# CreateStackInstances Creates stack instances for the specified accounts, within the specified AWS Regions. A stack instance refers to a stack in a specific account and Region. You must specify at least one value for either `Accounts` or `DeploymentTargets`, and you must specify at least one value for `Regions`. **Note** The maximum number of organizational unit (OUs) supported by a `CreateStackInstances` operation is 50. If you need more than 50, consider the following options: *Batch processing:* If you don't want to expose your OU hierarchy, split up the operations into multiple calls with less than 50 OUs each. *Parent OU strategy:* If you don't mind exposing the OU hierarchy, target a parent OU that contains all desired child OUs. ## Request Parameters For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md). **Accounts.member.N** [Self-managed permissions] The account IDs of one or more AWS accounts that you want to create stack instances in the specified Region(s) for. You can specify `Accounts` or `DeploymentTargets`, but not both. Type: Array of strings Pattern: `^[0-9]{12}$` Required: No ** CallAs ** [Service-managed permissions] Specifies whether you are acting as an account administrator in the organization's management account or as a delegated administrator in a member account. By default, `SELF` is specified. Use `SELF` for StackSets with self-managed permissions. + If you are signed in to the management account, specify `SELF`. + If you are signed in to a delegated administrator account, specify `DELEGATED_ADMIN`. Your AWS account must be registered as a delegated administrator in the management account. For more information, see [Register a delegated administrator](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-orgs-delegated-admin.html) in the * AWS CloudFormation User Guide*. Type: String Valid Values: `SELF | DELEGATED_ADMIN` Required: No ** DeploymentTargets ** [Service-managed permissions] The AWS Organizations accounts in which to create stack instances in the specified AWS Regions. You can specify `Accounts` or `DeploymentTargets`, but not both. Type: [DeploymentTargets](API_DeploymentTargets.md) object Required: No ** OperationId ** The unique identifier for this StackSet operation. The operation ID also functions as an idempotency token, to ensure that CloudFormation performs the StackSet operation only once, even if you retry the request multiple times. You might retry StackSet operation requests to ensure that CloudFormation successfully received them. Repeating this StackSet operation with a new operation ID retries all stack instances whose status is `OUTDATED`. Type: String Length Constraints: Minimum length of 1. Maximum length of 128. Pattern: `[a-zA-Z0-9][-a-zA-Z0-9]*` Required: No ** OperationPreferences ** Preferences for how CloudFormation performs this StackSet operation. Type: [StackSetOperationPreferences](API_StackSetOperationPreferences.md) object Required: No **ParameterOverrides.member.N** A list of StackSet parameters whose values you want to override in the selected stack instances. Any overridden parameter values will be applied to all stack instances in the specified accounts and AWS Regions. When specifying parameters and their values, be aware of how CloudFormation sets parameter values during stack instance operations: + To override the current value for a parameter, include the parameter and specify its value. + To leave an overridden parameter set to its present value, include the parameter and specify `UsePreviousValue` as `true`. (You can't specify both a value and set `UsePreviousValue` to `true`.) + To set an overridden parameter back to the value specified in the StackSet, specify a parameter list but don't include the parameter in the list. + To leave all parameters set to their present values, don't specify this property at all. During StackSet updates, any parameter values overridden for a stack instance aren't updated, but retain their overridden value. You can only override the parameter *values* that are specified in the StackSet; to add or delete a parameter itself, use [UpdateStackSet](https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_UpdateStackSet.html) to update the StackSet template. Type: Array of [Parameter](API_Parameter.md) objects Required: No **Regions.member.N** The names of one or more AWS Regions where you want to create stack instances using the specified AWS accounts. Type: Array of strings Pattern: `^[a-zA-Z0-9-]{1,128}$` Required: Yes ** StackSetName ** The name or unique ID of the StackSet that you want to create stack instances from. Type: String Required: Yes ## Response Elements The following element is returned by the service. ** OperationId ** The unique identifier for this StackSet operation. Type: String Length Constraints: Minimum length of 1. Maximum length of 128. Pattern: `[a-zA-Z0-9][-a-zA-Z0-9]*` ## Errors For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md). ** InvalidOperation ** The specified operation isn't valid. HTTP Status Code: 400 ** LimitExceeded ** The quota for the resource has already been reached. For information about resource and stack limitations, see [CloudFormation quotas](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cloudformation-limits.html) in the * AWS CloudFormation User Guide*. HTTP Status Code: 400 ** OperationIdAlreadyExists ** The specified operation ID already exists. HTTP Status Code: 409 ** OperationInProgress ** Another operation is currently in progress for this StackSet. Only one operation can be performed for a stack set at a given time. HTTP Status Code: 409 ** StackSetNotFound ** The specified StackSet doesn't exist. HTTP Status Code: 404 ** StaleRequest ** Another operation has been performed on this StackSet since the specified operation was performed. HTTP Status Code: 409 ## Examples ### CreateStackInstances This example illustrates one usage of CreateStackInstances. #### Sample Request ``` https://cloudformation.us-east-1.amazonaws.com/ ?Action=CreateStackInstances &Version=2010-05-15 &StackSetName=stack-set-example &Regions.member.1=us-east-1 &Regions.member.2=us-west-2 &OperationPreferences.MaxConcurrentCount=5 &OperationPreferences.FailureTolerancePercentage=10 &Accounts.member.1=[account] &Accounts.member.2=[account] &OperationId=c424b651-2fda-4d6f-a4f1-20c0example &X-Amz-Algorithm=AWS4-HMAC-SHA256 &X-Amz-Credential=[Access key ID and scope] &X-Amz-Date=20170810T233349Z &X-Amz-SignedHeaders=content-type;host &X-Amz-Signature=[Signature] ``` #### Sample Response ``` c424b651-2fda-4d6f-a4f1-20c0fc62a6fe 97564c5e-813e-11e7-a9b2-5b163763e702 ``` ## See Also For more information about using this API in one of the language-specific AWS SDKs, see the following: + [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/cloudformation-2010-05-15/CreateStackInstances) + [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cloudformation-2010-05-15/CreateStackInstances)