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:
Creating an interface VPC endpoint for Amazon S3 ensures private connectivity between the EC2 instance and the S3 bucket without routing through the public internet. Attaching a resource policy to the S3 bucket to allow only the EC2 instance’s IAM role ensures secure access.
A gateway VPC endpoint for Amazon S3 is used for communication with S3 over private routes, but security groups are not applicable to VPC endpoints for S3. Only IAM policies and S3 bucket policies control access, not security groups.
This approach relies on manual configuration of IP addresses using nslookup and route tables, which is error-prone and not a recommended practice. It also bypasses the use of VPC endpoints for private communication.
Similar to option C, this approach uses an outdated method by referencing the ip-ranges.json file to create manual routes. This is not recommended and does not ensure secure, private communication via VPC endpoints.
From my point of view, the answer is:
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.