On Wednesday, July 07, 2010 18:31:27 yannick wrote:
> Hello all,
>
> We are trying to deploy several TG2 applications behind a single same
> Apache server, with mod_wsgi. Using modwsgi_deploy worked pretty well,
> and the point we are at now is the following:
> - each application works fine on its own behind paster and/or apache
> w/ mod_wsgi
> - when accessing one application, then the other always produces the
> error shown below for the second application, whatever the order is
> done in. As long as we stay on one given app, there doesn't seem to be
> a problem. However as soon as we switch app, the problem arises and
> won't go away until we reload apache. Both apps are very similar in
> the way they use permissions and sqlite DBs, and present the same
> error after being loaded after the other.
>
> We didn't try to setup anything using virtualenv, just installed the
> TG2 apps directly on the system (system-wide). The error seems to
> indicate there is a conflict of columns in the DB but both apps are
> configured to use separate sqlite files so I don't see how this could
> be causing the problem.
> If you had any insight on what might be causing this very weird issue,
> I would be very very grateful.
IMHO your decision to not use venvs is a mistake, but that's unrelated to the
problem at hand.
What I think is the issue (Graham undoubtedly will have more insight into
this) is that your setup shares one python interpreter, instead of isolating
these.
There is ample documentation about that on the mod_wsgi-site, I think "Daemon
Processes" is the thing to look for.
For example, our VHost setup looks like this:
WSGIDaemonProcess www processes=10 threads=1 python-
path=/var/lib/ableton/live/lib/python2.5/site-packages
WSGIProcessGroup www
WSGIScriptAlias "/" "/var/lib/ableton/live/app.wsgi"
We have a second one, preview instead of www, which runs without a hitch.
Diez
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