title: AWS - Conditionally run a script on EC2 instances
body: <p>I am looking for a way to conditionally run a script on every existing / new EC2 instances.</p>
  <p>For example, in Azure, you can create an Azure Policy that is executed on every existing / new VM, and when a set of conditions apply on that VM, you can deploy a VM extension or run a DSC script.
  I am looking for the equivalent service in AWS.</p>