Spot Instance Limits
Spot instance requests are subject to the following limits:
Unsupported Instance Types
The following instance types are not supported for Spot:
Some Spot instance types aren't available in every region. To view the supported instance types for a region, go to Spot Instance Pricing and select the region.
Spot Request Limits
You are limited to the number of Spot instance requests you can have. There is an overall limit and limits that apply to each instance type.
The overall limit applies to the active or open Spot instance requests. If you terminate your Spot instance but do not cancel the request, the request counts against your overall limit until Amazon EC2 detects the termination and closes your request.
The following table lists the overall request limit for Spot instance requests. Note that new AWS accounts might have lower limits.
The total number of Spot instance requests
20 per region
If you submit a Spot instance request and you receive the error
Max spot instance
count exceeded, your account has exceeded either its overall limit
for Spot instance requests for the region, or the limit for Spot instance
requests for a specific instance type for the region. To submit a limit
increase request, go to AWS Support
Center and complete the request form. In the Use Case
Description field, indicate that you are requesting an increase
to the limit for Spot instance requests.
Spot Bid Price Limit
The bid price limit is designed to protect you from incurring unexpected charges.
The following table lists the bid price limit for Spot instances.
Ten times the On-Demand price
Spot Fleet Limits
The usual Amazon EC2 limits apply to instances launched by a Spot fleet, such as Spot bid price limits, instance limits, and volume limits. In addition, the following limits apply:
The number of active Spot fleets per region: 1,000
The number of launch specifications per fleet: 50
The size of the user data in a launch specification: 16 KB
The number of instances per Spot fleet: 3,000
The number of instances in all Spot fleets in a region: 3,000
A Spot fleet request can't span regions.
A Spot fleet request can't span different subnets from the same Availability Zone.
Amazon EBS Encryption Unsupported
You can specify encrypted EBS volumes in the launch specification for your Spot instances, but these volumes are not encrypted.