux or Windows operating system that is the same operating system used by the immediate capacity reservation.

3. Configure the parameters in the Storage, Bandwidths & Security Groups, and Management sections. Then, click Advanced Settings(Optional).

4. In the Advanced Settings(Optional) section, configure the parameters based on your business requirements. In the Private Pool Type field, specify whether to use a private pool and how to use the private pool.

   • Specify the ID of a private pool: When you create instances, select Targeted from the Private Pool Type drop-down list and specify the ID of the private pool that you want to use. The ID of a private pool is the same as the ID of the associated resource reservation. If the specified private pool has no available capacity, instances cannot be created.

     Note

     You can specify the ID of an open private pool or a targeted private pool to use the private pool.

   • Use an open private pool that is assigned by the system. If you select Open from the Private Pool Type drop-down list, the system automatically selects an open private pool. If the open private pool does not have available capacity, the system attempts to use the capacity of a public pool.

     Note

     The system selects only open private pools.

   • Specify not to use the private pool capacity. When you create instances, select None from the Private Pool Type drop-down list. The public pool is used.

5. Check your configurations and read and agree to the terms of service. Confirm to create the instance and complete the payment.

Call an API operation

When you call the RunInstances operation to create an ECS instance, configure the PrivatePoolOptions.MatchCriteria parameter to specify the private pool type of the instance.

• Open: open private pool. The system selects a matching open private pool to start the instance. If no matching open private pools are found, resources in the public pool are used. If you set the PrivatePoolOptions.MatchCriteria parameter to Open, you can leave the PrivatePoolOptions.Id parameter empty.

• Target: targeted private pool. The system uses the capacity in a specified private pool to start the instance. If the specified private pool is unavailable, the instance cannot be started. If you set the PrivatePoolOptions.MatchCriteria parameter to Target, you must specify the PrivatePoolOptions.Id parameter.

• None: no private pool. The capacity in private pools is not used.