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Showing content from https://docs.aws.amazon.com/IAM/latest/APIReference/API_AddRoleToInstanceProfile.html below:

AWS Identity and Access Management

AddRoleToInstanceProfile

Adds the specified IAM role to the specified instance profile. An instance profile can contain only one role, and this quota cannot be increased. You can remove the existing role and then add a different role to an instance profile. You must then wait for the change to appear across all of AWS because of eventual consistency. To force the change, you must disassociate the instance profile and then associate the instance profile, or you can stop your instance and then restart it.

Note

The caller of this operation must be granted the PassRole permission on the IAM role by a permissions policy.

Important

When using the iam:AssociatedResourceArn condition in a policy to restrict the PassRole IAM action, special considerations apply if the policy is intended to define access for the AddRoleToInstanceProfile action. In this case, you cannot specify a Region or instance ID in the EC2 instance ARN. The ARN value must be arn:aws:ec2:*:CallerAccountId:instance/*. Using any other ARN value may lead to unexpected evaluation results.

For more information about roles, see IAM roles in the IAM User Guide. For more information about instance profiles, see Using instance profiles in the IAM User Guide.

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

InstanceProfileName

The name of the instance profile to update.

This parameter allows (through its regex pattern) a string of characters consisting of upper and lowercase alphanumeric characters with no spaces. You can also include any of the following characters: _+=,.@-

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: [\w+=,.@-]+

Required: Yes

RoleName

The name of the role to add.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 64.

Pattern: [\w+=,.@-]+

Required: Yes

Errors

For information about the errors that are common to all actions, see Common Errors.

EntityAlreadyExists

The request was rejected because it attempted to create a resource that already exists.

HTTP Status Code: 409

LimitExceeded

The request was rejected because it attempted to create resources beyond the current AWS account limits. The error message describes the limit exceeded.

HTTP Status Code: 409

NoSuchEntity

The request was rejected because it referenced a resource entity that does not exist. The error message describes the resource.

HTTP Status Code: 404

ServiceFailure

The request processing has failed because of an unknown error, exception or failure.

HTTP Status Code: 500

UnmodifiableEntity

The request was rejected because service-linked roles are protected AWS resources. Only the service that depends on the service-linked role can modify or delete the role on your behalf. The error message includes the name of the service that depends on this service-linked role. You must request the change through that service.

HTTP Status Code: 400

Examples Example

This example illustrates one usage of AddRoleToInstanceProfile.

Sample Request

https://iam.amazonaws.com/?Action=AddRoleToInstanceProfile
&InstanceProfileName=Webserver
&RoleName=S3Access
&Version=2010-05-08
&AUTHPARAMS

Sample Response

<AddRoleToInstanceProfileResponse xmlns="https://iam.amazonaws.com/doc/2010-05-08/">
  <ResponseMetadata>
    <RequestId>12657608-99f2-11e1-a4c3-27EXAMPLE804</RequestId>
  </ResponseMetadata>
</AddRoleToInstanceProfileResponse>