Which solution will meet these requirements?
Create an interface VPC endpoint for Amazon S3 in the subnet where the EC2 instance is located. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
Create a gateway VPC endpoint for Amazon S3 in the Availability Zone where the EC2 instance is located. Attach appropriate security groups to the endpoint. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
Run the nslookup tool from inside the EC2 instance to obtain the private IP address of the S3 bucket’s service API endpoint. Create a route in the VPC route table to provide the EC2 instance with access to the S3 bucket. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
Use the AWS provided, publicly available ip-ranges.json file to obtain the private IP address of the S3 bucket’s service API endpoint. Create a route in the VPC route table to provide the EC2 instance with access to the S3 bucket. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
Explanations:
An interface VPC endpoint is not required for S3, as S3 supports only gateway VPC endpoints. Moreover, resource policies alone do not restrict access to the S3 bucket from public internet routes.
A gateway VPC endpoint for S3 allows the EC2 instance to access S3 without routing through the internet. The endpoint allows private communication, and a resource policy can restrict access to the specific IAM role of the EC2 instance, ensuring security.
Using nslookup to obtain a private IP address for the S3 endpoint is not valid as S3 does not have a static private IP. Additionally, modifying the VPC route table in this manner does not guarantee that data won’t route through the public internet.
Using the public ip-ranges.json file to find a private IP address for S3 is not applicable since S3 endpoints are accessed through gateway endpoints. Routes cannot be established in this manner for a service that inherently requires gateway VPC endpoints.
To the best of my knowledge, the answer is:
Create a gateway VPC endpoint for Amazon S3 in the Availability Zone where the EC2 instance is located. Attach appropriate security groups to the endpoint. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.