Serving Pyramid App with UWSGI and NGINX - nginx

Question

I am new to NGINX, uWSGI AND Pyramid, and I am trying to serve a Pyramid app through uWSGI using nginx as a reverse proxy. I am really stuck at the moment and am hoping someone can make some suggestions for how to solve this. If you can explain a little what might be going on, that would be helpful too, as my understanding is very limited!
Currently, I am getting an `Internal Server Error' from uWSGI when I visit the reverse proxy URL. In the uWSGI error log, I am getting the error:
--- no python application found, check your startup logs for errors ---
The application works fine when I serve through uWSGI alone, launching with pserve. I can launch it from my virtual envelope as follows:
bin/pserve my-app/uwsgi.ini
But when I start nginx, and visit the proxy address, I get the Internal Server Error.
The settings I have in uwsgi.ini are as follows:
[app:main]
use = egg:myapp
pyramid.reload_templates = true
pyramid.debug_authorization = false
pyramid.debug_notfound = false
pyramid.debug_routematch = false
pyramid.default_locale_name = en
pyramid_debugtoolbar
[server:main]
use = egg:waitress#main
host = 0.0.0.0
port = 6543
[loggers]
keys = root, musiccircle
[handlers]
keys = console
[formatters]
keys = generic
[logger_root]
level = ERROR
handlers = console
[logger_musiccircle]
level = ERROR
handlers =
qualname = musiccircle
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatter_generic]
format = %(asctime)s %(levelname)-5.5s [%(name)s][%(threadName)s] %(message)s
[uwsgi]
socket = unix://home/usr/env/myapp/myapp.sock
master = true
processes = 48
cpu-affinity = 12
harakiri = 60
post-buffering = 8192
buffer-size = 65535
daemonize = ./uwsgi.log
pidfile = ./pid_5000.pid
listen = 32767
reload-on-as = 512
reload-on-rss = 192
limit-as = 1024
no-orphans = true
reload-mercy = 8
log-slow = true
virtualenv = /home/usr/env
And in the corresponding myapp.conf file in nginx, I have the following:
upstream myapp {
server 127.0.0.1:6543;
}
server {
listen 8080;
server_name myapp.local www.myapp.local;
location = /favicon.ico { access_log off; log_not_found off; }
location /static/ {
root /home/usr/env/myapp;
}
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
charset utf-8;
location / {
include uwsgi_params;
uwsgi_pass unix://home/usr/env/myapp/myapp.sock;
}
}
If you need to see anything else, please let me know. As you can see, Nginx is configured to serve at port 8080 (which it does), and the Pyramid app is being served by uWSGI to port 6543 (which it does).
Thanks in advance.

Answer 1

It seems Pyramid projects are intended to be installed (setup.py) and then run with a .ini configuration file with pserve. Pserve then passes in these config file details as **settings to your Pyramid app at run time.
This is different than, say, Flask which is not installed and generally has no configuration file. Such a Flask application can be run by uWSGI as needed, with all run-time configuration being handled by uWSGI or environment variables.
Since Pyramid usually needs a config file at run time, and relies on pserve to provide them when using a config file (ie production.ini), I think you'll have to run uwsgi --ini-paste production.ini (or if running with Pypy, uwsgi --pypy-paste production.ini) (thanks to #Sorrel)