尝试通过Apache连接到数据库时，Django应用程序会挂起 [英] Django app hangs when attempting to connect to database via Apache

问题描述

我无法解决这个问题。我有一个在Ubuntu 14.04服务器上运行的Django应用程序（Apache 2.4和Python 3.4的mod_wsgi）。它通过pymssql连接到SQL Server。

I am having difficulty troubleshooting this issue. I have a Django app running on an Ubuntu 14.04 server (with Apache 2.4 and mod_wsgi for Python 3.4). It connects to SQL Server via pymssql.

在开发中，应用程序可以正常工作。我查询数据库，数据库返回预期的结果。

In development, the app works fine. I query the database, and the database returns the expected results.

然而，在生产（在Apache用户下），该脚本挂在数据库查询的确切位置是做的只要浏览器窗口打开，我的浏览器（Chrome或Firefox）会显示一个旋转轮。

In production (under the Apache user), however, the script hangs at the exact point that a database query is made. My browser (Chrome or Firefox) shows a spinning wheel that continues to spin as long as the browser window is open.

我的 apache2.conf 文件：

ServerName localhost
# WSGIDaemonProcess application
WSGIPythonPath /home/production_code/python3env/lib/python3.4/site-packages:/home/production_code/school
# WSGIProcessGroup application
WSGIScriptAlias / /home/production_code/school/school/wsgi.py
# Python virtualenv home
WSGIPythonHome /home/production_code/python3env
# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf

以下在我的 sites-enabled / 000-default.conf file： / p>

And the following in my sites-enabled/000-default.conf file:

<VirtualHost *:80>    
        ServerAdmin *****@school.edu
        ServerName  localhost
        DocumentRoot /var/www/html

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        Alias /static/ /home/production_code/school/static/

        <Directory /home/production_code/school/>
            Require all granted
        </Directory>
        <Directory /home/production_code/school/>
            <Files wsgi.py>
                Require all granted
            </Files>
        </Directory>
        <Directory /home/production_code/school/static>
            Require all granted
        </Directory>
</VirtualHost>

<在这种情况下，Apache错误日志和访问日志并不特别有用，因为对请求的响应不会被渲染。类似地，Django调试在这里也没有用。

Does anyone have any idea what might be causing this or how I might troubleshoot this? The Apache error logs and access logs are not particularly helpful in this situation, since a response to the request is never rendered. Similarly, Django debugging is also not useful here.

推荐答案

而不是：

# WSGIDaemonProcess application
WSGIPythonPath /home/production_code/python3env/lib/python3.4/site-packages:/home/production_code/school
# WSGIProcessGroup application

使用：

WSGIDaemonProcess application python-path=/home/production_code/python3env/lib/python3.4/site-packages:/home/production_code/school
WSGIProcessGroup application
WSGIApplicationGroup %{GLOBAL}

其中的一个关键部分是 WSGIApplicationGroup 指令，其设置为％{GLOBAL} 。

A key part of this is the WSGIApplicationGroup directive, with it being set to %{GLOBAL}.

这是为了避免错误的第三方扩展模块Python不能在子解释器中工作，并且可能会因死锁或崩溃而失败。

This is to get around faulty third party extension modules for Python that don't work in sub interpreters and which can fail with a dead lock or crash.

请参阅：

• https://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API

• https://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API

还建议您返回使用守护进程模式。使用嵌入式模式通常不是一个好主意。

It is also recommend you go back to using daemon mode. It is generally not a good idea to use embedded mode.

• http://blog.dscpl.com.au/2012/10/why-are-you- -embedded-mode-of.html

• http://blog.dscpl.com.au/2012/10/why-are-you-using-embedded-mode-of.html

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