Connecting 2 Server

I have 2 Dedicated Server that I would to connect to each other. One as a primary server and the other one as a backup server. Let say that the ns1.server.net is point to the IP of server 1 and ns2.server.net is point to the server number 2. So when the server 1 is down, there is server 2 that is still online and show the content of the website. Also, the server 2 is keep backup all the data like username, user content and etc. from server 1.

My question is, do you thing it's possible to do this? If yes, please let me know.