Amazon EC2 – How to Add a Security Group to a Running Instance

amazon ec2cloud computinglinuxSecurity

I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?

Best Answer

Update 2015-02-27:

This is now possible, see the answer below.

Old reply:

Amazon's FAQ says it's not possible to define a security group anywhere but at launch time.