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
By default, there is an account limit of 20 Spot instances per region. If you terminate your Spot instance but do not cancel the request, the request counts against this limit until Amazon EC2 detects the termination and closes the request.
Spot instance limits are dynamic. When your account is new, your limit might be lower
than 20 to start, but increase over time. In addition, your account might have limits
on specific Spot instance types. If you submit a Spot instance request and you receive
Max spot instance count exceeded, you can go to
AWS Support Center
and submit a limit increase request form. For Use Case Description,
indicate that you need an increase in your limits for Spot instance requests.
Spot Bid Price Limit
The bid price limit for Spot instances is ten times the On-Demand price. This limit is designed to help you control costs.
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 target capacity per Spot fleet: 3,000
The target capacity across all Spot fleets in a region: 5,000
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.