openstack-manuals/doc/user-guide/source/sdk_neutron_apis.rst

Networking

To use the information in this section, you should have a general understanding of OpenStack Networking, OpenStack Compute, and the integration between the two. You should also have access to a plug-in that implements the Networking API v2.0.

Set environment variables

Make sure that you set the relevant environment variables.

As an example, see the sample shell file that sets these variables to get credentials:

export OS_USERNAME="admin"
export OS_PASSWORD="password"
export OS_TENANT_NAME="admin"
export OS_AUTH_URL="http://IPADDRESS/v2.0"

Get credentials

The examples in this section use the get_credentials method:

def get_credentials():
    d = {}
    d['username'] = os.environ['OS_USERNAME']
    d['password'] = os.environ['OS_PASSWORD']
    d['auth_url'] = os.environ['OS_AUTH_URL']
    d['tenant_name'] = os.environ['OS_TENANT_NAME']
    return d

This code resides in the credentials.py file, which all samples import.

Use the get_credentials() method to populate and get a dictionary:

credentials = get_credentials()

Get Nova credentials

The examples in this section use the get_nova_credentials method:

def get_nova_credentials():
    d = {}
    d['username'] = os.environ['OS_USERNAME']
    d['api_key'] = os.environ['OS_PASSWORD']
    d['auth_url'] = os.environ['OS_AUTH_URL']
    d['project_id'] = os.environ['OS_TENANT_NAME']
    return d

This code resides in the credentials.py file, which all samples import.

Use the get_nova_credentials() method to populate and get a dictionary:

nova_credentials = get_nova_credentials()

Print values

The examples in this section use the print_values and print_values_server methods:

def print_values(val, type):
    if type == 'ports':
        val_list = val['ports']
    if type == 'networks':
        val_list = val['networks']
    if type == 'routers':
        val_list = val['routers']
    for p in val_list:
        for k, v in p.items():
            print("%s : %s" % (k, v))
        print('\n')


def print_values_server(val, server_id, type):
    if type == 'ports':
        val_list = val['ports']

    if type == 'networks':
        val_list = val['networks']
    for p in val_list:
        bool = False
        for k, v in p.items():
            if k == 'device_id' and v == server_id:
                bool = True
        if bool:
            for k, v in p.items():
                print("%s : %s" % (k, v))
            print('\n')

This code resides in the utils.py file, which all samples import.

Create network

The following program creates a network:

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials

network_name = 'sample_network'
credentials = get_credentials()
neutron = client.Client(**credentials)
try:
    body_sample = {'network': {'name': network_name,
                   'admin_state_up': True}}

    netw = neutron.create_network(body=body_sample)
    net_dict = netw['network']
    network_id = net_dict['id']
    print('Network %s created' % network_id)

    body_create_subnet = {'subnets': [{'cidr': '192.168.199.0/24',
                          'ip_version': 4, 'network_id': network_id}]}

    subnet = neutron.create_subnet(body=body_create_subnet)
    print('Created subnet %s' % subnet)
finally:
    print("Execution completed")

List networks

The following program lists networks:

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials
from utils import print_values

credentials = get_credentials()
neutron = client.Client(**credentials)
netw = neutron.list_networks()

print_values(netw, 'networks')

For print_values, see Print values <print-values>.

Create ports

The following program creates a port:

#!/usr/bin/env python
from neutronclient.v2_0 import client
import novaclient.v1_1.client as nvclient
from credentials import get_credentials
from credentials import get_nova_credentials

credentials = get_nova_credentials()
nova_client = nvclient.Client(**credentials)

# Replace with server_id and network_id from your environment

server_id = '9a52795a-a70d-49a8-a5d0-5b38d78bd12d'
network_id = 'ce5d204a-93f5-43ef-bd89-3ab99ad09a9a'
server_detail = nova_client.servers.get(server_id)
print(server_detail.id)

if server_detail != None:
    credentials = get_credentials()
    neutron = client.Client(**credentials)

    body_value = {
                     "port": {
                             "admin_state_up": True,
                             "device_id": server_id,
                             "name": "port1",
                             "network_id": network_id
                      }
                 }
    response = neutron.create_port(body=body_value)
    print(response)

For get_nova_credentials, see Get Nova credentials <get-nova-credentials>.

For get_credentials, see Get credentials <get-credentials>.

List ports

The following program lists ports:

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials
from utils import print_values

credentials = get_credentials()
neutron = client.Client(**credentials)
ports = neutron.list_ports()
print_values(ports, 'ports')

For get_credentials see Get credentials <get-credentials>.

For print_values, see Print values <print-values>.

List server ports

The following program lists the ports for a server:

#!/usr/bin/env python
from neutronclient.v2_0 import client
import novaclient.v1_1.client as nvclient
from credentials import get_credentials
from credentials import get_nova_credentials
from utils import print_values_server

credentials = get_nova_credentials()
nova_client = nvclient.Client(**credentials)

# change these values according to your environment

server_id = '9a52795a-a70d-49a8-a5d0-5b38d78bd12d'
network_id = 'ce5d204a-93f5-43ef-bd89-3ab99ad09a9a'
server_detail = nova_client.servers.get(server_id)
print(server_detail.id)

if server_detail is not None:
    credentials = get_credentials()
    neutron = client.Client(**credentials)
    ports = neutron.list_ports()

    print_values_server(ports, server_id, 'ports')
    body_value = {'port': {
        'admin_state_up': True,
        'device_id': server_id,
        'name': 'port1',
        'network_id': network_id,
        }}

    response = neutron.create_port(body=body_value)
    print(response)

Create router and add port to subnet

This example queries OpenStack Networking to create a router and add a port to a subnet.

1. Import the following modules:

   from neutronclient.v2_0 import client
   import novaclient.v1_1.client as nvclient
   from credentials import get_credentials
   from credentials import get_nova_credentials
   from utils import print_values_server

2. Get Nova Credentials. See :ref:'Get Nova credentials <get-nova-credentials>'.

3. Instantiate the nova_client client object by using the credentials dictionary object:

   nova_client = nvclient.Client(**credentials)

4. Create a router and add a port to the subnet:

   # Replace with network_id from your environment
   
   network_id = '81bf592a-9e3f-4f84-a839-ae87df188dc1'
   
   credentials = get_credentials()
   neutron = client.Client(**credentials)
   neutron.format = json
   request = {'router': {'name': 'router name',
                         'admin_state_up': True}}
   
   router = neutron.create_router(request)
   router_id = router['router']['id']
   # for example: '72cf1682-60a8-4890-b0ed-6bad7d9f5466'
   router = neutron.show_router(router_id)
   print(router)
   body_value = {'port': {
       'admin_state_up': True,
       'device_id': router_id,
       'name': 'port1',
       'network_id': network_id,
       }}
   
   response = neutron.create_port(body=body_value)
   print(response)
   print("Execution Completed")

Create router: complete code listing example

#!/usr/bin/env python
from neutronclient.v2_0 import client
import novaclient.v1_1.client as nvclient
from credentials import get_credentials
from credentials import get_nova_credentials
from utils import print_values_server

credentials = get_nova_credentials()
nova_client = nvclient.Client(**credentials)

# Replace with network_id from your environment

network_id = '81bf592a-9e3f-4f84-a839-ae87df188dc1'
try:
    credentials = get_credentials()
    neutron = client.Client(**credentials)
    neutron.format = 'json'
    request = {'router': {'name': 'router name',
                          'admin_state_up': True}}
    router = neutron.create_router(request)
    router_id = router['router']['id']
    # for example: '72cf1682-60a8-4890-b0ed-6bad7d9f5466'
    router = neutron.show_router(router_id)
    print(router)
    body_value = {'port': {
        'admin_state_up': True,
        'device_id': router_id,
        'name': 'port1',
        'network_id': network_id,
        }}

    response = neutron.create_port(body=body_value)
    print(response)
finally:
    print("Execution completed")

Delete a network

This example queries OpenStack Networking to delete a network.

To delete a network:

1. Import the following modules:

   from neutronclient.v2_0 import client
   from credentials import get_credentials

2. Get credentials. See Get Nova credentials <get-nova-credentials>.

3. Instantiate the neutron client object by using the credentials dictionary object:

   neutron = client.Client(**credentials)

4. Delete the network:

   body_sample = {'network': {'name': network_name,
                  'admin_state_up': True}}
   
   netw = neutron.create_network(body=body_sample)
   net_dict = netw['network']
   network_id = net_dict['id']
   print('Network %s created' % network_id)
   
   body_create_subnet = {'subnets': [{'cidr': '192.168.199.0/24',
                         'ip_version': 4, 'network_id': network_id}]}
   
   subnet = neutron.create_subnet(body=body_create_subnet)
   print('Created subnet %s' % subnet)
   
   neutron.delete_network(network_id)
   print('Deleted Network %s' % network_id)
   
   print("Execution completed")

Delete network: complete code listing example

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials

network_name = 'temp_network'
credentials = get_credentials()
neutron = client.Client(**credentials)
try:
    body_sample = {'network': {'name': network_name,
                   'admin_state_up': True}}

    netw = neutron.create_network(body=body_sample)
    net_dict = netw['network']
    network_id = net_dict['id']
    print('Network %s created' % network_id)

    body_create_subnet = {'subnets': [{'cidr': '192.168.199.0/24',
                          'ip_version': 4, 'network_id': network_id}]}

    subnet = neutron.create_subnet(body=body_create_subnet)
    print('Created subnet %s' % subnet)

    neutron.delete_network(network_id)
    print('Deleted Network %s' % network_id)
finally:
    print("Execution Completed")

List routers

This example queries OpenStack Networking to list all routers.

1. Import the following modules:

   from neutronclient.v2_0 import client
   from credentials import get_credentials
   from utils import print_values

2. Get credentials. See Get Nova credentials <get-nova-credentials>.

3. Instantiate the neutron client object by using the credentials dictionary object:

   neutron = client.Client(**credentials)

4. List the routers:

   routers_list = neutron.list_routers(retrieve_all=True)
   print_values(routers_list, 'routers')
   print("Execution completed")

   For print_values, see Print values <print-values>.

List routers: complete code listing example

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials
from utils import print_values

try:
    credentials = get_credentials()
    neutron = client.Client(**credentials)
    routers_list = neutron.list_routers(retrieve_all=True)
    print_values(routers_list, 'routers')
finally:
    print("Execution completed")

List security groups

This example queries OpenStack Networking to list security groups.

1. Import the following modules:

   from neutronclient.v2_0 import client
   from credentials import get_credentials
   from utils import print_values

2. Get credentials. See Get credentials <get-credentials>.

3. Instantiate the neutron client object by using the credentials dictionary object:

   neutron = client.Client(**credentials)

4. List Security groups

   sg = neutron.list_security_groups()
   print(sg)

List security groups: complete code listing example

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials
from utils import print_values

credentials = get_credentials()
neutron = client.Client(**credentials)
sg = neutron.list_security_groups()
print(sg)

.. note::

 OpenStack Networking security groups are case-sensitive while the
 nova-network security groups are case-insensitive.

List subnets

This example queries OpenStack Networking to list subnets.

1. Import the following modules:

   from neutronclient.v2_0 import client
   from credentials import get_credentials
   from utils import print_values

2. Get credentials. See :ref:'Get credentials <get-credentials>'.

3. Instantiate the neutron client object by using the credentials dictionary object:

   neutron = client.Client(**credentials)

4. List subnets:

   subnets = neutron.list_subnets()
   print(subnets)

List subnets: complete code listing example

#!/usr/bin/env python
from neutronclient.v2_0 import client
from credentials import get_credentials
from utils import print_values

credentials = get_credentials()
neutron = client.Client(**credentials)
subnets = neutron.list_subnets()
print(subnets)