The instance fault information is stored in the database and is tied to the instance when it fails, so as Jay points out it's used for diagnosing problems with the instance. It's not the CLI that's dumping the stack trace, it's the server code that's storing the stack trace in the InstanceFault table in the database, the nova show API is just show the db record. I don't have a problem with showing the stack trace.
** Changed in: nova
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1253629
Title:
don't print trace in cli command output
Status in OpenStack Compute (Nova):
Opinion
Bug description:
stack trace should be printed to log and not command output.
As admin a general or specific error would be better and easier to debug than
the entire trace mixed in with the command.
i tried booting an instance from a volume while i blocked the connectivity to
the nfs server.
once the instance failed booting on timeout and changed status to ERROR, I
ran nova show <instance UUID>.
the print shows stack trace
Steps to Reproduce:
1. create an nfs server
2. create a volume
3. block connectivity to the server using iptables: iptables -A OUTPUT -d
>Server> -j DROP
4. boot an instance from the volume: nova boot --flavor 2
--block_device_mapping=vda=<volume_uuid>::: <name>
5. run nova show <instance_UUID>
fault | {u'message': u'ClientException',
u'code': 500, u'details': u'The server has either erred or is incapable of
performing the requested ope
ration. (HTTP 500) (Request-ID: req-6cfa3ce9-312b-42f8-a3a2-846d87ae63bb) |
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 224, in
decorated_function
|
| | return function(self, context,
*args, **kwargs)
|
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1224, in
run_instance
|
| | do_run_instance()
|
| | File
"/usr/lib/python2.6/site-packages/nova/openstack/common/lockutils.py", line
242, in inner
|
| | retval = f(*args, **kwargs)
|
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 1223, in
do_run_instance
|
| | admin_password, is_first_time,
node, instance)
|
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 879, in
_run_instance
|
| |
self._set_instance_error_state(context, instance[\'uuid\'])
|
| | File
"/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
|
| | self.gen.next()
|
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 871, in
_run_instance
|
| | filter_properties, bdms)
|
| | File
"/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 911, in
_reschedule_or_reraise
|
| |
self._log_original_error(exc_info, instance_uuid)
|
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