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Asked: 2026-06-17T10:09:28+00:00

I’m looking for a working uwsgi configuration for Django application on Heroku. Currently I

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I’m looking for a working uwsgi configuration for Django application on Heroku.

Currently I have 

uWSGI==1.4.4

in requirements.txt and:

# this is in a single line:
web: uwsgi --http-socket=$PORT --home=$HOME 
           --module="myapp.wsgi:application"
           --master --vacuum --processes=1 --plugins=python 
           --virtualenv="/app/.heroku/python/"

in Procfile. But this fails with:

2013-01-15T11:48:17+00:00 app[web.1]: open("./python_plugin.so"): No such file or directory [core/utils.c line 4733]
2013-01-15T11:48:17+00:00 app[web.1]: machine: x86_64
2013-01-15T11:48:17+00:00 app[web.1]: !!! UNABLE to load uWSGI plugin: ./python_plugin.so: cannot open shared object file: No such file or directory !!!
2013-01-15T11:48:17+00:00 app[web.1]: nodename: 71650ed5-006c-4395-8be5-276408f42efb
2013-01-15T11:48:17+00:00 app[web.1]: os: Linux-2.6.32-350-ec2 #57-Ubuntu SMP Thu Nov 15 15:59:03 UTC 2012
2013-01-15T11:48:17+00:00 app[web.1]: *** Starting uWSGI 1.4.4 (64bit) on [Tue Jan 15 11:48:17 2013] ***
2013-01-15T11:48:17+00:00 app[web.1]:
lock engine: pthread robust mutexes
2013-01-15T11:48:17+00:00 app[web.1]: detected max file descriptor number: 10000
2013-01-15T11:48:17+00:00 app[web.1]: current working directory: /app
2013-01-15T11:48:17+00:00 app[web.1]: detected binary path: /app/.heroku/python/bin/uwsgi
2013-01-15T11:48:17+00:00 app[web.1]: your processes number limit is 256
2013-01-15T11:48:17+00:00 app[web.1]: detected number of CPU cores: 4
2013-01-15T11:48:17+00:00 app[web.1]: uwsgi socket 0 bound to UNIX address 25699 fd 3
2013-01-15T11:48:17+00:00 app[web.1]: clock source: unix
2013-01-15T11:48:17+00:00 app[web.1]: *** Operational MODE: single process ***
2013-01-15T11:48:17+00:00 app[web.1]: compiled with version: 4.4.3 on 15 January 2013 11:11:38
2013-01-15T11:48:17+00:00 app[web.1]: Python version: 2.7.2 (default, Oct 31 2011, 16:22:04)  [GCC 4.4.3]
2013-01-15T11:48:17+00:00 app[web.1]: Set PythonHome to /app/.heroku/python/
2013-01-15T11:48:17+00:00 app[web.1]: your memory page size is 4096 bytes
2013-01-15T11:48:17+00:00 app[web.1]: Python main interpreter initialized at 0x123dd80
2013-01-15T11:48:17+00:00 app[web.1]: *** Python threads support is disabled. You can enable it with --enable-threads ***
2013-01-15T11:48:17+00:00 app[web.1]: your server socket listen backlog is limited to 100 connections
2013-01-15T11:48:17+00:00 app[web.1]: mapped 144784 bytes (141 KB) for 1 cores
2013-01-15T11:48:17+00:00 app[web.1]: Traceback (most recent call last):
2013-01-15T11:48:17+00:00 app[web.1]:   File "./myapp/wsgi.py", line 23, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 8, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:     from django.core.wsgi import get_wsgi_application
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/core/wsgi.py", line 1, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:     from django import http
2013-01-15T11:48:17+00:00 app[web.1]:     from django.core.handlers.wsgi import WSGIHandler
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/http/__init__.py", line 116, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:     from django.utils.crypto import constant_time_compare, salted_hmac
2013-01-15T11:48:17+00:00 app[web.1]:     from django.core import signing
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/utils/crypto.py", line 13, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/django/core/signing.py", line 42, in <module>
2013-01-15T11:48:17+00:00 app[web.1]:     from os import urandom as _urandom
2013-01-15T11:48:17+00:00 app[web.1]: ImportError: cannot import name urandom
2013-01-15T11:48:17+00:00 app[web.1]:     import random
2013-01-15T11:48:17+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/random.py", line 47, in <module>
2013-01-15T11:48:17+00:00 app[web.1]: *** no app loaded. going in full dynamic mode ***
2013-01-15T11:48:17+00:00 app[web.1]: unable to load app 0 (mountpoint='') (callable not found or import error)
2013-01-15T11:48:17+00:00 app[web.1]: spawned uWSGI master process (pid: 2)
2013-01-15T11:48:17+00:00 app[web.1]: *** uWSGI is running in multiple interpreter mode ***
2013-01-15T11:48:17+00:00 app[web.1]: spawned uWSGI worker 1 (pid: 3, cores: 1)
2013-01-15T11:49:17+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2013-01-15T11:49:17+00:00 heroku[web.1]: Stopping process with SIGKILL
2013-01-15T11:49:18+00:00 heroku[web.1]: Process exited with status 137
2013-01-15T11:49:18+00:00 heroku[web.1]: State changed from starting to crashed

I guess the second error (ImportError: cannot import name urandom) is likely a result of the first error (open("./python_plugin.so"): No such file or directory)

The application works fine with default Django devel HTTP server.

Any ideas how to fix this? Pointers to working configs are very welcome.

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1 Answer

  1. Editorial Team

    when you install uwsgi with pip the python (and the gevent) plugin is built in by default, so you can remove the –plugin option. –vacuum is needed only for unix sockets (you use tcp sockets on heroku). –home and –virtualenv are synonims (i suggest you to use –virtualenv as it is more meaningful). Finally regarding the urandom problem, check here: https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/989856

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