Associate a Role to a running AWS instance

Question

In order to run AWS monitoring scripts (http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/mon-scripts-perl.html) on one of my ec2 existing instance, I need a IAM

Answer 1

AWS doesn't allow you to modify the instance role after launching the instance.

You can either:

1) Launch a new instance with the role needed by taking the AMI of the already running instance and reassigning the EIP.

or

2) Create a headless user, generate access key and secret key for the user with specific permssion, and use those keys.