mod_wsgi python2.5 ubuntu 11.04问题

Question

我在使用ubuntu 11.04的amd64平台上有这样的cfg：

1. 从源代码构建python2.5到/usr/local/python2.5
2. 在/home/se7en/.virtualenvs/e-py25上的virtualenv

我将mod_wsgi.so重新编译为自定义python：

se7en@se7en-System-Product-Name:~$ ldd /usr/lib/apache2/modules/mod_wsgi.so
    linux-vdso.so.1 =>  (0x00007fff5af6c000)
    libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0x00007f7bed14b000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7becf2d000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7becd28000)
    libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007f7becb25000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7bec8a0000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7bec50b000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f7bed717000)

django.wsgi

#/usr/local/python2.5/bin/python
# -*- coding: utf-8 -*-
import os, sys
sys.stdout = sys.stderr


dn = os.path.dirname
PROJECT_ROOT = os.path.abspath( (dn(__file__)) )

#DJANGO_PROJECT_ROOT = os.path.join(PROJECT_ROOT, 'apps')
DJANGO_PROJECT_ROOT = PROJECT_ROOT

sys.path.insert(0, '/usr/local/python2.5/lib/python2.5/site-packages' )
sys.path.insert(0,'/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages')
sys.path.insert(0, DJANGO_PROJECT_ROOT )


os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'

print sys.version #return 2.5.5 (r255:77872, Apr 15 2011, 22:12:51
print sys.path

import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

apache站点配置：

<VirtualHost 192.168.1.3>

    ServerAdmin admin@wsgi.debianworld.ru
    ServerName wsgi.debianworld.ru


    ErrorLog    /home/se7en/workspace/lxchg/logs/error_log
    CustomLog   /home/se7en/workspace/lxchg/logs/access_log common



    WSGIScriptAlias / /home/se7en/workspace/lxchg/django.wsgi






    Alias "/media/" "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/contrib/admin/media/"
    <Location "/media/">
        SetHandler None
    </Location>

    Alias "/main_media/" "/home/se7en/workspace/lxchg/main_media/"
    <Location "/main_media/">
        SetHandler None
    </Location>
</VirtualHost>
WSGIPythonHome /home/se7en/.virtualenvs/e-py25
#WSGIPythonExecutable /usr/local/python2.5/bin/python

我的错误日志中出现错误：

[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3] mod_wsgi (pid=2955): Exception occurred processing WSGI script '/home/se7en/workspace/lxchg/django.wsgi'.
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3] Traceback (most recent call last):
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/core/handlers/wsgi.py", line 248, in __call__
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     response = self.get_response(request)
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/core/handlers/base.py", line 141, in get_response
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     return self.handle_uncaught_exception(request, resolver, sys.exc_info())
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/core/handlers/base.py", line 176, in handle_uncaught_exception
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     if resolver.urlconf_module is None:
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/core/urlresolvers.py", line 239, in _get_urlconf_module
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     self._urlconf_module = import_module(self.urlconf_name)
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/utils/importlib.py", line 35, in import_module
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     __import__(name)
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "C:\\workspace\\sdl\\lxchg\\urls.py", line 3, in <module>
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/views/generic/create_update.py", line 1, in <module>
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     from django.forms.models import ModelFormMetaclass, ModelForm
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/forms/__init__.py", line 17, in <module>
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     from models import *
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/forms/models.py", line 6, in <module>
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     from django.db import connections
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/db/__init__.py", line 77, in <module>
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     connection = connections[DEFAULT_DB_ALIAS]
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/db/utils.py", line 92, in __getitem__
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     backend = load_backend(db['ENGINE'])
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]   File "/home/se7en/.virtualenvs/e-py25/lib/python2.5/site-packages/django/db/utils.py", line 50, in load_backend
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     raise ImproperlyConfigured(error_msg)
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3] ImproperlyConfigured: 'django.db.backends.mysql' isn't an available database backend. 
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3] Try using django.db.backends.XXX, where XXX is one of:
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3]     'dummy', 'mysql', 'oracle', 'postgresql', 'postgresql_psycopg2', 'sqlite3'
[Wed Jun 22 13:45:54 2011] [error] [client 192.168.1.3] Error was: /home/se7en/.virtualenvs/e-py25/lib/python2.5/lib-dynload/array.so: undefined symbol: PyUnicodeUCS2_FromUnicode

然后我通过manage.py runserver启动项目，它可以工作，但是通过mod_wsgi却不能。 请帮忙）

Answer 1

Linux盒子上操作系统提供的Python版本针对UCS4 Unicode字符宽度进行了编译。 如果您是从源代码构建的，则除非您未明确说明，否则它将默认为UCS2。 结果是您的系统Python 2.5和/ usr / local下的本地版本期望Unicode字符具有不同的宽度，并且由于Unicode函数将UCS类型作为名称的一部分，所以当您使用为一个Python编译的对象与另一个Python一起编译时，您会收到Unicode函数的未定义错误。

之所以如此，正如其他答案所暗示的那样，是mod_wsgi.so实际上是在选择系统范围的UCS4 libpython2.5.so文件，而不是在/ usr / local / lib下的UCS2 Python。 尽管您可以设置LD_LIBRARY_PATH来使进程首先在/ usr / local / lib中查找，但这在Apache下是很痛苦的。 相反，您应该做的是再次从源代码重新构建mod_wsgi并执行以下操作：

make distclean
./configure --with-python=/usr/local/bin/python2.5
LD_RUN_PATH=/usr/local/lib make
sudo make install

通过在调用“ make”时在命令上将LD_RUN_PATH设置为环境变量，链接器会将/ usr / local / lib嵌入到直接到mod_wsgi.so的库搜索路径中。 这样，它将在运行时找到正确的libpython2.5.so，而无需设置LD_LIBRARY_PATH。 您可以通过在生成的mod_wsgi.so上运行“ ldd”来确认它是否工作，然后应从/ usr / local / lib中选择正确的库。

Answer 2

它正在针对系统Python加载。 您将需要使用$LD_LIBRARY_PATH将其指向VE Python。 有关详细信息，请参见ld.so(8)手册页。