Django module not found

[aquagarced]

I went looking through the logs after successfully installing the flake because I kept getting an internal server error while attempting to connect to the web gui, and I found this in the logs for the uwsgi systemd service:

Aug 23 15:01:25 nixos uwsgi[1375]: Traceback (most recent call last):
Aug 23 15:01:25 nixos uwsgi[1375]:   File "/var/lib/openstack_dashboard/wsgi.py", line 21, in <module>
Aug 23 15:01:25 nixos uwsgi[1372]: Traceback (most recent call last):
Aug 23 15:01:25 nixos uwsgi[1372]:   File "/var/lib/openstack_dashboard/wsgi.py", line 21, in <module>
Aug 23 15:01:25 nixos uwsgi[1380]: Traceback (most recent call last):
Aug 23 15:01:25 nixos uwsgi[1380]:   File "/var/lib/openstack_dashboard/wsgi.py", line 21, in <module>
Aug 23 15:01:25 nixos uwsgi[1375]:     from django.core.wsgi import get_wsgi_application
Aug 23 15:01:25 nixos uwsgi[1375]: ModuleNotFoundError: No module named 'django'
Aug 23 15:01:25 nixos uwsgi[1375]: unable to load app 0 (mountpoint='') (callable not found or import error)
Aug 23 15:01:25 nixos uwsgi[1372]:     from django.core.wsgi import get_wsgi_application
Aug 23 15:01:25 nixos uwsgi[1375]: *** no app loaded. going in full dynamic mode ***
Aug 23 15:01:25 nixos uwsgi[1372]: ModuleNotFoundError: No module named 'django'
Aug 23 15:01:25 nixos uwsgi[1372]: unable to load app 0 (mountpoint='') (callable not found or import error)
Aug 23 15:01:25 nixos uwsgi[1380]:     from django.core.wsgi import get_wsgi_application
Aug 23 15:01:25 nixos uwsgi[1372]: *** no app loaded. going in full dynamic mode ***
Aug 23 15:01:25 nixos uwsgi[1380]: ModuleNotFoundError: No module named 'django'
Aug 23 15:01:25 nixos uwsgi[1380]: unable to load app 0 (mountpoint='') (callable not found or import error)
Aug 23 15:01:25 nixos uwsgi[1380]: *** no app loaded. going in full dynamic mode ***

I would normally assume I did something wrong however I get no errors when rebuilding this? Is this from my own error in setting this up or is something not quite right with the flake if you wish to install it into an exisiting system?

[aquagarced]

Small update, if I add pkgs.python312Packages.django to the python packages in horizon.nix I get a new error, where it now cannot find horizon:

Aug 23 23:01:13 nixos uwsgi[1367]: Traceback (most recent call last):
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/var/lib/openstack_dashboard/wsgi.py", line 29, in <module>
Aug 23 23:01:13 nixos uwsgi[1367]:     application = get_wsgi_application()
Aug 23 23:01:13 nixos uwsgi[1367]:                   ^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]: Traceback (most recent call last):
Aug 23 23:01:13 nixos uwsgi[1372]: Traceback (most recent call last):
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/var/lib/openstack_dashboard/wsgi.py", line 29, in <module>
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/var/lib/openstack_dashboard/wsgi.py", line 29, in <module>
Aug 23 23:01:13 nixos uwsgi[1367]:     django.setup(set_prefix=False)
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/__init__.py", line 19, in setup
Aug 23 23:01:13 nixos uwsgi[1372]:     application = get_wsgi_application()
Aug 23 23:01:13 nixos uwsgi[1375]:     application = get_wsgi_application()
Aug 23 23:01:13 nixos uwsgi[1372]:                   ^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:                   ^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
Aug 23 23:01:13 nixos uwsgi[1367]:     configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
Aug 23 23:01:13 nixos uwsgi[1372]:     django.setup(set_prefix=False)
Aug 23 23:01:13 nixos uwsgi[1367]:                       ^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:     django.setup(set_prefix=False)
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 102, in __getattr__
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/__init__.py", line 19, in setup
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/__init__.py", line 19, in setup
Aug 23 23:01:13 nixos uwsgi[1372]:     configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
Aug 23 23:01:13 nixos uwsgi[1375]:     configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
Aug 23 23:01:13 nixos uwsgi[1367]:     self._setup(name)
Aug 23 23:01:13 nixos uwsgi[1372]:                       ^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:                       ^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 102, in __getattr__
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 89, in _setup
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 102, in __getattr__
Aug 23 23:01:13 nixos uwsgi[1367]:     self._wrapped = Settings(settings_module)
Aug 23 23:01:13 nixos uwsgi[1372]:     self._setup(name)
Aug 23 23:01:13 nixos uwsgi[1375]:     self._setup(name)
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 89, in _setup
Aug 23 23:01:13 nixos uwsgi[1367]:                     ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 89, in _setup
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 217, in __init__
Aug 23 23:01:13 nixos uwsgi[1372]:     self._wrapped = Settings(settings_module)
Aug 23 23:01:13 nixos uwsgi[1375]:     self._wrapped = Settings(settings_module)
Aug 23 23:01:13 nixos uwsgi[1372]:                     ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:                     ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 217, in __init__
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/site-packages/django/conf/__init__.py", line 217, in __init__
Aug 23 23:01:13 nixos uwsgi[1367]:     mod = importlib.import_module(self.SETTINGS_MODULE)
Aug 23 23:01:13 nixos uwsgi[1372]:     mod = importlib.import_module(self.SETTINGS_MODULE)
Aug 23 23:01:13 nixos uwsgi[1375]:     mod = importlib.import_module(self.SETTINGS_MODULE)
Aug 23 23:01:13 nixos uwsgi[1367]:           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/importlib/__init__.py", line 90, in import_module
Aug 23 23:01:13 nixos uwsgi[1372]:           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1375]:           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/importlib/__init__.py", line 90, in import_module
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/nix/store/c9743zy6kv2ws7948rydyx728zrvl97j-python3-3.12.11-env/lib/python3.12/importlib/__init__.py", line 90, in import_module
Aug 23 23:01:13 nixos uwsgi[1372]:     return _bootstrap._gcd_import(name[level:], package, level)
Aug 23 23:01:13 nixos uwsgi[1367]:     return _bootstrap._gcd_import(name[level:], package, level)
Aug 23 23:01:13 nixos uwsgi[1375]:     return _bootstrap._gcd_import(name[level:], package, level)
Aug 23 23:01:13 nixos uwsgi[1372]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
Aug 23 23:01:13 nixos uwsgi[1375]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap_external>", line 999, in exec_module
Aug 23 23:01:13 nixos uwsgi[1372]:   File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
Aug 23 23:01:13 nixos uwsgi[1372]:   File "/var/lib/openstack_dashboard/settings.py", line 27, in <module>
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap_external>", line 999, in exec_module
Aug 23 23:01:13 nixos uwsgi[1375]:   File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
Aug 23 23:01:13 nixos uwsgi[1375]:   File "/var/lib/openstack_dashboard/settings.py", line 27, in <module>
Aug 23 23:01:13 nixos uwsgi[1367]:            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap_external>", line 999, in exec_module
Aug 23 23:01:13 nixos uwsgi[1372]:     from horizon.utils.escape import monkeypatch_escape
Aug 23 23:01:13 nixos uwsgi[1367]:   File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
Aug 23 23:01:13 nixos uwsgi[1367]:   File "/var/lib/openstack_dashboard/settings.py", line 27, in <module>
Aug 23 23:01:13 nixos uwsgi[1375]:     from horizon.utils.escape import monkeypatch_escape
Aug 23 23:01:13 nixos uwsgi[1372]: ModuleNotFoundError: No module named 'horizon'
Aug 23 23:01:13 nixos uwsgi[1372]: unable to load app 0 (mountpoint='') (callable not found or import error)
Aug 23 23:01:13 nixos uwsgi[1375]: ModuleNotFoundError: No module named 'horizon'
Aug 23 23:01:13 nixos uwsgi[1375]: unable to load app 0 (mountpoint='') (callable not found or import error)
Aug 23 23:01:13 nixos uwsgi[1372]: *** no app loaded. going in full dynamic mode ***
Aug 23 23:01:13 nixos uwsgi[1375]: *** no app loaded. going in full dynamic mode ***
Aug 23 23:01:13 nixos uwsgi[1367]:     from horizon.utils.escape import monkeypatch_escape
Aug 23 23:01:13 nixos uwsgi[1367]: ModuleNotFoundError: No module named 'horizon'
Aug 23 23:01:13 nixos uwsgi[1367]: unable to load app 0 (mountpoint='') (callable not found or import error)

Looking at the code its not immediately obvious why the horizon import wouldn't work properly, but at the very least it does seem like something is amiss with the python packages in horizon.nix? I'll keep trying to find a fix when I can in the mean time

[hertrste]

The Horizon support is not as good tested as the other services, as it wasn't a hard requirement for us.

Your error looks like some versioning problem. Currently, we recommend using the nixpkgs pinned in the flake.{nix,lock}. There are known problems when upgrading to nixpkgs 25.05 (see here).

Have you tested Horizon in the NixOS tests that are provided in the repo?

[aquagarced]

I have not, I suppose I kind of just assumed that tests would be optional to install. While the system as a whole uses nixpkgs 25.05 I didn't change the version pinned in the flake.nix for openstack. Does the whole system have to use older nixpkgs? I'll do some more testing when I get back from work today

[hertrste]

Does the whole system have to use older nixpkgs?

I at least have observed problems when the nixpkgs of the system were different from openstack. This might came because of some generic unpinned packages we simple turn on in the nixos modules (ovsdb, rabbitmq, ...). But I haven't debugged why this was happening.

[aquagarced]

I can confirm that downgrading the system to 24.11 fixes the problem with the django server, however I am still unable to include the testing modules as part of the flake building my desktop. If I do I get:

error:
       … while calling the 'seq' builtin
         at /nix/store/lc5bxq4vsgpjjc7i9phdm8s0bxjz0drm-source/lib/modules.nix:360:18:
          359|         options = checked options;
          360|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          361|         _module = checked (config._module);

       … while calling the 'throw' builtin
         at /nix/store/lc5bxq4vsgpjjc7i9phdm8s0bxjz0drm-source/lib/modules.nix:331:13:
          330|           else
          331|             throw baseMsg
             |             ^
          332|         else

       error: The option `virtualisation.cores' does not exist. Definition values:
       - In `/nix/store/lc5bxq4vsgpjjc7i9phdm8s0bxjz0drm-source/flake.nix': 4

If I had to guess it may have something to do with this?: NixOS/nixpkgs#196755 But I'm not certain, I haven't gotten the chance to experiment yet

It would probably also be useful to include in the readme that the whole system must use 24.11

[hertrste]

You can probably only use the virtualisation config options if you evaluate the nixos config for some VM target. The testing modules really are not suited for usage on a desktop I guess, as they also specify things like services.getty.autologinUser = "root"; which you probably do not want.

I think what you can do is:

• not include the testing modules
• specify the extraHosts to let controller point to the right IP
• If your desktop also serves as a compute node, include the compute nixos modules and
  • provide a custom nova config that sets the my_ip value correctly

[github-actions]

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