def setup(self, network):
\"\"\"Create and initialize a device for network's DHCP on this host.\"\"\"
try:
port = self.setup_dhcp_port(network)
except Exception:
with excutils.save_and_reraise_exception():
# clear everything out so we don't leave dangling interfaces
# if setup never succeeds in the future.
self._cleanup_stale_devices(network, dhcp_port=None)
self._update_dhcp_port(network, port)
interface_name = self.get_interface_name(network, port)
if ip_lib.ensure_device_is_ready(interface_name,
namespace=network.namespace):
LOG.debug('Reusing existing device: %s.', interface_name)
else:
try:
self.plug(network, port, interface_name)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Unable to plug DHCP port for '
'network %s. Releasing port.'),
network.id)
self.plugin.release_dhcp_port(network.id, port.device_id)
self.fill_dhcp_udp_checksums(namespace=network.namespace)
ip_cidrs = []
for fixed_ip in port.fixed_ips:
subnet = fixed_ip.subnet
if not ipv6_utils.is_auto_address_subnet(subnet):
net = netaddr.IPNetwork(subnet.cidr)
ip_cidr = '%s\/%s' % (fixed_ip.ip_address, net.prefixlen)
ip_cidrs.append(ip_cidr)
if self.driver.use_gateway_ips:
# For each DHCP‐enabled subnet, add that subnet's gateway
# IP address to the Linux device for the DHCP port.
for subnet in network.subnets:
if not subnet.enable_dhcp:
continue
gateway = subnet.gateway_ip
if gateway:
net = netaddr.IPNetwork(subnet.cidr)
ip_cidrs.append('%s\/%s' % (gateway, net.prefixlen))
if self.conf.force_metadata or self.conf.enable_isolated_metadata:
ip_cidrs.append(METADATA_DEFAULT_CIDR)
self.driver.init_l3(interface_name, ip_cidrs,
namespace=network.namespace)
self._set_default_route(network, interface_name)
self._cleanup_stale_devices(network, port)
