Nginx – 504 gateway timeout on nginx + apache + mod_wsgi

I actually have my doubts that mod_wsgi is leaking. My guess is that your Django app is leaking. I have personally never found any evidence of mod_wsgi leaking memory and I run half a dozen mod_wsgi servers.

Django however is a different story. It's a huge project and in some modules there will be some memory leaked. But most (all?) of the known problems have been fixed in Django 1.1+.

So... I am guessing that something in your script is leaking. Are you running any specific code that could cause problems? What kind of test are you running exactly? A full site test with something like siege? Or a simple test on 1 page with ab?

Regardless, please show the code you are running and/or test if you still have memory leaks with something as simple as this:

def hello_world(request):
    return HttpResponse('Hello World!', mimetype='text/plain')

Right.. I think that a lot of the confusion is because of UFW, so I'll make the recommendation that you stop using it, and spend some time learning how iptables itself works. It's much more common to use iptables directly, instead of a wrapper around it.

In the meantime.

try:

allow from 127.0.0.0/8
allow in on lo0
allow out on lo0