How to use 2 ip addresses at once for vps?

Question

Nginx

the provider gave 2 ip in two cities. I sent the site to the SP that is closer geographically to the audience. Although the site also opens on the second ip. But sometimes it lags (in terms of response)
I saw on some sites several ips are used at once. How can you add a second one? Can it help with this ?, so that when he lags on the second switch.

Answer 1

Both Nginx and Apache listen by default on socket address 0.0.0.0 , which, from the point of view of the OS, matches any IP. Unless you specifically set a specific IP that will listen, for example for Nginx:

server {
    listen 192.168.1.1:80;
}

Nginx listen
documentation Apache example: Apache
Listen documentation .
So, if you do not specifically change anything, then the site will be available on all IPs that are delegated to the server.