2 servers for 2 domain?

Question

ubuntu

Such implementation interests:
There are 2 servers.
On 1 - the main version of the site.
On 2 - additional version (mirror).
2 bases communicate with each other by replication.
When the 1st server crashes, everything is handled by the 2nd and vice versa.
Tell me how to do this? Thank you.

Answer 1

This is called load balancing - a third server is installed that will pull traffic, Nginx is installed on it and a trivial config is prescribed.