Amazon Elastic Compute Cloud
User Guide for Linux (API Version 2014-10-01)
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Amazon EC2 Spot Instance Limits

There are two kinds of Spot Instance limits: bid price limits and request limits.

  • A Spot bid price limit is the maximum price you can bid when you make a request for Spot Instances.

  • A Spot Instance request limit is the number of instances per region that you can request.

For information about other AWS service limits, see AWS Service Limits.

Spot Bid Price Limits

On December 20, 2013, Amazon EC2 introduced a default limit on the maximum amount that you can bid for a Spot Instance. The default bid price limit is designed to protect Spot Instance customers from incurring unexpected charges due to high bid prices.

The default bid price limit is set to four times the On-Demand price. For example, if you submit a Spot Instance request for a Linux m3.2xlarge instance in the us-east-1 region, for which the On-Demand price is $0.900 per hour, you can bid up to $3.600 per hour.

If your application requires you to bid above the default bid price limit, you can submit a limit increase request to spot-limit-increase@amazon.com. Your limit increase request must include the following information:

  • Your AWS account number.

  • A description of how you use Spot Instances and manage Spot interruptions.

  • The bid price limit you are requesting (specifying the instance type, region, and product platform).

For information about On-Demand instance pricing, see Amazon EC2 Pricing.

Spot Request Limits

The number of Spot Instance requests that an account can make per region varies depending on factors such as the region, the instance type, and the account's status. The default regional Spot request limit is generally 20 Spot Instances per account. However, your limit might be as low as 1 instance per region if you are a new AWS customer or if you are requesting certain EC2 instance types. In addition, the instance types T2, I2, and HS1 are not available on Spot, and some instance types, such as g2.2xlarge, are not available in all regions.

If you submit a Spot Instance request, and you receive an error stating Max spot instance count exceeded, your account is either at its overall Spot request limit for the region, or you are requesting a specific regional limit for an instance type. Try submitting another request with fewer instances.

The following table lists the different limits for certain instance types per region. Generally, accounts have a regional Spot request limit of 20.

Instance TypeSpot Limit

cg1.4xlarge

10

g2.2xlarge

10

c3.4xlarge, c3.8xlarge

20

cc1.4xlarge

20

cc2.8xlarge

20

m2.2xlarge, m2.4xlarge

20

hi1.4xlarge

10

r3.large, r3.xlarge, r3.2xlarge

10

r3.4xlarge, r3.8xlarge

5

For the Spot service to consider your Spot Instance request, you should not request a number of instances that exceeds your account's overall regional Spot request limit, or the instance type-specific Spot request limit.

For example, say you submit a Spot Instance request for 20 m1.small instances. Accounts generally are allowed 20 such instances per region. However, if your account is only allowed 10 m1.small instances per region, your request will not be considered. Alternatively, let's say that your account is allowed 100 instances per region and you submitted a Spot Instance request for 10 r3.4xlarge instances. The limit on this instance type is 5 per region. Your request will not be processed because you're requesting more r3.4xlarge instances than is allowed.

If you want to make additional Spot requests in a region, you can complete the Amazon EC2 instance request form. Specify in the Use Case Description that you are requesting an increase to your account's Spot Instance request limit. Limit increases apply to the region specified in the request form.

Note

Keep in mind that even if you are within your Spot request limits, your Spot Instances can be terminated if your bid price no longer exceeds the Spot price, or if there is a Spot capacity shortage.