How can this task be automated?
Use Amazon Athena to query AWS CloudTrail logs to check for any associate-address attempts. Create an AWS Lambda function to disassociate the Elastic IP address from the instance, and alert the security team.
Attach an IAM policy to the developers’ IAM group to deny associate-address permissions. Create a custom AWS Config rule to check whether an Elastic IP address is associated with any instance tagged as production, and alert the security team.
Ensure that all IAM groups associated with developers do not have associate-address permissions. Create a scheduled AWS Lambda function to check whether an Elastic IP address is associated with any instance tagged as production, and alert the security team if an instance has an Elastic IP address associated with it.
Create an AWS Config rule to check that all production instances have EC2 IAM roles that include deny associate-address permissions. Verify whether there is an Elastic IP address associated with any instance, and alert the security team if an instance has an Elastic IP address associated with it.
Explanations:
While Athena can query CloudTrail logs, the task requires a proactive prevention mechanism (denying permissions). Lambda should not be used to disassociate an Elastic IP address automatically without addressing the permission aspect.
This option ensures that developers cannot associate Elastic IP addresses by denying the permissions in IAM and uses AWS Config to check if a production instance has an Elastic IP, notifying the security team.
Although it involves checking for Elastic IP associations, using Lambda to check periodically without preventing the initial attachment is reactive, not proactive. Denying permissions at the IAM level is more effective.
IAM roles for EC2 instances cannot be used to deny Elastic IP association; this must be handled by IAM policies at the user level. The rule would not prevent developers from attaching Elastic IPs to instances.