How to host multiple websites on a dedicated server?

Question

Software and Internet Services

There are about 20 sites, php + mysql, the number of unique visitors of each is about 10-15k per day. Now they are scattered around the hosting sites, but the number of visitors is growing, and the load is becoming critical. If you move them all to a dedicated server, then how to place all the sites there. All in one environment or each separately. How it is better to implement it?

Answer 1

it all depends on the sites 10 k per day is great, but there are also factors that are not taken into account.
engine number of goods, etc., etc., cache optimization and query sizes in the database.
Perhaps 1 site will have to be kept on a separate server, and the rest can be collected at least 300 on another.
Physically, they can be easily placed on one server
; practically, you need to look at the sites themselves.

Answer 2

virtualization is our everything

Answer 3

There are about 20 sites, php + mysql, the number of unique visitors of each is about 10-15k per day.

It's about nothing on the load for a typical website.
I only get 4 times more per hour - and it lives perfectly on VDS (and not such a fat VDS, but a modest average rate for resources).
I would redirect the question to programmers - let them see where your jambs are in your code, that a dedicated server is already required for such a meager load.
It just depends on your security requirements.
And your ability to isolate them from each other.