Daniel P. Berrange 72d5dfbf48 Provide plugins an oslo_config group for their setup

The plugin implementations need to be isolated from the
entity that is using os-vif. Plugins should be allowed
to define their own custom config parameters, without
needing the user of os-vif to pass further options into
the os_vif.initialize() method.

This change introduces a CONFIG_OPTS attribute on the
Plugin class. This provides a list of oslo_config
options that are to be used by the plugin. os_vif will
register these options into a group 'os_vif_$PLUGIN'
eg 'os_vif_linux_bridge'.

This gives the plugin impls the ability to have config
options in the main project conf (ie /etc/nova/nova.conf)
without exposing them directly to all of nova's own
config options.

Change-Id: I9634b474cd0d3fda09aef5800020c9415c28e3d8

2016-02-16 11:06:58 +00:00

2.3 KiB

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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. This will load all installed plugins and register the object model:

import os_vif

os_vif.initialize()

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(
    uuid=instance.uuid,
    name=instance.name,
    project_id=instance.project_id)

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()
vif = vif_objects.VIFVHostUser(id=vif_uuid,
                               address=None,
                               network=network,
                               plugin='vhostuser',
                               path='/path/to/socket',
                               mode=vif_objects.fields.VIFVHostUserMode.SERVER)

# 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...

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os-vif

Features

Usage

2.3 KiB

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