nginx: See Active connections / Connections Per Seconds

1. Number of all open connections.
2. Stats about accepted connections.
3. Connections per second and so on.

Configuration

Edit nginx.conf file:
# vi nginx.conf
Add or append the following in context location:

   location /nginx_status {
        # Turn on stats
        stub_status on;
        access_log   off;
        # only allow access from 192.168.1.5 #
        allow 192.168.1.5;
        deny all;
   }

Save and close the file. Reload nginx server:
# service nginx reload
OR
# nginx -s reload

Test it

Open a web-browser and type the following url:
http://your-domain-name-here/nginx_status
OR
http://ip.address.here/nginx_status
Sample outputs:

Fig.01: nginx Status Monitor with HttpStubStatusModule

1. 586 = Number of all open connections
2. 9582571 = Accepted connections
3. 9582571 = Handled connections
4. 21897888 = Handles requests

How do I calculate connections per seconds?

Requests per connection = handles requests / handled connections
Requests per connection = 21897888/9582571 (pass this to bc -l using echo '21897888/9582571' | bc -l command)
Requests per connection = 2.28