[Home](./index.md) > [ibm-cloud-sdk-core](./ibm-cloud-sdk-core.md) > [VpcInstanceAuthenticator](./ibm-cloud-sdk-core.vpcinstanceauthenticator.md) > [(constructor)](./ibm-cloud-sdk-core.vpcinstanceauthenticator._constructor_.md) ## VpcInstanceAuthenticator.(constructor) Create a new VpcInstanceAuthenticator instance. **Signature:** ```typescript constructor(options: Options); ``` ## Parameters

Parameter	Type	Description
options	Options	Configuration options for VpcInstance authentication. This should be an object containing these fields: - url: (optional) the endpoint URL for the VPC Instance Metadata Service (default value: "http://169.254.169.254") - iamProfileCrn: (optional) the CRN of the linked IAM trusted profile to be used to obtain the IAM access token - iamProfileId: (optional) the ID of the linked IAM trusted profile to be used to obtain the IAM access token

## Remarks At most one of "iamProfileCrn" or "iamProfileId" may be specified. If neither one is specified, then the default IAM profile defined for the compute resource will be used.