Serve my website from different server during downtime

Posted by nfedyashev.mp on Server Fault See other posts from Server Fault or by nfedyashev.mp
Published on 2010-05-16T08:34:17Z Indexed on 2010/05/16 8:40 UTC
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I have a VPS server running in the cloud. Fully automated server image upgrade/downgrade(by RAM/HDD plans).

The problem is that server upgrade/downgrade takes time and involves total unavailability during this period(up to 30 minutes).

Goal: during this downtime server my website(http://mydomain.here) from different server with some message like "Under construction".

How can I do this?

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mydomain.here is hosted on godaddy and uses its DNS(If I call it right). It's pointing with A-record to my VPS's IP address now.

Change in these DNS settings will take more than 30minutes, so it's not an option. How can I find mode "dynamic" DNS? What should I learn?

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