Serving a request from gunicorn

Trying to setup a server on Rackspace.com.

Have done the following things:

Installed Centos 6.3
Installed Python 2.7
Installed gunicorn using the "Quick Start" on their home page: gunicorn.org/

In the quick start, a "hello world" application seems to be initialized:

Create file "myapp.py":

(tutorial) $ vi myapp.py
(tutorial) $ cat myapp.py

Contents of "myapp.py"

def app(environ, start_response):
   data = "Hello, World!\n"
   start_response("200 OK", [
       ("Content-Type", "text/plain"),
       ("Content-Length", str(len(data)))
   ])
   return iter([data])

Since I know very little about servers, I do not know what to do next. I tried typing the server's IP address into the browser, but that seemed to result in a timeout.

I'm not sure if there is:

something else that needs to be installed. Nginx is mentioned under "deploy" on the gunicorn website. Looks like Nginx is a proxy server which is confusing to me because I thought gunicorn was a server. Not sure why I need two servers?
something that needs to be configured in gunicorn
something that needs to be configured on the server itself
something that else entirely that needs to be done in order to actually serve a request

What are the next steps?

Thanks so much!

Solution

looking at the quickstart guide, you probably should have run

(tutorial) $ ../bin/gunicorn -w 4 myapp:app

which should have produced a line that looks a bit like:

Listening at: http://127.0.0.1:8000

Among others. see if you can access your site at that address.

Also Note that 127.0.0.1 is the loopback address; accessible only from that host itself. To get gunicorn to bind to a different option, pass it --bind 0.0.0.0:80, as Jan-Philip suggests.

Since you mention rackspace, its possible that you may need to adjust the firewall settings to allow incoming connections to the desired ports.