Paster contains the WSGI server originally incorporated within CherryPy (see http://pythonpaste.org/script/module-paste.script.wsgiserver.html). Funnily enough, this is a pretty hot contender amongst other Python WSGI webservers (see http://nichol.as/benchmark-of-python-web-servers) : Maybe not the best, but because of its ease of set-up (working out-of-the-box for Pyramid and Pylons) it is extremely compelling.

Combining it with NGINX makes for a very easy-to-configure, fast and scalable set-up. Here goes…

Paste reads its configuration from the .INI file :

ini
[server:main]
host = /tmp/SITENAME-python.sock
use = egg:PasteScript#cherrypy
numthreads = 10
timeout = 180
request_queue_size = 200

And the following for nginx configuration (in /etc/nginx/conf.d/SITENAME.conf) :

lua
server {
server_name SITENAME;
root /static;

location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;

client_max_body_size 10m;
client_body_buffer_size 128k;

proxy_connect_timeout 60s;
proxy_send_timeout 90s;
proxy_read_timeout 90s;
proxy_buffering off;
proxy_temp_file_write_size 64k;
proxy_redirect off;

proxy_pass http://unix:/tmp/SITENAME-python.sock;
}

location ~ ^/(img|js|css|ext|theme)/ {
root /home/USERNAME/static;
add_header Cache-Control public;
#expires 30d;
#access_log off;
}
}

In order for the cherrypy server to serve WSGI over a UNIX socket file (rather than a UNIX port) the code needs a small modification (so that socket options aren’t set on the ):

python
# ADD THE FOLLOWING TO PasteScript-1.7.3-py2.7.egg/paste/script/cherrypy_server.py
# Under the line that reads : "bind_addr = (host, int(port))"
if '/' in host:
bind_addr = host

# Under the block (including the lines within it) that reads : "if protocol_version:"
if '/' in host:
server.nodelay=False

As an alternative to the file socket thing, just use the following syntax in the .INI file :

ini
host = 127.0.0.1
port = 6501

and the following in the nginx conf :

lua
proxy_pass 127.0.0.1:6501;


Martin Andrews

{Finance, Software, AI} entrepreneur, living in Singapore with my family.