x/python-ganttclient
Code Issues Proposed changes

Implementation for XenServer migrations. There are several places for optimization but I based the current implementation on the chance scheduler just to be safe. Beyond that, a few features are missing, such as ensuring the IP address is transferred along with the migrated instance. This will be added in a subsequent patch. Finally, everything is implemented through the Openstack API resize hooks, but actual resizing of the instance RAM and hard drive space is not yet implemented.

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This commit is contained in:
Cerberus
2011-03-07 18:30:36 +00:00
committed by Tarmac
parent 67ad7d2d37 25e81bdaaf
commit fa23398883
4 changed files with 104 additions and 2 deletions
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2
nova/rpc.py
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@@ -123,7 +123,7 @@ class Consumer(messaging.Consumer):
LOG.error(_("Reconnected to queue"))
self.failed_connection = False
# NOTE(vish): This is catching all errors because we really don't
# exceptions to be logged 10 times a second if some
# want exceptions to be logged 10 times a second if some
# persistent failure occurs.
except Exception: # pylint: disable-msg=W0703
if not self.failed_connection:

24
nova/tests/test_compute.py
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@@ -57,7 +57,7 @@ class ComputeTestCase(test.TestCase):
self.manager.delete_project(self.project)
super(ComputeTestCase, self).tearDown()
def _create_instance(self):
def _create_instance(self, params={}):
"""Create a test instance"""
inst = {}
inst['image_id'] = 'ami-test'
@@ -68,6 +68,7 @@ class ComputeTestCase(test.TestCase):
inst['instance_type'] = 'm1.tiny'
inst['mac_address'] = utils.generate_mac()
inst['ami_launch_index'] = 0
inst.update(params)
return db.instance_create(self.context, inst)['id']
def _create_group(self):
@@ -268,9 +269,30 @@ class ComputeTestCase(test.TestCase):
self.compute.terminate_instance(self.context, instance_id)
def test_resize_instance(self):
"""Ensure instance can be migrated/resized"""
instance_id = self._create_instance()
context = self.context.elevated()
self.compute.run_instance(self.context, instance_id)
db.instance_update(self.context, instance_id, {'host': 'foo'})
self.compute.prep_resize(context, instance_id)
migration_ref = db.migration_get_by_instance_and_status(context,
instance_id, 'pre-migrating')
self.compute.resize_instance(context, instance_id,
migration_ref['id'])
self.compute.terminate_instance(context, instance_id)
def test_get_by_flavor_id(self):
type = instance_types.get_by_flavor_id(1)
self.assertEqual(type, 'm1.tiny')
def test_resize_same_source_fails(self):
"""Ensure instance fails to migrate when source and destination are
the same host"""
instance_id = self._create_instance()
self.compute.run_instance(self.context, instance_id)
self.assertRaises(exception.Error, self.compute.prep_resize,
self.context, instance_id)
self.compute.terminate_instance(self.context, instance_id)
type = instance_types.get_by_flavor_id("1")
self.assertEqual(type, 'm1.tiny')

38
nova/tests/test_xenapi.py
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@@ -346,6 +346,44 @@ class XenAPIDiffieHellmanTestCase(test.TestCase):
super(XenAPIDiffieHellmanTestCase, self).tearDown()
class XenAPIMigrateInstance(test.TestCase):
"""
Unit test for verifying migration-related actions
"""
def setUp(self):
super(XenAPIMigrateInstance, self).setUp()
self.stubs = stubout.StubOutForTesting()
FLAGS.target_host = '127.0.0.1'
FLAGS.xenapi_connection_url = 'test_url'
FLAGS.xenapi_connection_password = 'test_pass'
db_fakes.stub_out_db_instance_api(self.stubs)
stubs.stub_out_get_target(self.stubs)
xenapi_fake.reset()
self.values = {'name': 1, 'id': 1,
'project_id': 'fake',
'user_id': 'fake',
'image_id': 1,
'kernel_id': 2,
'ramdisk_id': 3,
'instance_type': 'm1.large',
'mac_address': 'aa:bb:cc:dd:ee:ff',
}
stubs.stub_out_migration_methods(self.stubs)
def test_migrate_disk_and_power_off(self):
instance = db.instance_create(self.values)
stubs.stubout_session(self.stubs, stubs.FakeSessionForMigrationTests)
conn = xenapi_conn.get_connection(False)
conn.migrate_disk_and_power_off(instance, '127.0.0.1')
def test_attach_disk(self):
instance = db.instance_create(self.values)
stubs.stubout_session(self.stubs, stubs.FakeSessionForMigrationTests)
conn = xenapi_conn.get_connection(False)
conn.attach_disk(instance, {'base_copy': 'hurr', 'cow': 'durr'})
class XenAPIDetermineDiskImageTestCase(test.TestCase):
"""
Unit tests for code that detects the ImageType

42
nova/tests/xenapi/stubs.py
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@@ -20,6 +20,7 @@ from nova.virt import xenapi_conn
from nova.virt.xenapi import fake
from nova.virt.xenapi import volume_utils
from nova.virt.xenapi import vm_utils
from nova.virt.xenapi import vmops
def stubout_instance_snapshot(stubs):
@@ -217,3 +218,44 @@ class FakeSessionForVolumeFailedTests(FakeSessionForVolumeTests):
def SR_forget(self, _1, ref):
pass
class FakeSessionForMigrationTests(fake.SessionBase):
"""Stubs out a XenAPISession for Migration tests"""
def __init__(self, uri):
super(FakeSessionForMigrationTests, self).__init__(uri)
def stub_out_migration_methods(stubs):
def fake_get_snapshot(self, instance):
return 'foo', 'bar'
@classmethod
def fake_get_vdi(cls, session, vm_ref):
vdi_ref = fake.create_vdi(name_label='derp', read_only=False,
sr_ref='herp', sharable=False)
vdi_rec = session.get_xenapi().VDI.get_record(vdi_ref)
return vdi_ref, {'uuid': vdi_rec['uuid'], }
def fake_shutdown(self, inst, vm, method='clean'):
pass
@classmethod
def fake_sr(cls, session, *args):
pass
@classmethod
def fake_get_sr_path(cls, *args):
return "fake"
def fake_destroy(*args, **kwargs):
pass
stubs.Set(vmops.VMOps, '_destroy', fake_destroy)
stubs.Set(vm_utils.VMHelper, 'scan_default_sr', fake_sr)
stubs.Set(vm_utils.VMHelper, 'scan_sr', fake_sr)
stubs.Set(vmops.VMOps, '_get_snapshot', fake_get_snapshot)
stubs.Set(vm_utils.VMHelper, 'get_vdi_for_vm_safely', fake_get_vdi)
stubs.Set(xenapi_conn.XenAPISession, 'wait_for_task', lambda x, y, z: None)
stubs.Set(vm_utils.VMHelper, 'get_sr_path', fake_get_sr_path)
stubs.Set(vmops.VMOps, '_shutdown', fake_shutdown)