I took over development of a site recently and was having trouble with code 
being imported/run from all over the place, seemingly at random. On the 
dev-server, multiple copies of the same site was running, some 
with WSGIDaemonProcess (mod_wsgi 3.3), others embedded. Having them all 
use WSGIDaemonProcess didn't solve the problem (and yes, there 
were WSGIProcessGroup in the same file).

Turns out: 

The staging copy runs two daemon-processes, one single-threaded 
(processes=1 threads=1 set explicitly) and one not. One <Location> was set 
to use the single threaded group, several, but not all, other locations 
were set to use the multithreaded group. I moved the multithreaded 
WSGIProcessGroup to the level of the virtual host, and kept the 
singlethreaded WSGIProcessGroup for the one spot it was needed. No more 
clashes, code was fetched from the right place. However... The <location> 
that needs to be single threaded isn't, judging by the errors I get. 

If I 
read 
https://modwsgi.readthedocs.org/en/latest/configuration-directives/WSGIProcessGroup.html
 
correctly, a WSGIProcessGroup set inside a <location> overrides the 
WSGIProcessGroup 
set outside. Is this correct, and if so, why isn't the one location with an 
override actually overidden?

Secondly, if:

WSGIDaemonGroup foo
WSGIDaemonGroup bar
WSGIProcessGroup foo

<location /xux>
WSGIProcessGroup bar
</location>

<location /gurba>
..
</location>

<location /meepmeep>
# Non-python stuff
</location>

properly separates the processes while:

WSGIDaemonGroup foo
WSGIDaemonGroup bar

<location /xux>
WSGIProcessGroup bar
</location>

<location /gurba>
WSGIProcessGroup foo
</location>

<location /meepmeep>
# Non-python stuff
</location>

doesn't, shouldn't that be documented?

Or am I barking up the wrong tree here?


K

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