Which of the following should successfully install the application while complying with the new rule?
Launch the instances in a public subnet with Elastic IP addresses attached. Once the application is installed and running, run a script to disassociate the Elastic IP addresses afterwards.
Set up a NAT gateway. Deploy the EC2 instances to a private subnet. Update the private subnet’s route table to use the NAT gateway as the default route.
Publish the application artifacts to an Amazon S3 bucket and create a VPC endpoint for S3. Assign an IAM instance profile to the EC2 instances so they can read the application artifacts from the S3 bucket.
Create a security group for the application instances and allow only outbound traffic to the artifact repository. Remove the security group rule once the install is complete.
Explanations:
While this option would allow the instances to install the application using internet access, it violates the requirement for no internet access as Elastic IP addresses provide public internet connectivity. Disassociating them after installation does not comply with the new security classification rule.
Setting up a NAT gateway allows instances in a private subnet to access the internet for updates or downloads, but this contradicts the requirement for no internet access. The instances would still have internet connectivity through the NAT gateway.
By publishing the application artifacts to an S3 bucket and creating a VPC endpoint for S3, the EC2 instances can access the S3 bucket without needing an internet connection. This solution complies with the new security classification and allows the application to be installed.
Allowing outbound traffic to the artifact repository would still mean the instances have some form of internet access, which goes against the requirement. Additionally, removing the rule afterward does not change the fact that the initial installation would require internet access.
I sort that the answer is:
Publish the application artifacts to an Amazon S3 bucket and create a VPC endpoint for S3. Assign an IAM instance profile to the EC2 instances so they can read the application artifacts from the S3 bucket.