How to minimize the time spent on web server maintenance?

Question

PHP

Hello everyone,
there is a loaded (~ 100 users online) server. It needs to be serviced periodically - to update the database, application software. I would like to cluster it.
There is an nginx proxy server, used as a frontend and standard LAMP architecture (php5-fpm).
What's the easiest way to do it?
Raise another VM separately with mysql and then try clustering on another VM, separately raise an instance similar to Apache, and put the site files with data on NFS?
And on the side of the frontend, organize forwarding requests to different backends?
Sergey.

Answer 1

It is not clear how clustering is related to reduced maintenance costs.