Nailgun doesn't write a traceback in the logfile in case of 500 code

[Pavel Chechetin]

There is no traceback in the logfile.
The absence of traceback complicates troubleshooting.

It turns out that fuel2 command with --debug option writes a traceback to the console output but there is no traceback in the logfile anyway.

Steps to reproduce:
  1. Put "raise Exception" somewhere in nailgun/extensions/cluster_upgrade/upgrade.py
  2. Restart nailgun
  3. Execute: octane upgrade-env 1

Actual behavior:
  1. There is no traceback in the logfile.

Expected behavior:
  1. There is a traceback in the logfile.

[Oleg S. Gelbukh (gelbuhos)]

To get tracebacks in log files in Nailgun, you need to change /etc/nailgun/settings.yaml by changing DEVELOPMENT parameter to 'true' and restart Nailgun service. By default, Nailgun doesn't log traces.

[Oleg S. Gelbukh (gelbuhos)]

I believe this should be changed to Invalid, since it's not a bug but more a misconfiguration.

[Pavel Chechetin (paulche)]

As Oleg Gelbukh said above the core issue is Nailgun doesn't write tracebacks to the logfile unless DEVELOPMENT parameter is set to 'true'.
It doesn't make any sense. I don't see any pros of this decision. But I can see many cons. It definitely complicates troubleshooting to say the least.

Also, it has nothing to do with octane (it's just has been found when octane was used).

[Alexander Saprykin (cutwater)]

Need more information about cases when this issue appears.
I checked it on fuel 9.0 build 299.

# grep DEVELOPMENT /etc/nailgun/settings.yaml
DEVELOPMENT: false

I added raise Exception to OpenstackConfigExecuteHandler.

# fuel2 openstack-config execute -e 1
500 Server Error: Internal Server Error for url: http://10.20.0.2:8000/api/v1/openstack-config/execute/ ()

In /var/log/nailgun/app.log

2016-05-13 10:19:40.547 ERROR [7f4b13a14880] (base) Unexpected exception occured
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nailgun/api/v1/handlers/base.py", line 285, in content_json
    resp = func(cls, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/nailgun/api/v1/handlers/openstack_config.py", line 119, in PUT
    raise Exception
Exception

It looks like expected, exception is logged. Did I miss something?

[Dmitry Klenov (dklenov)]

No updates for more than a month. Closing.