python - 看到我尝试让 Flask 运行有什么问题了吗？ (mod_wsgi + 虚拟环境)

Question

我有一个运行全新安装的 Ubuntu 10.04 LTS 的 VPS。我正在尝试使用 Flask 微框架设置实时应用程序，但这给我带来了麻烦。我在尝试让它运行时做了笔记，下面是我的逐个游戏，以努力查明我哪里出错了。

安装

http://flask.pocoo.org/docs/installation/#installation

$ adduser myapp
$ sudo apt-get install python-setuptools
$ sudo easy_install pip
$ sudo pip install virtualenv

/home/myapp/
-- www/

$ sudo pip install virtualenv

/home/myapp/
-- www/
-- env/

$ . env/bin/activate
$ easy_install Flask

MOD_WSGI

http://flask.pocoo.org/docs/deploying/mod_wsgi/

$ sudo apt-get install apache2
$ sudo apt-get install libapache2-mod-wsgi

创建 WSGI 文件

$ nano /home/myapp/www/myapp.wsgi

--myapp.wsgi contents:--------------------------
activate_this = '/home/myapp/env/bin/activate_this.py'
execfile(activate_this, dict(__file__=activate_this))
from myapp import app as application

/home/myapp/
-- www/
     -- myapp.wsgi
-- env/

配置 Apache

$ nano /etc/apache2/sites-available/myapp.com

-----myapp.com file contents ---------------------
<VirtualHost *:80>
    ServerName myapp.com

    WSGIDaemonProcess myapp user=myapp group=myapp threads=5 python-path=/home/myapp/env/lib/python2.6/site-packages

    WSGIScriptAlias / /home/myapp/www/myapp.wsgi

    <Directory /home/myapp/www>
        WSGIProcessGroup myapp
        WSGIApplicationGroup %{GLOBAL}
        Order deny,allow
        Allow from all
    </Directory>
</VirtualHost>

启用我刚刚创建的虚拟主机文件

$ cd /etc/apache2/sites-enabled
$ ln -s ../sites-available/myapp.com

重启 Apache

$ /etc/init.d/apache2 restart

服务器给我一个 500 服务器错误页面。这是最新的错误日志:

mod_wsgi (pid=3514): Target WSGI script '/home/myapp/www/myapp.wsgi' cannot be loaded as Python module.
mod_wsgi (pid=3514): Exception occurred processing WSGI script '/home/myapp/www/myapp.wsgi'.
Traceback (most recent call last):
File "/home/myapp/www/myapp.wsgi", line 4, in <module>
from myapp import app as application
ImportError: No module named myapp

错误暗示这是非常明显的事情，但我完全迷路了。

Answer 1

显然，它找不到您的“myapp”包。您应该将它添加到您的 myapp.wsgi 文件中的路径中，如下所示:

import sys
sys.path.append(DIRECTORY_WHERE_YOUR_PACKAGE_IS_LOCATED)
from myapp import app

此外，如果 myapp 模块是一个包，您应该将 __init__.py 文件放入其目录中并将其清空。