For any type of error, first check if UWSGI is running fine ?
myusername@ubuntu-512:~$ sudo service uwsgi status
● uwsgi.service - uWSGI Emperor
Loaded: loaded (/etc/systemd/system/uwsgi.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2020-09-09 08:39:27 IST; 9min ago
Process: 1451 ExecStartPre=/bin/bash -c mkdir -p /run/uwsgi; chown myusername:www-data /run/uwsgi (code=exited, status=0/SUCCESS)
Main PID: 1530 (uwsgi)
Status: "The Emperor is governing 3 vassals"
Tasks: 7
Memory: 142.7M
CPU: 1.874s
CGroup: /system.slice/uwsgi.service
├─1530 /usr/local/bin/uwsgi --emperor /home/myusername/uwsgi/sites
├─1564 /usr/local/bin/uwsgi --ini website1.ini
├─1565 /usr/local/bin/uwsgi --ini website2.ini
├─1625 /usr/local/bin/uwsgi --ini website3.ini
├─2022 /usr/local/bin/uwsgi --ini website3.ini
├─2033 /usr/local/bin/uwsgi --ini website2.ini
└─2035 /usr/local/bin/uwsgi --ini website1.ini
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: Input to details english quote We-accept-the-love-we-think-we-deserve.
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: context: success
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: context: post_type quote
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: [pid: 2033|app: 0|req: 7/7] 114.119.146.195 () {40 vars in 768 bytes} [Wed Sep 9 03:14:29 2020] GET
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: [pid: 2035|app: 0|req: 1/1] 93.158.161.64 () {38 vars in 515 bytes} [Wed Sep 9 03:14:29 2020] GET /
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: announcing my loyalty to the Emperor...
Sep 09 08:44:29 ubuntu-512 uwsgi[1530]: Wed Sep 9 08:44:29 2020 - [emperor] vassal website1.ini is now loyal
Sep 09 08:46:03 ubuntu-512 uwsgi[1530]: [pid: 2035|app: 0|req: 2/2] 114.119.145.68 () {40 vars in 748 bytes} [Wed Sep 9 03:16:03 2020] GET
Sep 09 08:49:09 ubuntu-512 uwsgi[1530]: --- no python application found, check your startup logs for errors ---
Sep 09 08:49:09 ubuntu-512 uwsgi[1530]: [pid: 2022|app: -1|req: -1/5] 49.35.75.185 () {46 vars in 692 bytes} [Wed Sep 9 03:19:09 2020] GET
You might see any error here. In above log its showing error as --- no python application found, check your startup logs for errors ---. In this case, we need to check the wsgi.py file settings. Your wsgi file should look something like below. Please not the lines where I have added comment #added this
import os
import sys #added this
from django.core.wsgi import get_wsgi_application
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) #added this
sys.path.append(BASE_DIR) #added this
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'yourapp.settings')
application = get_wsgi_application()
Another way to trouble shoot is to check if .sock is created at following location
/run/uwsgi
If nothing gives any clue, try to see if you can run application manually using following command
sudo uwsgi --http 0.0.0.0:8400 --home /var/www/mywebsite1/venvft --chdir /var/www/mywebsite1/mysite07 --wsgi-file /var/www/mywebsite1/mysite07/wsgi.py
You might get different error here. e.g. some library is not installed. I got an error that model requests not found. I installed it in virtualenv as below
$virtualenv venvft
created virtual environment CPython3.6.4.final.0-64 in 453ms
creator CPython3Posix(dest=/var/www/yourapp/venvft, clear=False, global=False)
seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/home/user/.local/share/virtualenv/seed-app-data/v1.0.1)
activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
$source venvft/bin/activate
$pip install django
$pip install psycopg2
$pip install requests
deactivate
Another error I got is as below
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 72920 bytes (71 KB) for 1 cores
*** Operational MODE: single process ***
Traceback (most recent call last):
File "/var/www/website3/mysite07/wsgi.py", line 19, in
application = get_wsgi_application()
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
django.setup(set_prefix=False)
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/apps/registry.py", line 91, in populate
app_config = AppConfig.create(entry)
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/apps/config.py", line 116, in create
mod = import_module(mod_path)
File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 994, in _gcd_import
File "", line 971, in _find_and_load
File "", line 955, in _find_and_load_unlocked
File "", line 665, in _load_unlocked
File "", line 678, in exec_module
File "", line 219, in _call_with_frames_removed
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/contrib/auth/apps.py", line 8, in
from .checks import check_models_permissions, check_user_model
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/contrib/auth/checks.py", line 8, in
from .management import _get_builtin_permissions
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/contrib/auth/management/__init__.py", line 9, in
from django.contrib.contenttypes.management import create_contenttypes
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/contrib/contenttypes/management/__init__.py", line 2, in
from django.db import (
File "/var/www/website3/venvft/lib/python3.6/site-packages/django/db/migrations/__init__.py", line 1, in
from .migration import Migration, swappable_dependency # NOQA
ModuleNotFoundError: No module named 'django.db.migrations.migration'
unable to load app 0 (mountpoint='') (callable not found or import error)
*** no app loaded. going in full dynamic mode ***
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker 1 (and the only) (pid: 2699, cores: 1)
Here if you see in details, error is with the migrations. In above screen error is ModuleNotFoundError: No module named 'django.db.migrations.migration' common solution is to reinstall django. Here fortunately we are using virtualenv so I can remove and reinstall it without impacting other applications
$rm -rf venvft
$virtualenv venvft
created virtual environment CPython3.6.4.final.0-64 in 453ms
creator CPython3Posix(dest=/var/www/yourapp/venvft, clear=False, global=False)
seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/home/user/.local/share/virtualenv/seed-app-data/v1.0.1)
activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
$source venvft/bin/activate
$pip install django
$pip install psycopg2
pip install requests
deactivate
once its done I rerun the following
sudo uwsgi --http 0.0.0.0:8400 --home /var/www/mywebsite1/venvft --chdir /var/www/mywebsite1/mysite07 --wsgi-file /var/www/mywebsite1/mysite07/wsgi.py
Here again I got below error
sFatal Python error: Py_Initialize: Unable to get the locale encoding
ModuleNotFoundError: No module named 'encodings'
Current thread 0x00007f7b5b79d700 (most recent call first):
Aborted (core dumped)however when I tried to access my website, it was working properly. so for now, I decided to ignore the error