Let use 'os_server' command from module 'Cloud' [http://docs.ansible.com/ansible/os_server_module.html]. Variables are defined in ./group_vars/all.
$vi launch_compute.yml
- name: launch a compute instance
hosts: localhost
gather_facts: False
tasks:
- name: Create and launch the VM
os_server:
auth:
auth_url: https://openstack-identity.mycompany.com/v2.0
username: "{{ AuthUserName }}"
password: "{{ AuthPassword }}"
project_name: "{{ TenantName }}"
state: present
validate_certs: False
name: "MyOwnPersonalInstance"
image: "{{ ImageName }}"
key_name: "{{ InfraKey }}"
timeout: 200
flavor: "{{ FlavorName }}"
security_groups: "{{ SecurityGroup }}"
network: "{{ NetworkName }}"
auto_ip: yes
$ ansible-playbook -s launch_compute.yml
[WARNING]: provided hosts list is empty, only localhost is available
PLAY [launch a compute instance] ***********************************************
TASK [Create and launch the VM] ************************************************
changed: [localhost]
PLAY RECAP *********************************************************************
localhost : ok=1 changed=1 unreachable=0 failed=0