How to protect sites located on the same hosting account in such a way that hacking one does not affect the rest?

Question

System administration

Let's say there are 3 sites on one account - they hack one of them and get access to the other two - how to prevent this?

Answer 1

If you mean ordinary shared hosting on Linux, then there is one account = one system user, so the answer is no way. The simplest solution is to make an account (system user) for each site.

Answer 2

At a minimum, for each site, the web server should work as a separate user. Well, so that the user from under which the web server is running has rights only to his folder where the site files are located.

Answer 3

Are you asking because you are hosting and are afraid of being hacked? You can't do anything in such a situation. Are you a hosting owner and trying to set it up? Understand Linux, virtualization, containers, selinux ;)