VPS/VSD hosting, what kind of hardware, how do they do it?

Question

Iron

There is a tariff "800r / month" which says that two cores are given, 2GB of RAM and 40GB of ssd.
The test showed that this is so, the following question looms, but how many such containers are really running, because placing 6 containers on a typewriter for 200,000 rubles and taking 800 rubles for a month is somehow not reasonable ... and besides all this, rent, electricity and Internet, where will they profit from?

So, on such a machine, a user should be placed 10-100 times more, so that it would bring at least something, but then how does everyone get 2 cores? even if it's 1 core and 1 thread, it still won't work.
It became interesting, I want to read it, but I just didn’t find an article that talks about similar cases .. write to support, they are unlikely to answer.
The Internet network shows that either 100mb is connected there and weighs 5-6 containers, or gigabit, which means there are 50-60 of the same ... But strangely enough, everyone gets what they paid for .. magic is direct.
Or is it like in the cloud, several machines are combined, and resources are summed up .. but not everyone uses them 100%, and whoever does it all the time, so it turns out that you can still cram the same amount, right?
Thanks for the replies, explanations and clarifications.

Answer 1

The same principles by which virtualization works, providers and many many things.
So, we have some server on which the hypervisor is running. Let's assume that it has 64G of memory, and an 8-core processor. As a client virtual machine, we cut 2G of memory and 2 cores. So, it absolutely does not mean that we will not be able to launch no more than 32 machines. In any case, the client virtual machine does not use its resources by 100%, therefore, in fact, the virtual machine will take up as much memory and as much processor resources as the task it performs requires.
Therefore, the number of virtual machines is more than 32. How many exactly - you need to look, in fact, what hosting administrators are doing. In addition, very often in vps tariffs there is a line - the load on the processor is not more than XX%. This is also a limitation.
Similarly, for the width of the channel and for other resources.
From personal experience - at work on a cluster of 10 servers, 180 virtual machines are running. Overselling from memory - about 10 times. And nothing, everything works correctly ...