How to make a DNS redirect when the connection with the server is lost?

Question

Domain Name System

There is a regular domain and 2 servers (both on debian). How to arrange for them to duplicate each other's information, and if one of them fails, all requests are accepted by the other.
PS Links to articles/instructions are welcome.

Answer 1

The whole question is what you want to get, failover or loadbalande. The first is via corosync + pacemaker . The second depends on the type of application, I mean web, then nginx will help you.

Answer 2

so write several nodes A with different addresses.