Ansible playbook to control AWS Auto-scale group members dynmically.

apply_role_asg.yml

---
 - hosts: localhost
   connection: local
   gather_facts: no
   tasks:
     - name: query instances
       ec2_instance_facts:
         filters:
           "tag:aws:autoscaling:groupName": "{{asg_name}}"
       register: instance_facts

     - debug: msg={{ instance_facts.instances | selectattr('state.name', 'equalto', 'running') | map(attribute='instance_id') | list}}
     - name: group hosts
       add_host: hostname={{ item }} groups=asg-dyn-targets
       with_items: "{{ instance_facts.instances | selectattr('state.name', 'equalto', 'running') | map(attribute='private_ip_address') | list }}"

 - hosts: asg-dyn-targets
   become: yes
   roles:
     - role: "{{ role }}"