Apache + Varnish and Nginx

Hi, I have centos server, where both Apache and Nginx are installed already, Varnish is not installed. Now I run Nginx, Apache is stopped (and its config file is not proper now, you should configure it as well). I want you to first install Varnish and configure it to run in front of Apache. I have four websites under /var/www, which are: /var/www/ee /var/www/gonderme /var/www/komsual /var/www/yelloretail You should configure Apache to run these websites without changing the owner and group of the folders, so that it will be easy to switch between nginx and apache. Then you should write a script which accepts a parameter, to control the web servers (apache and nginx). Let's say that the script is called wserver, so it should work like this: wserver nginx It should stop Apache and Varnish if they are running and run Nginx wserver apache It should stop Nginx if it is running, and run Apache only (without Varnish) wserver apache_varnish It should stop Nginx if it is running, and run Apache and Varnish