amazon ec2 - Ansible add_host not adding to hosts file -

ansible version: 1.9.2

i'm running playbook launch ec2 instance. have site.yml variables , use role launch ec2 instance. here's main.yml ec2_launch

--- - name: create ec2 instance   ec2:     key_name: "{{ keypair }}"     group_id: "{{ security_group }}"     instance_type: "{{ instance_type }}"     image: "{{ image }}"     region: "{{ region }}"     vpc_subnet_id: "{{ vpc_subnet_id }}"     assign_public_ip: yes     wait: true     instance_tags:       name: "{{ instance_tag }}"       environment: "{{ instance_tag2 }}"     exact_count: 1     count_tag:       name: "{{ instance_tag }}"       environment: "{{ instance_tag2 }}"     monitoring: yes   register: ec2 - name: add ec2 instance hosts   add_host: name={{ item.private_ip }} groups=group_name   with_items: ec2.instances - name: wait ssh   wait_for: host={{ item.private_ip }} port=22 delay=60 timeout=320 state=started   with_items: ec2.instances 

when run -vvv option, output during add_hosts:

task: [ec2_launch | add ec2 instance hosts] ******************************** creating host via 'add_host': hostname=10.50.101.93 added host group via add_host module: group_name 

the ip correct , group name correct when check ansible hosts file, has not been modified. made sure include [group_name] in hosts file. there no errors during run , not sure why it's not being added file.

there's 'add_host' example on page: http://docs.ansible.com/ec2_module.html instead of name , groups, use hostname, groupname (which believe old). i've tried well. not sure i'm missing.

the add_host task not add host file, adds in-memory list of hosts.

adding hosts file wouldn't work in cases- instance, aws users use ./ec2.py script, binary executable replaces text-based hosts file.