215 lines
9.1 KiB
Python
215 lines
9.1 KiB
Python
# Copyright 2018 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from kuryr.lib._i18n import _
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from kuryr.lib import constants as kl_const
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from oslo_config import cfg as oslo_cfg
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from oslo_log import log as logging
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from kuryr_kubernetes import clients
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from kuryr_kubernetes import constants
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from kuryr_kubernetes.controller.drivers import default_subnet
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from kuryr_kubernetes.controller.drivers import utils as c_utils
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from kuryr_kubernetes import exceptions
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from kuryr_kubernetes import utils
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from openstack import exceptions as os_exc
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LOG = logging.getLogger(__name__)
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namespace_subnet_driver_opts = [
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oslo_cfg.StrOpt('pod_router',
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help=_("Default Neutron router ID where pod subnet(s) is "
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"connected")),
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oslo_cfg.StrOpt('pod_subnet_pool',
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help=_("Default Neutron subnet pool ID where pod subnets "
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"get their cidr from")),
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]
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oslo_cfg.CONF.register_opts(namespace_subnet_driver_opts, "namespace_subnet")
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TAGS = oslo_cfg.CONF.neutron_defaults.resource_tags
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class NamespacePodSubnetDriver(default_subnet.DefaultPodSubnetDriver):
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"""Provides subnet for Pod port based on a Pod's namespace."""
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def get_subnets(self, pod, project_id):
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pod_namespace = pod['metadata']['namespace']
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return self.get_namespace_subnet(pod_namespace)
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def get_namespace_subnet(self, namespace, subnet_id=None):
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if not subnet_id:
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subnet_id = self._get_namespace_subnet_id(namespace)
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return {subnet_id: utils.get_subnet(subnet_id)}
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def _get_namespace_subnet_id(self, namespace):
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kubernetes = clients.get_kubernetes_client()
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try:
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net_crd_path = (f"{constants.K8S_API_CRD_NAMESPACES}/"
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f"{namespace}/kuryrnetworks/{namespace}")
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net_crd = kubernetes.get(net_crd_path)
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except exceptions.K8sResourceNotFound:
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LOG.debug("Kuryrnetwork resource not yet created, retrying...")
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raise exceptions.ResourceNotReady(namespace)
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except exceptions.K8sClientException:
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LOG.exception("Kubernetes Client Exception.")
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raise
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try:
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subnet_id = net_crd['status']['subnetId']
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except KeyError:
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LOG.debug("Subnet for namespace %s not yet created, retrying.",
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namespace)
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raise exceptions.ResourceNotReady(namespace)
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return subnet_id
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def delete_namespace_subnet(self, net_crd):
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subnet_id = net_crd['status'].get('subnetId')
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net_id = net_crd['status'].get('netId')
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if net_id:
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self._delete_namespace_network_resources(subnet_id, net_id)
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def _delete_namespace_network_resources(self, subnet_id, net_id):
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os_net = clients.get_network_client()
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if subnet_id:
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router_id = oslo_cfg.CONF.namespace_subnet.pod_router
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try:
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clients.handle_neutron_errors(
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os_net.remove_interface_from_router, router_id,
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subnet_id=subnet_id)
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except os_exc.NotFoundException as e:
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# Nothing to worry about, either router or subnet is no more,
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# or subnet is already detached.
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LOG.debug(e.message)
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pass
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except os_exc.SDKException:
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LOG.exception("Error deleting subnet %(subnet)s from router "
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"%(router)s.",
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{'subnet': subnet_id, 'router': router_id})
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raise
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try:
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os_net.delete_network(net_id)
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except os_exc.ConflictException:
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LOG.warning("One or more ports in use on the network %s. "
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"Deleting leftovers ports before retrying", net_id)
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# NOTE(dulek): '' is there because Neutron seems to unset
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# device_owner on detach.
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leftover_ports = [p for p in os_net.ports(network_id=net_id)
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if p.device_owner in
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['', 'trunk:subport', kl_const.DEVICE_OWNER]]
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c_utils.delete_ports(leftover_ports)
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raise exceptions.ResourceNotReady(net_id)
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except os_exc.SDKException:
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LOG.exception("Error deleting network %s.", net_id)
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raise
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def create_network(self, ns, project_id):
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os_net = clients.get_network_client()
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ns_name = ns['metadata']['name']
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ns_uid = ns['metadata']['uid']
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net_name = c_utils.get_resource_name(ns_name, ns_uid)
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old_net_name = c_utils.get_resource_name(ns_name, prefix='ns/',
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suffix='-net')
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# TODO(gryf): remove old_net_name support in next release, and precise
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# the query by adding additional query parameter 'description' which
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# should contain namespace uid.
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networks = os_net.networks(name=(net_name, old_net_name))
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tags = ",".join(TAGS)
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try:
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# NOTE(ltomasbo): only one network must exists
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net = next(networks)
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# NOTE(gryf): It might happen, that network has been created, but
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# for some reason tagging has failed.
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if TAGS and not set(TAGS).issubset(set(net.tags)):
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c_utils.tag_neutron_resources([net], exceptions=True)
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return net.id
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except (StopIteration, ValueError):
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LOG.debug('Network does not exist. Creating.')
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mtu_cfg = oslo_cfg.CONF.neutron_defaults.network_device_mtu
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attrs = {'name': net_name, 'project_id': project_id,
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'description': tags}
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if mtu_cfg:
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attrs['mtu'] = mtu_cfg
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try:
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net = os_net.create_network(**attrs)
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except os_exc.SDKException:
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LOG.exception("Error creating neutron resources for the namespace "
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"%s", ns_name)
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raise
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c_utils.tag_neutron_resources([net], exceptions=True)
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return net.id
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def create_subnet(self, ns, project_id, net_id):
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os_net = clients.get_network_client()
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ns_name = ns['metadata']['name']
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ns_uid = ns['metadata']['uid']
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tags = ",".join(TAGS)
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# NOTE(gryf): assumption is, that all the subnets (well, currently
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# only one) in specific k8s namespaces are under exactly one network,
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# which have proper namespace uid in its description, so there is no
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# need to put it on the subnet as well.
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subnet_name = c_utils.get_resource_name(ns_name, ns_uid)
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subnets = os_net.subnets(network_id=net_id)
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try:
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# NOTE(ltomasbo): only one subnet must exists
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subnet = next(subnets)
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# NOTE(gryf): same situation as in networks.
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if TAGS and not set(TAGS).issubset(set(subnet.tags)):
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c_utils.tag_neutron_resources([subnet], exceptions=True)
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return subnet.id, subnet.cidr
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except StopIteration:
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LOG.debug('Subnet does not exist. Creating.')
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# create subnet with namespace as name
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subnet_pool_id = oslo_cfg.CONF.namespace_subnet.pod_subnet_pool
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ip_version = utils.get_subnetpool_version(subnet_pool_id)
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try:
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neutron_subnet = (os_net
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.create_subnet(network_id=net_id,
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description=tags,
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ip_version=ip_version,
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name=subnet_name,
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enable_dhcp=False,
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subnetpool_id=subnet_pool_id,
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project_id=project_id))
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except os_exc.ConflictException:
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LOG.debug("Max number of retries on neutron side achieved, "
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"raising ResourceNotReady to retry subnet creation "
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"for %s", subnet_name)
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raise exceptions.ResourceNotReady(subnet_name)
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c_utils.tag_neutron_resources([neutron_subnet], exceptions=True)
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return neutron_subnet.id, neutron_subnet.cidr
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def add_subnet_to_router(self, subnet_id):
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os_net = clients.get_network_client()
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router_id = oslo_cfg.CONF.namespace_subnet.pod_router
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try:
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# connect the subnet to the router
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os_net.add_interface_to_router(router_id, subnet_id=subnet_id)
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except os_exc.BadRequestException:
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LOG.debug("Subnet %s already connected to the router", subnet_id)
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except os_exc.SDKException:
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LOG.exception("Error attaching the subnet %s to the router",
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subnet_id)
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raise
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return router_id
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