Django populate() 在具有不同域的多语言设置中不可重入

Question

我运行一个 Django==1.10.4 网站，有 4 种不同的语言。他们每个人都有自己的领域。其中只有 2 或 3 个同时工作。一个或多个失败并出现此错误：

这是我终止我的 wsgi 进程并第一次访问该页面后出现的错误：

mod_wsgi (pid=8416): Target WSGI script '/var/www/user324/htdocs/ukmypagecom/app.wsgi' cannot be loaded as Python module.
 mod_wsgi (pid=8416): Exception occurred processing WSGI script '/var/www/user324/htdocs/ukmypagecom/app.wsgi'.
 Traceback (most recent call last):
   File "/var/www/user324/htdocs/ukmypagecom/app.wsgi", line 11, in <module>
     application = django.core.wsgi.get_wsgi_application()
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
     django.setup(set_prefix=False)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
     apps.populate(settings.INSTALLED_APPS)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
     app_config.import_models(all_models)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/apps/config.py", line 199, in import_models
     self.models_module = import_module(models_module_name)
   File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
     __import__(name)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/contrib/auth/models.py", line 4, in <module>
     from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/contrib/auth/base_user.py", line 52, in <module>
     class AbstractBaseUser(models.Model):
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/models/base.py", line 119, in __new__
     new_class.add_to_class('_meta', Options(meta, app_label))
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/models/base.py", line 316, in add_to_class
     value.contribute_to_class(cls, name)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/models/options.py", line 214, in contribute_to_class
     self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/__init__.py", line 33, in __getattr__
     return getattr(connections[DEFAULT_DB_ALIAS], item)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/utils.py", line 211, in __getitem__
     backend = load_backend(db['ENGINE'])
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/db/utils.py", line 134, in load_backend
     raise ImproperlyConfigured(error_msg)
 ImproperlyConfigured: 'django.contrib.gis.db.backends.mysql' isn't an available database backend.
 Try using 'django.db.backends.XXX', where XXX is one of:
     'mysql', 'oracle', 'postgresql', 'sqlite3'
 Error was: cannot import name GEOSException

每次重新加载页面后，我只收到此错误：

 mod_wsgi (pid=8416): Target WSGI script '/var/www/user324/htdocs/ukmypagecom/app.wsgi' cannot be loaded as Python module.
 mod_wsgi (pid=8416): Exception occurred processing WSGI script '/var/www/user324/htdocs/ukmypagecom/app.wsgi'.
 Traceback (most recent call last):
   File "/var/www/user324/htdocs/ukmypagecom/app.wsgi", line 11, in <module>
     application = django.core.wsgi.get_wsgi_application()
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
     django.setup(set_prefix=False)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
     apps.populate(settings.INSTALLED_APPS)
   File "/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages/django/apps/registry.py", line 78, in populate
     raise RuntimeError("populate() isn't reentrant")
 RuntimeError: populate() isn't reentrant

这是我的设置文件查找每个域的方式。

#settings_en.py
from base_settings import *

ALLOWED_HOSTS = ['127.0.0.1', '.example.com' ]
LANGUAGE_CODE = 'en-GB'
ROOT_URLCONF = 'myproject.base_urls'
SITE_ID = 18

#settings_pl.py
from base_settings import *

ALLOWED_HOSTS = ['127.0.0.1', '.example.com' ]
LANGUAGE_CODE = 'pl-PL'
ROOT_URLCONF = 'myproject.base_urls'
SITE_ID = 19

#settings_xx.py
...

这就是我的 app.wsgi 每个域的样子

#english version

#!/usr/bin/python
import sys, os

sys.path.insert(0, '/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages') #virtualenv
sys.path.insert(0, '/var/www/user324/priv/mysourcecode') #sourcecode

os.environ['DJANGO_SETTINGS_MODULE'] = 'myproject.settings_en'

import django.core.wsgi
application = django.core.wsgi.get_wsgi_application()


#polish version
#!/usr/bin/python
import sys, os

sys.path.insert(0, '/var/www/user324/priv/venv/myvenv/lib/python2.7/site-packages')
sys.path.insert(0, '/var/www/user324/priv/mysourcecode')

os.environ['DJANGO_SETTINGS_MODULE'] = 'myproject.settings_pl'

import django.core.wsgi
application = django.core.wsgi.get_wsgi_application()

知道这里出了什么问题吗？

在我重新启动我的 wsgi 进程后，一些域正在工作，一些域不工作。每个域都在访问相同的源代码和相同的数据库。所以我认为源代码没有问题，因为直接运行的那些站点没有任何问题。

Answer 1

这看起来不像是 Django 问题，而是 mod_wsgi 配置错误 -- 看起来您的应用程序可能运行在同一个解释器中并且存在冲突。

您的Apache/mod_wsgi配置如何？特别感兴趣的是 daemon mode should be turned on and the daemon separate for each site. (See that directive's docs.)

此外，我建议考虑使用 Apache/mod_wsgi 之外的其他东西来为您的应用程序提供服务——Nginx + uWSGI 是我选择的武器。

Django populate() 在具有不同域的多语言设置中不可重入

Django populate() isn't reentrant on multilanguage setup with different domains

django

multilingual