Openstack: clean up ports that are associated with deleted instances

cleanup_ports.py

#!/usr/bin/env python
"""
    clean up ports that are associated with deleted instances
"""

import os
import novaclient
from neutronclient.neutron import client as net
from novaclient.v1_1 import client as nova


def main():
    h_nova = nova.Client(os.environ['OS_USERNAME'],
                         os.environ['OS_PASSWORD'],
                         os.environ['OS_TENANT_NAME'],
                         os.environ['OS_AUTH_URL'],
                         region_name=os.environ['OS_REGION_NAME'])

    h_net = net.Client('2.0',
                       username=os.environ['OS_USERNAME'],
                       password=os.environ['OS_PASSWORD'],
                       tenant_name=os.environ['OS_TENANT_NAME'],
                       auth_url=os.environ['OS_AUTH_URL'],
                       region_name=os.environ['OS_REGION_NAME'])

    port_list = h_net.list_ports()
    ports = port_list.get('ports', [])
    for port in ports:
        # filter out all but the ports associated with instances
        if not port['device_owner'].startswith('compute'):
            continue
        try:
            server = h_nova.servers.get(port['device_id'])
            print('Port %(port)s is associated with '
                  'server: %(server)s - %(status)s' %
                  {'port': port['id'], 'server': server.name,
                   'status': server.status})
        except novaclient.exceptions.NotFound:
            print('Removing port %(port)s as associated '
                  'instance "%(instance)s" does not exist' %
                  {'port': port['id'], 'instance': port['device_id']})
            h_net.delete_port(port['id'])

if __name__ == '__main__':
    main()