def test_backing_file_does_not_fail_if_json_has_no_such_file(self):
json = """{
"virtual-size": 7516192768,
"filename": "/var/lib/nova/instances/6a475e2d-993a-453a-a8be-
b1ab549f54a7/disk",
"cluster-size": 65536,
"format": "qcow2",
"actual-size": 19398656,
"format-specific": {
"type": "qcow2",
"data": {
"compat": "1.1",
"lazy-refcounts": false
}
},
"dirty-flag": false
}"""
remote_runner = mock.Mock()
remote_runner.run.return_value = json
lv = libvirt.Libvirt(remote_runner)
try:
backing_file = lv.get_backing_file('inst-id')
self.assertIsNone(backing_file)
except:
self.fail("get_backing_file should return None if backing file is "
"not present in qemu-img")
def test_backing_file_returns_none_in_case_of_error(self):
remote_runner = mock.Mock()
remote_runner.run.return_value = None
lv = libvirt.Libvirt(remote_runner)
try:
backing = lv.get_backing_file("some-id")
self.assertIsNone(backing)
except Exception:
self.fail("get_backing_volume should return None in case of "
"failure")
def test_backing_file_returns_expected_value(self):
qemu_img_info = """{
"virtual-size": 41126400,
"filename": "disk",
"cluster-size": 65536,
"format": "qcow2",
"actual-size": 1122304,
"format-specific": {
"type": "qcow2",
"data": {
"compat": "1.1",
"lazy-refcounts": false
}
},
"backing-filename": "/var/lib/nova/instances/_base/migrationDisk",
"dirty-flag": false
}"""
remote_runner = mock.Mock()
remote_runner.run.return_value = qemu_img_info
lv = libvirt.Libvirt(remote_runner)
backing_file = lv.get_backing_file('inst-id')
self.assertEqual(backing_file,
"/var/lib/nova/instances/_base/migrationDisk")
def run(self, info=None, **kwargs):
new_id, instance = info[utils.INSTANCES_TYPE].items()[0]
old_id = instance['old_id']
dst_compute = self.dst_cloud.resources[utils.COMPUTE_RESOURCE]
src_compute = self.src_cloud.resources[utils.COMPUTE_RESOURCE]
dst_compute.change_status('active', instance_id=new_id)
dst_instance = dst_compute.get_instance(new_id)
src_instance = src_compute.get_instance(old_id)
# do not attempt to live migrate inactive instances
if src_instance.status.lower() not in ['active', 'verify_resize']:
LOG.debug(
"Skipping live migration of VM '%s', because it's "
"inactive", src_instance.name)
return
src_host = instance_host(src_instance)
dst_host = instance_host(dst_instance)
src_runner = remote_runner.RemoteRunner(src_host,
cfglib.CONF.src.ssh_user)
dst_runner = remote_runner.RemoteRunner(dst_host,
cfglib.CONF.dst.ssh_user)
src_libvirt = libvirt.Libvirt(src_runner)
dst_libvirt = libvirt.Libvirt(dst_runner)
src_virsh_name = instance_libvirt_name(src_instance)
dst_virsh_name = instance_libvirt_name(dst_instance)
src_vm_xml = src_libvirt.get_xml(src_virsh_name)
dst_vm_xml = dst_libvirt.get_xml(dst_virsh_name)
src_vm_xml.disk_file = dst_vm_xml.disk_file
src_vm_xml.serial_file = dst_vm_xml.serial_file
src_vm_xml.console_file = dst_vm_xml.console_file
src_vm_xml.interfaces = dst_vm_xml.interfaces
dst_backing_file = dst_libvirt.get_backing_file(new_id)
src_backing_file = src_libvirt.get_backing_file(old_id)
migration_backing_file = os.path.join(
libvirt.nova_instances_path, '_base',
'migration_disk_{}'.format(old_id))
dst_compute.wait_for_status(new_id, dst_compute.get_status, 'active')
with files.RemoteTempFile(src_runner,
"migrate-{}".format(old_id),
src_vm_xml.dump()) as migration_file,\
files.RemoteSymlink(src_runner,
src_backing_file,
migration_backing_file),\
files.RemoteSymlink(dst_runner,
dst_backing_file,
migration_backing_file),\
ubuntu.StopNovaCompute(dst_runner),\
libvirt.QemuBackingFileMover(src_libvirt.runner,
migration_backing_file,
old_id):
destroyer = libvirt.DestNovaInstanceDestroyer(
dst_libvirt, dst_compute, dst_virsh_name, dst_instance.id)
try:
destroyer.do()
src_libvirt.live_migrate(src_virsh_name, dst_host,
migration_file.filename)
except remote_runner.RemoteExecutionError:
destroyer.undo()
finally:
dst_libvirt.move_backing_file(dst_backing_file, new_id)