Upstart Basic Commands

Disables Nginx so that dpkg does not re-enable it when Nginx is upgraded:

sudo update-rc.d -f nginx disable

Add Nginx to default runlevels:
update-rc.d nginx defaults

Disable Service

sudo sh -c "echo 'manual' > /etc/init/nginx.override"

Manual Service Control
sudo service nginx start

sudo service nginx restart

sudo service nginx stop

Or

sudo start nginx

sudo stop nginx
sudo status nginx


http://askubuntu.com/questions/177041/nginx-disable-autostart