• http://docs.ansible.com

• http://docs.ansible.com/ansible/latest/intro_dynamic_inventory.html#example-openstack-external-inventory-script
• https://community.runabove.com/kb/en/instances/use-openstack-command-line-tools.html

Install Openstack python client

sudo apt-get install python-os-client-config python-shade

Get the Openstack.rc file

Then source it (api password will be asked), and give a try

$ wget https://raw.githubusercontent.com/ansible/ansible/devel/contrib/inventory/openstack.py
$ chmod +x openstack.py
$ source xxxxxxxxxxx-openrc.sh
$ ./openstack.py --list