openstack
/
nova
Code Issues Proposed changes

Add --enable and --disable options to nova-manage update_cell 

Through these new options, users can enable or disable a cell
through the CLI.

Related to blueprint cell-disable

Change-Id: I761f2e2b1f1cc2c605f7da504a8c8647d6d6a45e
This commit is contained in:
Surya Seetharaman 2018-03-22 18:54:09 +01:00
parent ba083b0c98
commit cd01cbe65e
4 changed files with 126 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
doc/source/cli/nova-manage.rst
View File

@ -237,7 +237,7 @@ Nova Cells v2
If the cell is not found by uuid, this command will return an exit code
of 1. Otherwise, the exit code will be 0.
``nova-manage cell_v2 update_cell --cell_uuid <cell_uuid> [--name <cell_name>] [--transport-url <transport_url>] [--database_connection <database_connection>]``
``nova-manage cell_v2 update_cell --cell_uuid <cell_uuid> [--name <cell_name>] [--transport-url <transport_url>] [--database_connection <database_connection>] [--disable] [--enable]``
Updates the properties of a cell by the given uuid. If a
database_connection is not specified, it will attempt to use the one
defined by ``[database]/connection`` in the configuration file. If a
@ -246,7 +246,10 @@ Nova Cells v2
found by uuid, this command will return an exit code of 1. If the provided
transport_url or/and database_connection is/are same as another cell,
this command will return an exit code of 3. If the properties cannot be set,
this will return 2. Otherwise, the exit code will be 0.
this will return 2. If an attempt is made to disable and enable a cell at the
same time, this command will return an exit code of 4. If an attempt is made
to disable or enable cell0 this command will return an exit code of 5.
Otherwise, the exit code will be 0.
.. note::
@ -254,6 +257,9 @@ Nova Cells v2
running system will NOT result in all nodes immediately using the new
values. Use caution when changing these values.
The scheduler will not notice that a cell has been enabled/disabled until
it is restarted or sent the SIGHUP signal.
``nova-manage cell_v2 delete_host --cell_uuid <cell_uuid> --host <host>``
Delete a host by the given host name and the given cell uuid. Returns 0
if the empty host is found and deleted successfully, 1 if a cell with

33
nova/cmd/manage.py
View File

@ -1541,19 +1541,32 @@ class CellV2Commands(object):
dest='db_connection',
help=_('Set the cell database_connection. NOTE that running nodes '
'will not see the change until restart!'))
@args('--disable', action='store_true', dest='disable',
help=_('Disables the cell. Note that the scheduling will be blocked '
'to this cell until its enabled and followed by a SIGHUP of '
'nova-scheduler service.'))
@args('--enable', action='store_true', dest='enable',
help=_('Enables the cell. Note that this makes a disabled cell '
'available for scheduling after a SIGHUP of the '
'nova-scheduler service'))
def update_cell(self, cell_uuid, name=None, transport_url=None,
db_connection=None):
db_connection=None, disable=False, enable=False):
"""Updates the properties of a cell by the given uuid.
If the cell is not found by uuid, this command will return an exit
code of 1. If the provided transport_url or/and database_connection
is/are same as another cell, this command will return an exit code
of 3. If the properties cannot be set, this will return 2.
of 3. If the properties cannot be set, this will return 2. If an
attempt is made to disable and enable a cell at the same time, this
command will exit with a return code of 4. If an attempt is made to
disable or enable cell0 this command will exit with a return code of 5.
Otherwise, the exit code will be 0.
NOTE: Updating the transport_url or database_connection fields on
a running system will NOT result in all nodes immediately using the
new values. Use caution when changing these values.
NOTE (tssurya): The scheduler will not notice that a cell has been
enabled/disabled until it is restarted or sent the SIGHUP signal.
"""
ctxt = context.get_admin_context()
try:
@ -1580,6 +1593,22 @@ class CellV2Commands(object):
if db_connection:
cell_mapping.database_connection = db_connection
if disable and enable:
print(_('Cell cannot be disabled and enabled at the same time.'))
return 4
if disable or enable:
if cell_mapping.is_cell0():
print(_('Cell0 cannot be disabled.'))
return 5
elif disable and not cell_mapping.disabled:
cell_mapping.disabled = True
elif enable and cell_mapping.disabled:
cell_mapping.disabled = False
elif disable and cell_mapping.disabled:
print(_('Cell %s is already disabled') % cell_uuid)
elif enable and not cell_mapping.disabled:
print(_('Cell %s is already enabled') % cell_uuid)
try:
cell_mapping.save()
except Exception as e:

83
nova/tests/unit/test_nova_manage.py
View File

@ -2062,6 +2062,89 @@ class CellV2CommandsTestCase(test.NoDBTestCase):
output = self.output.getvalue().strip()
self.assertEqual('', output)
def test_update_cell_disable_and_enable(self):
ctxt = context.get_admin_context()
objects.CellMapping(context=ctxt, uuid=uuidsentinel.cell1,
name='cell1',
transport_url='fake://mq',
database_connection='fake:///db').create()
self.assertEqual(4, self.commands.update_cell(uuidsentinel.cell1,
disable=True,
enable=True))
output = self.output.getvalue().strip()
self.assertEqual('Cell cannot be disabled and enabled at the same '
'time.', output)
def test_update_cell_disable_cell0(self):
ctxt = context.get_admin_context()
uuid0 = objects.CellMapping.CELL0_UUID
objects.CellMapping(context=ctxt, uuid=uuid0, name='cell0',
transport_url='fake://mq',
database_connection='fake:///db').create()
self.assertEqual(5, self.commands.update_cell(uuid0, disable=True))
output = self.output.getvalue().strip()
self.assertEqual('Cell0 cannot be disabled.', output)
def test_update_cell_disable_success(self):
ctxt = context.get_admin_context()
uuid = uuidsentinel.cell1
objects.CellMapping(context=ctxt, uuid=uuid,
name='cell1',
transport_url='fake://mq',
database_connection='fake:///db').create()
cm = objects.CellMapping.get_by_uuid(ctxt, uuid)
self.assertFalse(cm.disabled)
self.assertEqual(0, self.commands.update_cell(uuid, disable=True))
cm = objects.CellMapping.get_by_uuid(ctxt, uuid)
self.assertTrue(cm.disabled)
output = self.output.getvalue().strip()
self.assertEqual('', output)
def test_update_cell_enable_success(self):
ctxt = context.get_admin_context()
uuid = uuidsentinel.cell1
objects.CellMapping(context=ctxt, uuid=uuid,
name='cell1',
transport_url='fake://mq',
database_connection='fake:///db',
disabled=True).create()
cm = objects.CellMapping.get_by_uuid(ctxt, uuid)
self.assertTrue(cm.disabled)
self.assertEqual(0, self.commands.update_cell(uuid, enable=True))
cm = objects.CellMapping.get_by_uuid(ctxt, uuid)
self.assertFalse(cm.disabled)
output = self.output.getvalue().strip()
self.assertEqual('', output)
def test_update_cell_disable_already_disabled(self):
ctxt = context.get_admin_context()
objects.CellMapping(context=ctxt, uuid=uuidsentinel.cell1,
name='cell1',
transport_url='fake://mq',
database_connection='fake:///db',
disabled=True).create()
cm = objects.CellMapping.get_by_uuid(ctxt, uuidsentinel.cell1)
self.assertTrue(cm.disabled)
self.assertEqual(0, self.commands.update_cell(uuidsentinel.cell1,
disable=True))
self.assertTrue(cm.disabled)
output = self.output.getvalue().strip()
self.assertIn('is already disabled', output)
def test_update_cell_enable_already_enabled(self):
ctxt = context.get_admin_context()
objects.CellMapping(context=ctxt, uuid=uuidsentinel.cell1,
name='cell1',
transport_url='fake://mq',
database_connection='fake:///db').create()
cm = objects.CellMapping.get_by_uuid(ctxt, uuidsentinel.cell1)
self.assertFalse(cm.disabled)
self.assertEqual(0, self.commands.update_cell(uuidsentinel.cell1,
enable=True))
self.assertFalse(cm.disabled)
output = self.output.getvalue().strip()
self.assertIn('is already enabled', output)
def test_list_hosts(self):
ctxt = context.get_admin_context()
# create the cell mapping

4
releasenotes/notes/add-disabled-to-create_cell-feb1643ec4716eb2.yaml
View File

@ -4,3 +4,7 @@ features:
A new option ``disabled`` has been added to nova-manage cell_v2 create_cell
command by which users can create pre-disabled cells. Hence unless such cells
are enabled, no VMs will be spawned on the hosts in these cells.
- |
Two new options ``--enable`` and ``--disable`` have been added to the
``nova-manage cell_v2 update_cell`` command. Using these flags users can enable
or disable scheduling to a cell.