How to make a server fault tolerant?

Question

System administration

It's not the first time my site dies ... Each time for different reasons. This time, the hoster was suffocated so that the entire data center collapsed.
I think that it would be necessary to have several copies of the site from different hosts, on different servers. But here the question is how to set everything up.
As I understand it, dns are tied to one hoster, but not to two at once.
It would be cool if it was possible to configure dns as proxying in nginx. (if not this server, then this spare) (wild fantasy)

Answer 1

As I understand it, dns are tied to one hoster, but not to two at once.

https://ru.wikipedia.org/wiki/Round_robin_DNS

Answer 2

Money -> server fail-safe)))

It would be cool if it was possible to configure dns as proxying in nginx. (if not this server, then this spare) (wild fantasy)

All cloud services almost work like this (coffin said).

As I understand it, dns are tied to one hoster, but not to two at once.

Can. How did WikiLeaks work on 280 servers (I think)?
How does Amazon work?
Make your own data center. Do you need it for that kind of money?

Answer 3

You need to raise 3 vps, one of them should be configured as a balancer.

Answer 4

Isn't it easier not to save money and place a site with a normal host?

Answer 5

The question is what is your budget. You can do a lot. And what kind of hoster is this, at which the entire data center is falling?
Maybe you chose the wrong host? Tier III certificates checked at the data center? There should be these three certificate icons https://itsoft.ru/data-center/colocation/#certificates