os-vif

A library for plugging and unplugging virtual interfaces in OpenStack.

Features

• A base VIF plugin class that supplies a plug() and unplug() interface
• Versioned objects that represent a virtual interface and its components

Usage

The interface to the os_vif library is very simple. To begin using the library, first call the os_vif.initialize() function, supplying a set of keyword arguments for configuration options:

import os_vif

os_vif.initialize(libvirt_virt_type='kvm',
                  network_device_mtu=1500,
                  vlan_interface='eth1',
                  use_ipv6=False,
                  iptables_top_regex='',
                  iptables_bottom_regex='',
                  iptables_drop_action='DROP',
                  forward_bridge_interface=['all'])

Once the os_vif library is initialized, there are only two other library functions: os_vif.plug() and os_vif.unplug(). Both methods accept a single argument of type `os_vif.objects.VIF`:

import uuid

from nova import objects as nova_objects
from os_vif import exception as vif_exc
from os_vif import objects as vif_objects
from os_vif import vnic_types

instance_uuid = 'd7a730ca-3c28-49c3-8f26-4662b909fe8a'
instance = nova_objects.Instance.get_by_uuid(instance_uuid)
instance_info = vif_objects.InstanceInfo.from_nova_instance(instance)

subnet = vif_objects.Subnet(cidr='192.168.1.0/24')
subnets = vif_objects.SubnetList([subnet])
network = vif_objects.Network(label='tenantnet',
                              subnets=subnets,
                              multi_host=False,
                              should_provide_vlan=False,
                              should_provide_bridge=False)

vif_uuid = uuid.uuid4()
details = {
    'ovs_hybrid_plug': True,
    'vhostuser_socket': '/path/to/socket',
}
vif = vif_objects.VIF(id=vif_uuid,
                      address=None,
                      network=network,
                      plugin='vhostuser',
                      details=details,
                      profile=None,
                      vnic_type=vnic_types.NORMAL,
                      active=True,
                      preserve_on_delete=False,
                      instance_info=instance_info)

# Now do the actual plug operations to connect the VIF to
# the backing network interface.
try:
    os_vif.plug(vif)
except vif_exc.PlugException as err:
    # Handle the failure...

# If you are removing a virtual machine and its interfaces,
# you would use the unplug() operation:
try:
    os_vif.unplug(vif)
except vif_exc.UnplugException as err:
    # Handle the failure...