I am trying to make my Flask application work on CentOS server. Basically the issue is that I have Python 2.6 installed in /usr/bin
which is system default and Python 3.4 installed in /usr/local/bin
. I would like to use Python 3.4 virtualenv or at least Python 3.4 interpreter for mod_wsgi to run my application.
I have created virtualenv in ~/virtualenvs/flask
.
I have this WSGI script:
import os
import sys
from logging import Formatter, FileHandler
APP_HOME = r"/home/fenikso/Album"
activate_this = os.path.join("/home/fenikso/virtualenvs/flask/bin/activate_this.py")
execfile(activate_this, dict(__file__=activate_this))
sys.path.insert(0, APP_HOME)
os.chdir(APP_HOME)
from app import app
handler = FileHandler("app.log")
handler.setFormatter(Formatter("[%(asctime)s | %(levelname)s] %(message)s"))
app.logger.addHandler(handler)
application = app
And following config in Apache:
<VirtualHost *:80>
ServerName album2.site.cz
Alias /static "/home/fenikso/Album/static"
Alias /photos "/home/fenikso/Album/photos"
Alias /thumbs "/home/fenikso/Album/thumbs"
WSGIScriptAlias / "/home/fenikso/Album/wsgi.py"
<Directory "/home/fenikso/Album">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/static">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/photos">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/thumbs">
AllowOverride None
Allow from all
</Directory>
</VirtualHost>
However, when trying to run the application, I get an error:
Apache/2.2.15 (Unix) DAV/2 mod_wsgi/3.2 Python/2.6.6 mod_fcgid/2.3.7 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.1e-fips SVN/1.6.11 mod_perl/2.0.4 Perl/v5.10.1 configured -- resuming normal operations
mod_wsgi (pid=14627): Target WSGI script '/home/fenikso/Album/wsgi.py' cannot be loaded as Python module.
mod_wsgi (pid=14627): Exception occurred processing WSGI script '/home/fenikso/Album/wsgi.py'.
Traceback (most recent call last):
File "/home/fenikso/Album/wsgi.py", line 15, in <module>
from app import app
File "/home/fenikso/Album/app.py", line 1, in <module>
from flask import Flask
ImportError: No module named flask
I have noticed that either Python 2.6 is being ran and my virtualenv is not activated. What would be the proper way to get this working and still have the Python 2.6 as a system default?
By default, that will be the version of python that is used for any new environment you create. However, you can specify any version of python installed on your computer to use inside a new environment with the -p flag : $ virtualenv -p python3. 2 my_env Running virtualenv with interpreter /usr/local/bin/python3.
Virtualenv is installed by default on DreamHost servers for Python 2, so you do not need to install it to run it. However, it's recommended you install a custom version of Python as doing so also installs pip.
Creating a Python Virtual Environment virtualenv supports older Python versions and needs to be installed using the pip command. In contrast, venv is only used with Python 3.3 or higher and is included in the Python standard library, requiring no installation.
Always use a Virtual Environment You are in control of which packages versions are installed and when they are upgraded. You can have as many venvs as you want.
You have to add the following line in your apache.conf in order to give the right executable and the path to the virtualenv.
WSGIPythonHome /usr/local/bin
WSGIPythonPath /home/fenikso/virtualenv/lib/python3.4/site-packages
You will find all the options of these two command in the mod_wsgi documentation
Be aware that you must have the version of mod_wsgi compatible with the python executable. In your case, you probably have to install mod_wsgi3.4 and configure apache to use it instead of the standart mod_wsgi module.
The whole configuration file should be :
WSGIPythonHome "/usr/local/bin"
WSGIPythonPath "/home/fenikso/virtualenv/lib/python3.4/site-packages"
<VirtualHost *:80>
ServerName album2.site.cz
Alias /static "/home/fenikso/Album/static"
Alias /photos "/home/fenikso/Album/photos"
Alias /thumbs "/home/fenikso/Album/thumbs"
WSGIScriptAlias / "/home/fenikso/Album/wsgi.py"
<Directory "/home/fenikso/Album">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/static">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/photos">
AllowOverride None
Allow from all
</Directory>
<Directory "/home/fenikso/Album/thumbs">
AllowOverride None
Allow from all
</Directory>
</VirtualHost>
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