After the system python was updated to 2.6.8 *some* mod_wsgi scripts
failed to import urandom from os. No, not those using virtualenv but
those *not* using virtualenv.
Traceback (most recent call last):
File "my.wsgi", line 33, in application
from os import urandom as _urandom
ImportError: cannot import name urandom
The application in "my.wsgi" is:
def application(environ, start_response):
status = '200 OK'
output = str(sys.path)
from os import urandom as _urandom
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)
return [output]
After barking up several wrong trees in the wrong forests (it worked
from the command lline, it worked if the application was using a
python in a virtualenv, it did not work with the system python and
system libraries) I finally checked the apache conf and discovered
that the *only* difference between the working and non-working
environments was that the _working_ one was:
WSGIDaemonProcess itworks threads=10 maximum-requests=10
while the _non-working_ one was:
WSGIDaemonProcess noworkee processes=2 maximum-requests=10
Changing the latter to the former and hey presto! It worked as if by magic.
Apache2 had been upgraded and restarted prior to the python upgrade
and several times after. The offending os.py finally seems to be gone
because both threads and processes work now, for both virtual hosts.
Now, I'm wondering how these two, threads and processes, differ, since
the processes one must still have been pointing to the wrong os.py for
much longer than the threads one. It feels like the only thing I
didn't do to fix this problem was to reboot the server. How can I make
sure after the next upgrade that this problem (lingering old versions)
does not reoccur?
HM
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