# CreateRoleAlias


Creates a role alias.

Requires permission to access the [CreateRoleAlias](https://docs.amazonaws.cn/service-authorization/latest/reference/list_awsiot.html#awsiot-actions-as-permissions) action.

**Important**  
The value of [https://docs.amazonaws.cn/iot/latest/apireference/API_CreateRoleAlias.html#iot-CreateRoleAlias-request-credentialDurationSeconds](https://docs.amazonaws.cn/iot/latest/apireference/API_CreateRoleAlias.html#iot-CreateRoleAlias-request-credentialDurationSeconds) must be less than or equal to the maximum session duration of the IAM role that the role alias references. For more information, see [ Modifying a role maximum session duration (Amazon API)](https://docs.amazonaws.cn/IAM/latest/UserGuide/roles-managingrole-editing-api.html#roles-modify_max-session-duration-api) from the Amazon Identity and Access Management User Guide.

## Request Syntax


```
POST /role-aliases/roleAlias HTTP/1.1
Content-type: application/json

{
   "credentialDurationSeconds": number,
   "roleArn": "string",
   "tags": [ 
      { 
         "Key": "string",
         "Value": "string"
      }
   ]
}
```

## URI Request Parameters


The request uses the following URI parameters.

 ** [roleAlias](#API_CreateRoleAlias_RequestSyntax) **   <a name="iot-CreateRoleAlias-request-uri-roleAlias"></a>
The role alias that points to a role ARN. This allows you to change the role without having to update the device.  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[\w=,@-]+`   
Required: Yes

## Request Body


The request accepts the following data in JSON format.

 ** [credentialDurationSeconds](#API_CreateRoleAlias_RequestSyntax) **   <a name="iot-CreateRoleAlias-request-credentialDurationSeconds"></a>
How long (in seconds) the credentials will be valid. The default value is 3,600 seconds.  
This value must be less than or equal to the maximum session duration of the IAM role that the role alias references.  
Type: Integer  
Valid Range: Minimum value of 900. Maximum value of 43200.  
Required: No

 ** [roleArn](#API_CreateRoleAlias_RequestSyntax) **   <a name="iot-CreateRoleAlias-request-roleArn"></a>
The role ARN.  
Type: String  
Length Constraints: Minimum length of 20. Maximum length of 2048.  
Required: Yes

 ** [tags](#API_CreateRoleAlias_RequestSyntax) **   <a name="iot-CreateRoleAlias-request-tags"></a>
Metadata which can be used to manage the role alias.  
For URI Request parameters use format: ...key1=value1&key2=value2...  
For the CLI command-line parameter use format: &&tags "key1=value1&key2=value2..."  
For the cli-input-json file use format: "tags": "key1=value1&key2=value2..."
Type: Array of [Tag](API_Tag.md) objects  
Required: No

## Response Syntax


```
HTTP/1.1 200
Content-type: application/json

{
   "roleAlias": "string",
   "roleAliasArn": "string"
}
```

## Response Elements


If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [roleAlias](#API_CreateRoleAlias_ResponseSyntax) **   <a name="iot-CreateRoleAlias-response-roleAlias"></a>
The role alias.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[\w=,@-]+` 

 ** [roleAliasArn](#API_CreateRoleAlias_ResponseSyntax) **   <a name="iot-CreateRoleAlias-response-roleAliasArn"></a>
The role alias ARN.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 2048.

## Errors


 ** InternalFailureException **   
An unexpected error has occurred.    
 ** message **   
The message for the exception.
HTTP Status Code: 500

 ** InvalidRequestException **   
The request is not valid.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

 ** LimitExceededException **   
A limit has been exceeded.    
 ** message **   
The message for the exception.
HTTP Status Code: 410

 ** ResourceAlreadyExistsException **   
The resource already exists.    
 ** message **   
The message for the exception.  
 ** resourceArn **   
The ARN of the resource that caused the exception.  
 ** resourceId **   
The ID of the resource that caused the exception.
HTTP Status Code: 409

 ** ServiceUnavailableException **   
The service is temporarily unavailable.    
 ** message **   
The message for the exception.
HTTP Status Code: 503

 ** ThrottlingException **   
The rate exceeds the limit.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

 ** UnauthorizedException **   
You are not authorized to perform this operation.    
 ** message **   
The message for the exception.
HTTP Status Code: 401

## See Also


For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon Command Line Interface V2](https://docs.amazonaws.cn/goto/cli2/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for .NET V4](https://docs.amazonaws.cn/goto/DotNetSDKV4/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for Go v2](https://docs.amazonaws.cn/goto/SdkForGoV2/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for JavaScript V3](https://docs.amazonaws.cn/goto/SdkForJavaScriptV3/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for Kotlin](https://docs.amazonaws.cn/goto/SdkForKotlin/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for PHP V3](https://docs.amazonaws.cn/goto/SdkForPHPV3/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for Python](https://docs.amazonaws.cn/goto/boto3/iot-2015-05-28/CreateRoleAlias) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/iot-2015-05-28/CreateRoleAlias)