How to choose virtualization?

Question

Debian

There is a server on which you need to raise several vps, they will host the sites of schools, each vps has its own school, all sites on dle, the average attendance is somewhere around 100-150 bodies per day
How to raise each vps (by hand or programmatically)?
Which virtualization to choose?
what complex solution to choose for automatically raising the vps and then managing it + billing panel (for the time being, I'm leaning towards the ISP System, they have everything for this, but are there any analogues to them?)

Answer 1

At first I wanted to suggest looking in the direction of Proxmox or oVirt, but after reading up to the place where you mention a company whose products I use almost every day, I will try to tip the scales in their direction.
While seemingly free at first glance, the same proxmox will get you good money for integration with billing (from a third-party manufacturer), for updates, support, and the like.
Whereas with ISP systems, all products are easily integrated with each other and they can be considered precisely as a complex solution. https://www.ispsystem.ru/software/vmmanager/comparehere you can view and compare virtualization options. you don't have to look at Cloud =) Given the equal price of VMmanager-OVZ vs VMmanager-KVM, the latter has the advantage that you can install any OS on the guest system. But since it will be DLE, then most likely it will be something Linux-like. For example CentOS. You can look in the direction of openvz virtualization.

Answer 2

For school sites with such attendance, one medium-level vps is enough for you.
fit 10-30 sites depending on vps