Help with deploying on nginx

[Apple Mason]

I keep getting 502 Bad Gateway, and I'm not sure why. I followed the Nginx deployment recipe on the website, with the following changes:

/etc/uwsgi/web2py.xml: Used /var/www-data/web2py/ instead of /home/www-data/web2py/

nginx conf: server_name is my server ip (I don't have a domain name) instead of $hostname. I also changed the location to /web2py instead of root.

Here is my nginx conf:

server {
        listen 443 default_server ssl;
        server_name     xxx.xxx.xxx.xxx;
        ssl_certificate         /etc/nginx/ssl/server.crt;
        ssl_certificate_key     /etc/nginx/ssl/server.key;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;
        ssl_ciphers ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA;
        ssl_protocols SSLv3 TLSv1;
        keepalive_timeout    70;
        location /web2py {
            #uwsgi_pass      127.0.0.1:9001;
            uwsgi_pass      unix:///tmp/web2py.socket;
            include         uwsgi_params;
            uwsgi_param     UWSGI_SCHEME $scheme;
            uwsgi_param     SERVER_SOFTWARE    nginx/$nginx_version;
        }
}

I omitted http since I only want to test over https for now.

Restarted both uwsgi and nginx in that order. uwsgi seems to find web2py okay in their logs:

announcing my loyalty to the Emperor...
*** vassal web2py.xml is now loyal ***


When I access "https://<server ip>/web2py", I get the 502 error.

Nginx error.log says:

2013/08/29 18:10:08 [error] 9793#0: *4 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: xxx.xxx.xxx.xxx, request: "GET /web2py HTTP/1.1", upstream: "uwsgi://unix:///tmp/web2py.socket:", host: "xxx.xxx.xxx.xxx.

I'm running ubuntu 13.04 server, if that's any use.

[Niphlod]

what does uwsgi log show ?

[Apple Mason]

There's a lot of lines but here's a good portion of it:

*** Operational MODE: no-workers ***
spawned uWSGI master process (pid: 10483)
*** starting uWSGI Emperor ***
*** has_emperor mode detected (fd: 6) ***
[uWSGI] parsing config file web2py.xml
*** Starting uWSGI 1.2.3-debian (64bit) on [Thu Aug 29 18:25:59 2013] ***
compiled with version: 4.7.2 on 07 November 2012 03:49:52
detected number of CPU cores: 8
current working directory: /etc/uwsgi
detected binary path: /usr/bin/uwsgi-core
setgid() to 33
setuid() to 33
limiting address space of processes...
your process address space limit is 536870912 bytes (512 MB)
your memory page size is 4096 bytes
 *** WARNING: you have enabled harakiri without post buffering. Slow upload could be rejected on post-unbuffered webservers ***
detected max file descriptor number: 1024
lock engine: pthread robust mutexes
uwsgi socket 0 bound to UNIX address /tmp/web2py.socket fd 3
your server socket listen backlog is limited to 100 connections
*** Operational MODE: preforking ***
mounting wsgihandler:application on /
*** no app loaded. going in full dynamic mode ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 10485)
spawned uWSGI worker 1 (pid: 10486, cores: 1)
set cpu affinity for worker 1 to 0
spawned uWSGI worker 2 (pid: 10487, cores: 1)
spawned uWSGI worker 1 (pid: 10486, cores: 1)
set cpu affinity for worker 1 to 0
spawned uWSGI worker 2 (pid: 10487, cores: 1)
set cpu affinity for worker 2 to 1spawned uWSGI worker 3 (pid: 10488, cores: 1)
set cpu affinity for worker 3 to 2
spawned uWSGI worker 4 (pid: 10489, cores: 1)
*** Stats server enabled on /tmp/stats.socket fd: 16 ***
set cpu affinity for worker 4 to 3
-- unavailable modifier requested: 0 --

announcing my loyalty to the Emperor...
*** vassal web2py.xml is now loyal ***

-- unavailable modifier requested: 0 --

announcing my loyalty to the Emperor...
*** vassal web2py.xml is now loyal ***

-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --

announcing my loyalty to the Emperor...
*** vassal web2py.xml is now loyal ***

-- unavailable modifier requested: 0 --

announcing my loyalty to the Emperor...
*** vassal web2py.xml is now loyal ***

-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --
-- unavailable modifier requested: 0 --

[Niphlod]

http://stackoverflow.com/questions/10748108/nginx-uwsgi-unavailable-modifier-requested-0

its better to build uwsgi from source, so you dont' get caught in this crazy-organized apt packages.