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If you want to make sure AWS resources are only created in specific regions, the best way to do this is by using Service Control Policies (SCPs) if your accounts are part of AWS Organizations. SCPs allow you to set rules about which regions are allowed for creating resources across all your accounts.
You can set up a deny rule that blocks all actions unless the request is made from an approved region. This way, resources can’t be created in unauthorized regions before they even start provisioning. It’s a proactive approach that helps keep everything compliant from the start.
If you haven’t set up SCPs yet or want to catch any missteps during a transition, you can use AWS CloudTrail along with CloudWatch Logs Insights or EventBridge to monitor activity. CloudTrail tracks all API actions related to creating resources, including details like which region was used and who made the request. You can check these logs regularly to spot any resource creation that happens outside your approved regions.
EventBridge is another useful tool. You can set it up to send notifications whenever API calls happen outside approved regions. This helps you identify and respond to any unauthorized activity almost in real time.
For environments that need automatic fixes, you can take it a step further. When you detect an unauthorized resource creation, EventBridge can trigger a Lambda function that will quickly undo the change — for example, by terminating an EC2 instance or deleting a newly created resource. This quick response prevents non-compliant resources from sticking around and keeps everything under control.
Overall, using SCPs to prevent unwanted resource creation, combined with CloudTrail monitoring and real-time alerts, gives you strong governance and helps you stay compliant. This integrated approach keeps your AWS environment secure and well-managed.
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