When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa?

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When my A web server gets unplugged, how do I automatically redirect all the users to my B web server in another city, and vice versa?
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ANSWER:

Tell me if you are using any sort of reverse proxy in your environment if so u might be able to redirect it to the backup server.

if not then F5 is a good idea to use.

also if u have register the domain with a 3rd party domain registrar u can get the DNS server config to redirect to new server or backup server.

by Sandeep Shrivastava from http://serverfault.com/questions/383567