workarounds: Add option to locally attach RBD volumes on compute hosts
Building on the ``[workarounds]/disable_native_luksv1`` configurable introduced in Ia500eb614cf575ab846f64f4b69c9068274c8c1f this change introduces another workaround configurable that when enabled will connect RBD volumes to the compute host as block devices using os-brick. When used togther both options allow operators to workaround recently discovered performance issues in the libgcrypt library used by QEMU when natively decrypting LUKSv1 encrypted disks. For now the extend_volume method raises a NotImplemented error in-line with the underlying method in os-brick. Future work will be required to both support this in os-brick and wire up the required calls in the volume driver. This workaround is temporary and will be removed during the W release once all impacted distributions have been able to update their versions of the libgcrypt library. Finally os-brick 3.0.1 is now required as it provides the Id507109df80391699074773f4787f74507c4b882 fix when attempting to diconnect locally attached RBD volumes. Closes-Bug: #1869184 Change-Id: Ied3732042738a6194b635c55e0304d71a6fb66e3
This commit is contained in:
Lee Yarwood
parent
dbb58e964a
commit
7c7a25aa1e
@ -62,7 +62,7 @@ netifaces==0.10.4
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networkx==1.11
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numpy==1.14.2
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openstacksdk==0.35.0
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os-brick==2.6.2
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os-brick==3.0.1
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os-client-config==1.29.0
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os-resource-classes==0.4.0
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os-service-types==1.7.0
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@ -290,12 +290,36 @@ Enabling this workaround option will cause Nova to use the legacy dm-crypt
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based os-brick encryptor to decrypt the LUKSv1 volume.
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Note that enabling this option while using volumes that do not provide a host
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block device such as Ceph will result in a failure to either boot from or
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attach the volume.
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block device such as Ceph will result in a failure to boot from or attach the
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volume to an instance. See the ``[workarounds]/rbd_block_device`` option for a
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way to avoid this for RBD.
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Related options:
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* ``compute_driver`` (libvirt)
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* ``rbd_block_device`` (workarounds)
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"""),
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cfg.BoolOpt('rbd_volume_local_attach',
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default=False,
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help="""
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Attach RBD Cinder volumes to the compute as host block devices.
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When enabled this option instructs os-brick to connect RBD volumes locally on
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the compute host as block devices instead of natively through QEMU.
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This workaround does not currently support extending attached volumes.
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This can be used with the disable_native_luksv1 workaround configuration
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option to avoid the recently discovered performance issues found within the
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libgcrypt library.
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This workaround is temporary and will be removed during the W release once
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all impacted distributions have been able to update their versions of the
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libgcrypt library.
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Related options:
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* ``compute_driver`` (libvirt)
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* ``disable_qemu_native_luksv1`` (workarounds)
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"""),
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]
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@ -221,7 +221,9 @@ class LibvirtNetVolumeDriverTestCase(
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def test_extend_volume(self):
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device_path = '/dev/fake-dev'
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connection_info = {'data': {'device_path': device_path}}
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connection_info = {
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'driver_volume_type': 'net',
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'data': {'device_path': device_path}}
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requested_size = 20 * pow(1024, 3) # 20GiB
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@ -231,3 +233,49 @@ class LibvirtNetVolumeDriverTestCase(
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requested_size)
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self.assertEqual(requested_size, new_size)
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def test_libvirt_rbd_driver_block_connect(self):
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self.flags(rbd_volume_local_attach=True, group='workarounds')
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connection_info = self.rbd_connection(self.vol)
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libvirt_driver = net.LibvirtNetVolumeDriver(self.fake_host)
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libvirt_driver.connector.connect_volume = mock.MagicMock(
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return_value = {'path': mock.sentinel.rbd_dev})
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libvirt_driver.connect_volume(connection_info, mock.sentinel.instance)
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# Assert that the connector is called correctly and device_path updated
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libvirt_driver.connector.connect_volume.assert_called_once_with(
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connection_info['data'])
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def test_libvirt_rbd_driver_block_disconnect(self):
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self.flags(rbd_volume_local_attach=True, group='workarounds')
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connection_info = self.rbd_connection(self.vol)
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libvirt_driver = net.LibvirtNetVolumeDriver(self.fake_host)
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libvirt_driver.connector.disconnect_volume = mock.MagicMock()
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libvirt_driver.disconnect_volume(connection_info,
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mock.sentinel.instance)
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# Assert that the connector is called correctly
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libvirt_driver.connector.disconnect_volume.assert_called_once_with(
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connection_info['data'], None)
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def test_libvirt_rbd_driver_block_config(self):
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self.flags(rbd_volume_local_attach=True, group='workarounds')
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connection_info = self.rbd_connection(self.vol)
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connection_info['data']['device_path'] = '/dev/rbd0'
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libvirt_driver = net.LibvirtNetVolumeDriver(self.fake_host)
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conf = libvirt_driver.get_config(connection_info, self.disk_info)
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# Assert that the returned config is for a RBD block device
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self.assertEqual('block', conf.source_type)
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self.assertEqual('/dev/rbd0', conf.source_path)
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self.assertEqual('native', conf.driver_io)
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def test_libvirt_rbd_driver_block_extend(self):
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self.flags(rbd_volume_local_attach=True, group='workarounds')
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connection_info = self.rbd_connection(self.vol)
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libvirt_driver = net.LibvirtNetVolumeDriver(self.fake_host)
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# Assert NotImplementedError is raised for extend_volume
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self.assertRaises(NotImplementedError, libvirt_driver.extend_volume,
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connection_info, mock.sentinel.instance,
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mock.sentinel.requested_size)
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@ -10,9 +10,13 @@
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# License for the specific language governing permissions and limitations
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# under the License.
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from os_brick import exception as os_brick_exception
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from os_brick import initiator
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from os_brick.initiator import connector
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from oslo_log import log as logging
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import nova.conf
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from nova import utils
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from nova.virt.libvirt.volume import volume as libvirt_volume
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@ -25,6 +29,10 @@ class LibvirtNetVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
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def __init__(self, host):
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super(LibvirtNetVolumeDriver,
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self).__init__(host, is_block_dev=False)
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self.connector = None
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if CONF.workarounds.rbd_volume_local_attach:
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self.connector = connector.InitiatorConnector.factory(
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initiator.RBD, utils.get_root_helper(), do_local_attach=True)
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def _set_auth_config_rbd(self, conf, netdisk_properties):
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# The rbd volume driver in cinder sets auth_enabled if the rbd_user is
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@ -67,11 +75,37 @@ class LibvirtNetVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
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# secret_type is always hard-coded to 'ceph' in cinder
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conf.auth_secret_type = netdisk_properties['secret_type']
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtNetVolumeDriver,
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self).get_config(connection_info, disk_info)
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def _use_rbd_volume_local_attach(self, connection_info):
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return (connection_info['driver_volume_type'] == 'rbd' and
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CONF.workarounds.rbd_volume_local_attach)
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def connect_volume(self, connection_info, instance):
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if self._use_rbd_volume_local_attach(connection_info):
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LOG.debug("Calling os-brick to attach RBD Volume as block device",
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instance=instance)
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device_info = self.connector.connect_volume(
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connection_info['data'])
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LOG.debug("Attached RBD volume %s", device_info, instance=instance)
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connection_info['data']['device_path'] = device_info['path']
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def disconnect_volume(self, connection_info, instance):
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if self._use_rbd_volume_local_attach(connection_info):
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LOG.debug("calling os-brick to detach RBD Volume",
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instance=instance)
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try:
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self.connector.disconnect_volume(connection_info['data'], None)
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except os_brick_exception.VolumeDeviceNotFound as exc:
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LOG.warning('Ignoring VolumeDeviceNotFound: %s', exc)
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return
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LOG.debug("Disconnected RBD Volume", instance=instance)
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def _get_block_config(self, conf, connection_info):
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conf.source_type = "block"
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conf.source_path = connection_info['data']['device_path']
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conf.driver_io = "native"
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return conf
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def _get_net_config(self, conf, connection_info):
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netdisk_properties = connection_info['data']
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conf.source_type = "network"
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conf.source_protocol = connection_info['driver_volume_type']
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@ -82,8 +116,18 @@ class LibvirtNetVolumeDriver(libvirt_volume.LibvirtBaseVolumeDriver):
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self._set_auth_config_rbd(conf, netdisk_properties)
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return conf
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def get_config(self, connection_info, disk_info):
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"""Returns xml for libvirt."""
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conf = super(LibvirtNetVolumeDriver,
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self).get_config(connection_info, disk_info)
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if self._use_rbd_volume_local_attach(connection_info):
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return self._get_block_config(conf, connection_info)
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return self._get_net_config(conf, connection_info)
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def extend_volume(self, connection_info, instance, requested_size):
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# There is nothing to do for network volumes. Cinder already extended
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# the volume and there is no local block device which needs to be
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# refreshed.
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if self._use_rbd_volume_local_attach(connection_info):
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raise NotImplementedError
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# There is nothing to do for network volumes. Cinder already
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# extended the volume and there is no local block device which
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# needs to be refreshed.
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return requested_size
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@ -0,0 +1,23 @@
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---
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other:
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- |
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The ``[workarounds]/rbd_volume_local_attach`` configuration option has been
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introduced. This can be used by operators to ensure RBD volumes are
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connected to compute hosts as block devices. This can be used with
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the ``[worarounds]/disable_native_luksv1`` configuration option to
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workaround recently discovered performance issues found within the
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`libgcrypt library`__ used by QEMU when natively decrypting LUKSv1
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encrypted disks.
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This workaround does not currently support extending attached volumes.
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This workaround is temporary and will be removed during the W release once
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all impacted distributions have been able to update their versions of the
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libgcrypt library.
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.. warning:: Operators must ensure no instances are running on the compute
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host before enabling this workaround. Any instances with attached RBD
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volumes left running on the hosts will fail to migrate or stop after this
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workaround has been enabled.
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.. __: https://bugzilla.redhat.com/show_bug.cgi?id=1762765
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@ -53,7 +53,7 @@ rfc3986>=1.1.0 # Apache-2.0
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oslo.middleware>=3.31.0 # Apache-2.0
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psutil>=3.2.2 # BSD
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oslo.versionedobjects>=1.35.0 # Apache-2.0
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os-brick>=2.6.2 # Apache-2.0
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os-brick>=3.0.1 # Apache-2.0
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os-resource-classes>=0.4.0 # Apache-2.0
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os-traits>=2.2.0 # Apache-2.0
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os-vif>=1.14.0 # Apache-2.0
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