Launching an EC2 Instance with an IAM Role Using Ansible

http://docs.ansible.com/ec2_module.html

instance_profile_name (added in 1.3):
Name of the IAM instance profile to use. Boto library must be 2.5.0+

- name: Get Instance ID
  debug: var=ec2_id

- name: set IAM ROLE
  ec2_instance:
    region: eu-west-3
    aws_access_key: "{{ package_aws_access_key }}"
    aws_secret_key: "{{ package_aws_secret_key }}"  
    instance_ids:
        - "{{ ec2_id }}"
    instance_role: "{{ iam_role }}"
  delegate_to: localhost