A company needs to move data from an Amazon EC2 instance to an Amazon S3 bucket. The company must ensure that no API calls and no data are routed through public internet routes. Only the EC2 instance can have access to upload data to the S3 bucket.
Which solution will meet these requirements?
Creating an interface VPC endpoint for Amazon S3 in the subnet where the EC2 instance is located ensures that the data transfer remains within the AWS network, avoiding the public internet. By attaching a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access, this restricts access solely to the EC2 instance. This solution guarantees the required private connectivity and secure access control.
I think answer should be A and not B. as we cannot "Attach a security groups to a gateway endpoint."
It's possible: https://aws.amazon.com/premiumsupport/knowledge-center/connect-s3-vpc-endpoint/
No, it’s not
Create a security group that allows the resources in your VPC to communicate with the endpoint network interfaces for the VPC endpoint. To ensure that tools such as the AWS CLI can make requests over HTTPS from resources in the VPC to the AWS service, the security group must allow inbound HTTPS traffic. For Security groups, select the security groups to associate with the endpoint network interfaces for the VPC endpoint. By default, we associate the default security group for the VPC.
this is valid for interface endpoint, not for gateway endpoint, which option B mentioned
Gateway endpoint must be used as a target in a route table does not use security groups.
Go to console and test it yourself! With Interface Endpoint you can add security groups.
The correct solution to meet the requirements is Option B. A gateway VPC endpoint for Amazon S3 should be created in the Availability Zone where the EC2 instance is located. This will allow the EC2 instance to access the S3 bucket directly, without routing through the public internet. The endpoint should also be configured with appropriate security groups to allow access to the S3 bucket. Additionally, a resource policy should be attached to the S3 bucket to only allow the EC2 instance's IAM role for access.
Option A is incorrect because an interface VPC endpoint for Amazon S3 would not provide a direct connection between the EC2 instance and the S3 bucket. Option C is incorrect because using the nslookup tool to obtain the private IP address of the S3 bucket's service API endpoint would not provide a secure connection between the EC2 instance and the S3 bucket. Option D is incorrect because using the ip-ranges.json file to obtain the private IP address of the S3 bucket's service API endpoint is not a secure method to connect the EC2 instance to the S3 bucket.
An interface VPC endpoint does provide a direct connection between the EC2 instance and the S3 bucket. It enables private communication between instances in your VPC and resources in other services without requiring an internet gateway, a NAT device, or a VPN connection. Option A , which recommends creating an interface VPC endpoint for Amazon S3 in the subnet where the EC2 instance is located and attaching a resource policy to the S3 bucket to only allow the EC2 instance's IAM role for access, is the correct solution for the given scenario. It meets the requirement to ensure that no API calls and no data are routed through public internet routes and that only the EC2 instance can have access to upload data to the S3 bucket.
In support, see https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html#types-of-vpc-endpoints-for-s3
There are two types VPC Endpoint: Gateway endpoint Interface endpoint A Gateway endpoint: 1) Helps you to securely connect to Amazon S3 and DynamoDB 2) Endpoint serves as a target in your route table for traffic 3) Provide access to endpoint (endpoint, identity and resource policies) An Interface endpoint: 1) Help you to securely connect to AWS services EXCEPT FOR Amazon S3 and DynamoDB 2) Powered by PrivateLink (keeps network traffic within AWS network) 3) Needs a elastic network interface (ENI) (entry point for traffic)
interface endpoint exists for S3 as well
You associate a gateway endpoint with a VPC and its subnets (so the prefix list can be added to the appropriate routing tables). You cannot specify an AZ or associate an SG when creating a gateway endpoint.
Option B is confusing but not after you see the fine-print. - User cannot create Gateway endpoint in any specific Availability Zone, User only specify under which VPC it needs to be created. - User do not select/attach security group to Gateway Endpoint, as this gateway only works be adding destination prefix list(S3) to gateway endpoint route. Correct Answer: A
B. Interface endpoints are for private link and require ip address. gateway endpoints are for internal services and don't need ip address. https://docs.aws.amazon.com/whitepapers/latest/aws-privatelink/what-are-vpc-endpoints.html
we cannot "Attach a security groups to a gateway endpoint."
It must be Interface VPC endpoint. As the Gateway VPC endpoint requires a S3 pubilc IP address to work: https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html If the bucket has a public IP address, it means the bucket is publicy accessible, which is not the case here.
DynamoDB & S3 uses Gateway VPC endpoint (not interface)
I used to think that gatway endpoints were only for s3 and dynamodb, but I guess thats not the whole story. S3 can use interface endpoints, and they are privately routed. https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html#types-of-vpc-endpoints-for-s3
vpc gateway endpoint
Answer B What is VPC gateway endpoint Consider a scenario where you have to access S3 from your EC2 instance in a public subnet. As the subnet has an internet gateway attached, the traffic to S3 will go through the public internet. However, the problem arises if your instance is in a private subnet and does not have any NAT gateway/instance attached or you cannot afford charges of NAT gateway. Currently, AWS S3 and DynamoDB are the only services supported by gateway endpoints. Using Gateway endpoints does not incur any data processing or hourly charges.
Explanation: Option A: Interface VPC endpoint for Amazon S3 ensures that the data transfer between the EC2 instance and the S3 bucket stays within the AWS network, avoiding the public internet. By attaching a resource policy to the S3 bucket to only allow access from the EC2 instance's IAM role, you ensure that only the EC2 instance can upload data to the S3 bucket. Option B: Gateway VPC endpoint for Amazon S3 doesn't ensure that the data transfer stays within the AWS network; it can still use the public internet. Although you can attach security groups to the endpoint, it doesn't guarantee that the data transfer won't use public internet routes.
Option A as security group is not applicable for Gateway end point.
im almost certain that the answers in this question are written slightly wrong. there is no reason (based on the question), for you to select A. Only EC2 needs access to S3, 99% of the time you'd use a gateway endpoint. Reasons you might use an interface endpoint are: - requirement of on-premise access to S3 - requirement of access from another VPC in another region using peering or transit gateway - requirement of using specific endpoint S3 DNS names - use of private IPs from your VPC to access S3 based on the above, i believe the answer to be B, its just written incorrectly with the addition of the security groups part.
A for sure
The wording in B says create a gateway VPC endpoint in the AZ, surely it should say in the VPC...... L
Gateway endpoint would be sufficient here which is specifically for S3 and dynamo DB and don't incurr any charges. Interface VPC endpoint might be usefull if a scneario with cross region or on-premises connectivity within private VPC https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html