# InstanceRequirements
<a name="API_InstanceRequirements"></a>

Specifications that define the characteristics and constraints for compute instances used by the capacity provider.

## Contents
<a name="API_InstanceRequirements_Contents"></a>

 ** AllowedInstanceTypes **   <a name="lambda-Type-InstanceRequirements-AllowedInstanceTypes"></a>
A list of EC2 instance types that the capacity provider is allowed to use. If not specified, all compatible instance types are allowed.  
Type: Array of strings  
Array Members: Minimum number of 0 items. Maximum number of 400 items.  
Length Constraints: Minimum length of 1. Maximum length of 30.  
Pattern: `[a-zA-Z0-9\.\-]+`   
Required: No

 ** Architectures **   <a name="lambda-Type-InstanceRequirements-Architectures"></a>
A list of supported CPU architectures for compute instances. Valid values include `x86_64` and `arm64`.  
Type: Array of strings  
Array Members: Fixed number of 1 item.  
Valid Values: `x86_64 | arm64`   
Required: No

 ** ExcludedInstanceTypes **   <a name="lambda-Type-InstanceRequirements-ExcludedInstanceTypes"></a>
A list of EC2 instance types that the capacity provider should not use, even if they meet other requirements.  
Type: Array of strings  
Array Members: Minimum number of 0 items. Maximum number of 400 items.  
Length Constraints: Minimum length of 1. Maximum length of 30.  
Pattern: `[a-zA-Z0-9\.\-]+`   
Required: No

## See Also
<a name="API_InstanceRequirements_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/lambda-2015-03-31/InstanceRequirements) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/lambda-2015-03-31/InstanceRequirements) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/lambda-2015-03-31/InstanceRequirements)