How to run StarCluster with AWS IAM Role

[ewijaya]

How can I modify StarCluster config or code to include IAM Role?

So that when I do this:

starcluster start mycluster

The IAM Role can be automatically activated in EC2 instances (master and nodes).
I did try to look around but of no avail info.
At the end of the day, I need to mount my S3-bucket, which is assigned to IAM Role.

[cancan101]

see: #575 and JohnCEarls@e70ad7a#diff-511f45764524effffd5cc4e4ef100afa