uWSGI cannot find "application" using Flask and Virtualenv
Solution 1
unable to find "application" callable in file /var/www/coefficient/flask.py
is the key :)
Your app is defining an 'app' callable, so you have to instruct uWSGI to search for it, instead of 'application'.
You can use the option
callable: app
and it will works (this is explained in official Flask docs)
Solution 2
Alternatively, you can add module = flaskapp:app
to your ini.
Also, indeed, callable
is addressed in uwsgi-docs more clearly:
Flask exports its WSGI function (the one we called “application” at the beginning of this quickstart) as “app”, so we need to instruct uWSGI to use it:
uwsgi --wsgi-file myflaskapp.py --callable app
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Comments
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skyler over 1 year
Using uWSGI to serve a simple wsgi app, (a simple "Hello, World") my configuration works, but when I try to run a Flask app, I get this in uWSGI's error logs:
current working directory: /opt/python-env/coefficient/lib/python2.6/site-packages writing pidfile to /var/run/uwsgi.pid detected binary path: /opt/uwsgi/uwsgi setuid() to 497 your memory page size is 4096 bytes detected max file descriptor number: 1024 lock engine: pthread robust mutexes uwsgi socket 0 bound to TCP address 127.0.0.1:3031 fd 3 Python version: 2.6.6 (r266:84292, Jun 18 2012, 14:18:47) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] Set PythonHome to /opt/python-env/coefficient/ *** Python threads support is disabled. You can enable it with --enable-threads *** Python main interpreter initialized at 0xbed3b0 your server socket listen backlog is limited to 100 connections *** Operational MODE: single process *** added /opt/python-env/coefficient/lib/python2.6/site-packages/ to pythonpath. unable to find "application" callable in file /var/www/coefficient/flask.py unable to load app 0 (mountpoint='') (callable not found or import error) *** no app loaded. going in full dynamic mode *** *** uWSGI is running in multiple interpreter mode ***`
Note in particular this part of the log:
unable to find "application" callable in file /var/www/coefficient/flask.py
unable to load app 0 (mountpoint='') (callable not found or import error)
******no app loaded. going in full dynamic mode******
This is my Flask app:
from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello, World, from Flask!"
Before I added my Virtualenv's pythonpath to my configuration file, I was getting an ImportError for Flask. I solved this though, I believe (I'm not receiving errors about it anymore) and here is my complete configuration file:
uwsgi: #socket: /tmp/uwsgi.sock socket: 127.0.0.1:3031 daemonize: /var/log/uwsgi.log pidfile: /var/run/uwsgi.pid master: true vacuum: true #wsgi-file: /var/www/coefficient/coefficient.py wsgi-file: /var/www/coefficient/flask.py processes: 1 virtualenv: /opt/python-env/coefficient/ pythonpath: /opt/python-env/coefficient/lib/python2.6/site-packages
This is how I start uWSGI, from an rc script:
/opt/uwsgi/uwsgi --yaml /etc/uwsgi/conf.yaml --uid uwsgi
And if I try to view the Flask program in a browser, I get this:
**uWSGI Error** Python application not found
Any help is appreciated.
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skyler almost 12 yearsYou're correct: setting callable: app fixed it, and as you said, this in the Flask docs. Strangely, though, on another uWSGI install, using the same Python code, I did not have to specify callable: app; it just worked out of the box.
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Hamman Samuel over 7 yearsWhere do I set this value of
callable: app
? In flask.py?