generate ansible inventory from openstack.

gen_inventory.py

#!/usr/bin/env python
import os
from novaclient import client as nclient


def get_nova_client():
    auth_url = os.environ['OS_AUTH_URL']
    tenant = os.environ['OS_TENANT_NAME']
    username = os.environ['OS_USERNAME']
    password = os.environ['OS_PASSWORD']

    return nclient.Client('2', username=username, api_key=password, project_id=tenant, auth_url=auth_url)


def main(args):
    no = get_nova_client()

    servers = no.servers.list()

    for s in servers:
        for net, address in s.addresses.items():
            for a in address:
                print s.name + "." + net + " ansible_ssh_host=" + a['addr'] + " ansible_ssh_user=ubuntu"

if __name__ == '__main__':
    import sys
    main(sys.argv[1:])