Instance purchasing options

Amazon EC2 provides the following purchasing options to enable you to optimize your costs based on your needs:

• On-Demand Instances – Pay, by the second, for the instances that you launch.

• Savings Plans – Reduce your Amazon EC2 costs by making a commitment to a consistent amount of usage, in USD per hour, for a term of 1 or 3 years.

• Reserved Instances – Reduce your Amazon EC2 costs by making a commitment to a consistent instance configuration, including instance type and Region, for a term of 1 or 3 years.

• Spot Instances – Request unused EC2 instances, which can reduce your Amazon EC2 costs significantly.

• Dedicated Hosts – Pay for a physical host that is fully dedicated to running your instances, and bring your existing per-socket, per-core, or per-VM software licenses to reduce costs.

• Dedicated Instances – Pay, by the hour, for instances that run on single-tenant hardware.

If you require a capacity reservation, purchase Reserved Instances or Capacity Reservations for a specific Availability Zone. Capacity Blocks can be used to reserve a cluster of GPU instances. Spot Instances are a cost-effective choice if you can be flexible about when your applications run and if they can be interrupted. Dedicated Hosts or Dedicated Instances can help you address compliance requirements and reduce costs by using your existing server-bound software licenses. For more information, see Amazon EC2 Pricing.

For more information about Savings Plans, see the Savings Plans User Guide.

Contents

• Determine the instance lifecycle
• On-Demand Instances
• Reserved Instances
• Spot Instances
• Dedicated Hosts
• Dedicated Instances
• Capacity Reservations

Determine the instance lifecycle

The lifecycle of an instance starts when it is launched and ends when it is terminated. The purchasing option that you choose affects the lifecycle of the instance. For example, an On-Demand Instance runs when you launch it and ends when you terminate it. A Spot Instance runs as long as capacity is available and your maximum price is higher than the Spot price.

Use one of the following methods to determine the lifecycle of an instance.

To determine the instance lifecycle using the console

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.

2. In the navigation pane, choose Instances.

3. Select the instance.

4. On the Details tab, under Instance details, find Lifecycle. If the value is spot, the instance is a Spot Instance. If the value is normal, the instance is either an On-Demand Instance or a Reserved Instance.

5. On the Details tab, under Host and placement group, find Tenancy. If the value is host, the instance is running on a Dedicated Host. If the value is dedicated, the instance is a Dedicated Instance.

6. (Optional) If you have purchased a Reserved Instance and want to verify that it is being applied, you can check the usage reports for Amazon EC2. For more information, see Amazon EC2 usage reports.

To determine the instance lifecycle using the AWS CLI

Use the following describe-instances command:

aws ec2 describe-instances --instance-ids i-1234567890abcdef0

If the instance is running on a Dedicated Host, the output contains the following information:

"Tenancy": "host"

If the instance is a Dedicated Instance, the output contains the following information:

"Tenancy": "dedicated"

If the instance is a Spot Instance, the output contains the following information:

"InstanceLifecycle": "spot"

Otherwise, the output does not contain InstanceLifecycle.