@palbhan:
> [...] we checked the share storage is true or not before migrating.
So, did you do a resize which results in a cold-migration (=rebuild) of
the instance to another server?
> I think checking the share storage using " shared_storage =
> (dest == self.get_host_ip_addr())" is not the right way.
What makes you think this way? This is a check if the resize/rebuild
of the instance is happening on the very same host.
> When I always return true from _is_storage_shared_with function,
> the Nova resize works fine.
If your setup will never(!) change, this could work, but I wouldn't
recommend doing it this way.
I assume that your setup doesn't have a valid SSH setup between the
*compute nodes*, at least the error "'Host key verification failed.\r\n'"
makes me think this way. The "cloud admin guide" states [1]:
Ensure you can access SSH without a password and without
StrictHostKeyChecking between HostB and HostC as nova user
(set with the owner of nova-compute service). Direct access
from one compute host to another is needed to copy the VM file
across. It is also needed to detect if the source and target
compute nodes share a storage subsystem.
I think as soon as you did that SSH configuration between your compute
nodes the issue will be gone. Because of this I close this bug report
as invalid. If you think I got you wrong and this is a valid bug, please
reopen it by setting the status back to "New".
References:
[1]
http://docs.openstack.org/admin-guide-cloud/compute-configuring-migrations.html
** Changed in: nova
Status: New => Invalid
** Tags added: libvirt
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https://bugs.launchpad.net/bugs/1507521
Title:
Nova Resize is failing for shared storage between Compute node
Status in OpenStack Compute (nova):
Invalid
Bug description:
Nova Version: 2.22.0
I have share nfs storage mounting the /var/lib/nova between two
compute nodes. When I tried to re-sizing the instance using nova
resize command, it is failing and below is the output of log
2015-10-19 05:13:15.582 14325 ERROR oslo_messaging.rpc.dispatcher
[req-5cb16661-74ec-4faf-93cd-044e597cc9de d4209dcd86b84fc584f8b3b72bee0c64
da6c9fa9be0046dda47e9bd6caf3908a - - -] Exception during message handling:
Resize error: not able to execute ssh command: Unexpected error while running
command.
Command: ssh 20.20.20.3 mkdir -p
/var/lib/nova/instances/744d6341-023f-49cd-9d93-7bae7eb32653
Exit code: 255
Stdout: u''
Stderr: u'Host key verification failed.\r\n'
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher Traceback
(most recent call last):
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142,
in _dispatch_and_reply
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
executor_callback))
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186,
in _dispatch
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
executor_callback)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130,
in _do_dispatch
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher result
= func(ctxt, **new_args)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6748, in
resize_instance
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
clean_shutdown=clean_shutdown)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher payload)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
six.reraise(self.type_, self.value, self.tb)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher return
f(self, context, *args, **kw)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 327, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
LOG.warning(msg, e, instance_uuid=instance_uuid)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
six.reraise(self.type_, self.value, self.tb)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 298, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher return
function(self, context, *args, **kwargs)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 377, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher return
function(self, context, *args, **kwargs)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 286, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
migration.instance_uuid, exc_info=True)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
six.reraise(self.type_, self.value, self.tb)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 269, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher return
function(self, context, *args, **kwargs)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 355, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
kwargs['instance'], e, sys.exc_info())
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
six.reraise(self.type_, self.value, self.tb)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 343, in
decorated_function
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher return
function(self, context, *args, **kwargs)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 4012, in
resize_instance
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
self.instance_events.clear_events_for_instance(instance)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/contextlib.py", line 35, in __exit__
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
self.gen.throw(type, value, traceback)
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6382, in
_error_out_instance_on_exception
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher raise
error.inner_exception
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
ResizeError: Resize error: not able to execute ssh command: Unexpected error
while running command.
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher Command:
ssh 20.20.20.3 mkdir -p
/var/lib/nova/instances/744d6341-023f-49cd-9d93-7bae7eb32653
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher Exit code:
255
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher Stdout: u''
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher Stderr:
u'Host key verification failed.\r\n'
2015-10-19 05:13:15.582 14325 TRACE oslo_messaging.rpc.dispatcher
When I checked the code, I found in /usr/lib/python2.7/dist-
packages/nova/virt/libvirt/driver.py file we checked the share storage
is true or not before migrating.
def _is_storage_shared_with(self, dest, inst_base):
# NOTE (rmk): There are two methods of determining whether we are
# on the same filesystem: the source and dest IP are the
# same, or we create a file on the dest system via SSH
# and check whether the source system can also see it.
shared_storage = (dest == self.get_host_ip_addr())
if not shared_storage:
tmp_file = uuid.uuid4().hex + '.tmp'
tmp_path = os.path.join(inst_base, tmp_file)
LOG.debug("Temp path is")
LOG.debug(tmp_path)
try:
utils.execute('ssh', dest, 'touch', tmp_path)
if os.path.exists(tmp_path):
shared_storage = True
os.unlink(tmp_path)
else:
utils.execute('ssh', dest, 'rm', tmp_path)
except Exception:
pass
return shared_storage
But in case of share storage between compute node “shared storage =
(dest == self.get_host_ip_addr())” always return false and also ssh
mkdir return false and Nova resize will fail.I think checking the
share storage using " shared_storage = (dest ==
self.get_host_ip_addr())" is not the right way. When I always return
true from _is_storage_shared_with function, the Nova resize works
fine.
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