How do VPS hosts work?

Question

Virtualization

Here explain, many hosters rent VPS-ki at a price of 3-5 bucks with 1 physical core and a gig of RAM. I tried to calculate - if everything is clear with RAM - you can cram a lot of it, then if you give 1 core to each vps-ke for 3 cu. then the profit from this activity becomes questionable .. At least in my case, considering the costs of colocation, IP addresses for each VPS, etc.
Am I not understanding something? If, after all, they "allegedly" give a core, then how much can VPS really be calculated for 8 cores, for example?

Answer 1

Read about the standard concept of Overselling, https://en.wikipedia.org/wiki/Overselling. In relation to a hoster, it means that he sells much more resources than he really has. In the calculation that not all users will use their cores / gigabytes to the fullest. The greedier the hoster, the more he oversells. Up to terrible brakes with absolutely nothing doing VPS-ke.

Answer 2

When a client comes and says, I need a machine, fast and powerful, the hoster agrees, but warns that the client can use it to the maximum no more, for example, 2 hours a day or as long as you like, but not loading up to 20%. The rest of the time, when one client has no load, the machine will serve another client. Everyone pays $3 for this. And it often happens that there are 10 people per car, but because since all clients work in different conditions and time zones, and there is usually not much load on such servers, then for all sorts of smart things like distribution laws, the server works relatively stably and evenly, although there can be more clients than resources.
In normal mode, the presence of others will be imperceptible, but some kind of ddos ​​on neighboring servers may happen. That's when you can feel the load of neighbors.
VPS - the same shared hosting, but with more independence.

Answer 3

If everyone is loading one hundred percent, then eight vpsok, if everyone is loading five percent, then 160 vpsok

Answer 4

I saw statistics somewhere on disks that, as a rule, about 30% of the allocated space is used on hosting. That is, if in total 100 clients are allocated 100 GB of disks, then about 100 * 100 * 0.3 will actually be used on disks, i.e. ~3 TB.
I won’t say anything about CPU and memory, I didn’t see the data. If you are going to become a hoster, then only the harsh practical reality will tell you how much you can overcommit. Start with a certain size of infrastructure that will allow you to fully accommodate several dozen clients with average tariff plans, and then be guided by how it goes.

Answer 5

I have been using VPS from Amazon and Digital Ocean for almost 4 years now - for myself and many clients. Tariff plans are different - from 1 core to 32x. Some resources are under constant heavy traffic and more or less regular DDoS of various sizes due to the specifics of the projects. And I have never encountered such a thing as overselling or a request to "change the tariff plan" due to the high load. And never once was it indicated anywhere that you can use some 20% of resources for some time - use all 100% of health all the time, as much as you like. This is the meaning of VPS - you pay for the resource and use it without restrictions. If the hoster writes any additional conditions, this is no longer a VPS, but a regular shared one, but with additional options (ssh, etc.).

Answer 6

The whole hosting business is built on the fact that nobody needs services
;)
And we have:
80% of clients do not load the server at all.
Their sites are visited by 1-2 people every other day.
Another 15 percent load the server with 5 requests per day (this is the site owner watching the counter).
Every 20th client pays for 1-2-3 months and does not use the site at all
;)

Answer 7

Вы сможете это определить только на своей практики.
Клиенты могут быть очень и очень разные, с разным профилем нагрузки.
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Но переуплотнение услуг, когда физических ресурсов меньше, чем продаваемых виртуальных - это норма.
Если этого не делать - вы финансово вылетите в трубу.
Только делать это нужно технически грамотно, постоянно мониторя нагрузку (автоматически, разумеется). Тогда ваши клиенты не заметят ничего.